Materials Scientist
Materials Transformations
Materials Scientist
Materials Transformations


Libor Kovarik is a materials scientist in the Physical Sciences Division at PNNL. He is recognized for his work on applying advanced analytical and in-situ transmission electron microscope methods to study crystallography, structure of surfaces and interfaces, and phase transformations in metals and oxides.

Since joining PNNL, his work has focused predominantly on materials for heterogenous catalysis. Some of his key contributions in this area involve resolving a long-standing issue of crystallographic structure of complex polymorphs of catalytically relevant transition aluminas, as well as resolving the mechanism of their transformations. In addition to catalysis, he works in the area of structural, electronic, radiological, and aerosol materials. He also has a strong interest in development of novel low-dose techniques for electron microscopy imaging and spectroscopy.

Most recently, he developed compressive sensing acquisition techniques and demonstrated its potential for imaging of beam-sensitive materials, which is a key challenge for electron microscopy. He has authored more than 200 publications and has nine patents. He is a member of the Microscopy Society of America and the American Chemical Society. 


  • PhD in Material Science and Engineering, The Ohio State University (2006)
  • MS in Mechanical Engineering, Southern Illinois University (2000)
  • BS and MS in Material Sciences and Engineering, Technical University Ostrava (1997)



  • Khivantsev K., J. Szanyi, N.R. Jaegers, L. Kovarik, F. Gao, Y. Wang. 2021. “High-capacity, low-temperature, passive NOx and cd adsorbers and methods for making same.” U.S. Patent No. 11,071,966.


  • Stanfill B.A, et al. 2020. “Sensing analytical instrument parameters, specimen characteristics, or both from sparse datasets.” U.S. Patent No. 10,541,109.
  • Stevens A.J., L. Kovarik, N.D. Browning. 2020. “Compressive scanning spectroscopy.” U.S. Patent No. 10,580,614.
  • Yu X-Y., L. Kovarik, B.W. Arey. 2020. “Universal liquid sample device and process for high resolution transmission electron microscope imaging and multimodal analyses of liquid sample materials.” U.S. Patent No. 10,598,609.


  • Kovarik L., A.J. Stevens A.V. Liyu, N.D. Browning. 2019. “Sparse sampling methods and probe systems for analytical instruments.” U.S. Patent No. 10,431,419.
  • Stevens A.J., et al. 2019. “Compressive transmission microscopy.” U.S. Patent No. 10,224,175.
  • Stevens A.J., L. Kovarik, N.D. Browning. 2019. “TEM phase contrast imaging with image plane phase grating.” U.S. Patent No. 10,170,274.
  • Stevens A.J., L. Kovarik, A.V. Liyu, N.D. Browning. 2019. “Optimized sub-sampling in an electron microscope.” U.S. Patent No. 10,256,072.


  • Stevens A.J., L. Kovarik, N.D. Browning, A.V. Liyu. 2018. “Electron beam masks for compressive sensors.” U.S. Patent No. 10,109,453.



  • Boglaienko, D., O. Qafoku, R.K. Kukkadapu, L. Kovarik, Y.P. Katsenovich, D.E. Cherkasov, et al. 2021. "Elemental iron: reduction of pertechnetate in the presence of silica and periodicity of precipitated nano-structures." Environmental Science: Nano, 8(1), 97–109. doi: 10.1039/D0EN00897D
  • Cheng, Z., N. Sharma, K.-P. Tseng, L. Kovarik, S. China. 2021. "Direct observation and assessment of phase states of ambient and lab-generated sub-micron particles upon humidification." RSC Advances, 11, 15264–15272. doi: 10.1039/D1RA02530A
  • Cui, Y., J.Z. Chen, B. Peng, L. Kovarik, A. Devaraj, Z.L.J. Au. 2021. "Onset of High Methane Combustion Rates over Supported Palladium Catalysts: From Isolated Pd Cations to PdO Nanoparticles." JACS Au. doi: 10.1021/jacsau.0c00109
  • Dong, Z., G. Deblonde, A. Middleton, D. Hu, A. Dohnalkova, L. Kovarik, et al. 2021. "Microbe-Encapsulated Silica Gel Biosorbents for Selective Extraction of Scandium from Coal Byproducts." Environmental Science and Technology, 55(9), 6320–6328. doi: 10.1021/acs.est.0c08632
  • Ilton, E. S., L. Kovarik, E. Nakouzi, S.T. Mergelsberg, M.E. McBriarty, E.J. Bylaska. 2020. "Using Atom Dynamics to Map the Defect Structure Around an Impurity in Nano-Hematite." The Journal of Physical Chemistry Letters, 10396–10400. doi: 10.1021/acs.jpclett.0c02798
  • Khivantsev, K., N.R. Jaegers, L. Kovarik, M. Wang, J.Z. Hu, Y. Wang, et al. 2021. "The superior hydrothermal stability of Pd/SSZ-39 in low temperature passive NOx adsorption (PNA) and methane combustion." Applied Catalysis B: Environmental, 280, 119449. doi: 10.1016/j.apcatb.2020.119449
  • Khivantsev, K., N.R. Jaegers, J.H. Kwak, J. Szanyi, L. Kovarik. 2021. "Precise identification and characterization of catalytically active sites on the surface of γalumina." Angewandte Chemie International Edition. doi: 10.1002/anie.202102106
  • Khivantsev, K., C.G. Vargas, J. Tian, L. Kovarik, N.R. Jaegers, J. Szanyi, Y. Wang. 2021. "Economizing on Precious Metals in Three-Way Catalysts: Thermally Stable and Highly Active Single-Atom Rhodium on Ceria for NO Abatement under Dry and Industrially Relevant Conditions**." Angewandte Chemie, 133(1), 395–402. doi: 10.1002/ange.202010815
  • Kovarik, L., Bowden, M., & Szanyi, J. 2021. "High temperature transition aluminas in δ-Al2O3/θ-Al2O3 stability range: Review." Journal of Catalysis, 393, 357–368. doi: 10.1016/j.jcat.2020.10.009
  • Li, H., J. Pang, N.R. Jaegers, L. Kovarik, M. Engelhard, A.W. Savoy, et al. 2021. "Conversion of ethanol to 1,3-butadiene over Ag-ZrO2/SiO2 catalysts: The role of surface interfaces." Journal of Energy Chemistry, 54, 7–15. doi: 10.1016/j.jechem.2020.05.038
  • Li, W., M. Taylor, D. Bayerl, S. Mozaffari, M. Dixit, S. Ivanov, et al. 2021. "Solvent manipulation of the pre-reduction metal–ligand complex and particle-ligand binding for controlled synthesis of Pd nanoparticles." Nanoscale, 1–12. doi: 10.1039/d0nr06078j
  • Lin, F., V.L. Dagle, A.D. Winkelman, M. Engelhard, L. Kovarik, Y. Wang, et al. 2021. "Understanding the Deactivation of Ag−ZrO2/SiO2 Catalysts for the Single-step Conversion of Ethanol to Butenes. ChemCatChem, 13(3), 999–1008. doi: 10.1002/cctc.202001488
  • Taylor, S. E., C.I. Pearce, I. Chowdhury, L. Kovarik, I. Leavy, S. Baum, et al. 2020. "Longterm accumulation, depth distribution, and speciation of silver nanoparticles in biosolidsamended soils." Journal of Environmental Quality, 49(6), 1679–1689. doi: 10.1002/jeq2.20156
  • Townsend, L. T., K. Morris, R. Harrison, B. Schacherl, T. Vitova, L. Kovarik, et al. 2021. "Sulfidation of magnetite with incorporated uranium." Ecsn, 130117. doi: 10.1016/j.chemosphere.2021.130117
  • Wang, I.-W., R.A. Dagle, T.S. Khan, J.A. Lopez-Ruiz, L. Kovarik, Y. Jiang, et al. 2021. "Catalytic decomposition of methane into hydrogen and high-value carbons: combined experimental and DFT computational study." Catalysis Science & Technology, 1–11. doi: 10.1039/D1CY00287B
  • Weindl, R., R. Khare, L. Kovarik, A. Jentys, K. Reuter, H. Shi, J.A. Lercher. 2021. "Zeolite-Stabilized Di- and Tetranuclear Molybdenum Sulfide Clusters Form Stable Catalytic Hydrogenation Sites." Angewandte Chemie International Edition, 60(17), 9301–9305. doi: 10.1002/anie.202015769
  • Wu, Y., F. Gao, H. Wang, L. Kovarik, B. Sudduth, Y. Wang. 2021. "Probing Acid-Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions." Journal of Physical Chemistry C, 125(7), 3988–4000. doi: 10.1021/acs.jpcc.0c11107
  • Xu, M., J.A. Lopez-Ruiz, L. Kovarik, et al. 2021. "Structure sensitivity and its effect on methane turnover and carbon co-product selectivity in thermocatalytic decomposition of methane over supported Ni." Applied Catalysis, 611, 117967. doi: 10.1016/j.apcata.2020.117967
  • Zhang, R., M. Athariboroujeny, G. Collinge, V. Iablokov, K.D. Shumilov, L. Kovarik, et al. 2020. "Promoting the Cleavage of C–O Bonds at the Interface between a Metal Oxide Cluster and a Co(0001) Support." ACS Catalysis, 14722–14731. doi: 10.1021/acscatal.0c03205
  • Zhang, X., Y. Lu, L. Kovarik, P. Dasari, D. Nagaki, A.M. Karim. 2021. "Structure sensitivity of n-butane hydrogenolysis on supported Ir catalysts." Journal of Catalysis, 394, 376–386. doi: 10.1016/j.jcat.2020.10.028
  • Zhu, Y., S.F. Yuk, J. Zheng, M.T. Nguyen, M.-S. Lee, J. Szanyi, et al. 2021. "Environment of Metal-O-Fe Bonds Enabling High Activity in CO2Reduction on Single Metal Atoms and on Supported Nanoparticles." Journal of the American Chemical Society, 143(14), 5540–5549. doi: 10.1021/jacs.1c02276


  • Khivantsev K., N.R. Jaegers, I.Z. Koleva, H.A. Aleksandrov, L. Kovarik, M.H. Engelhard, and F. Gao, et al. 2020. "Stabilization of Super Electrophilic Pd+2 Cations in Small-Pore SSZ-13 Zeolite." Journal of Physical Chemistry C 124, no. 1:309-321. PNNL-SA-148282. doi:10.1021/acs.jpcc.9b06760
  • lablokou V.S., S.A. Alekseev, S. Gryn, I. Bezverkhyy, V. Zaitsev, L. Kovarik, and V. de Bocarme, et al. 2020. "Superior Fischer-Tropsch Performance of Uniform Cobalt Nanoparticles Deposited into Mesoporous SiC." Journal of Catalysis 383. PNNL-SA-150647. doi:10.1016/j.jcat.2020.01.028
  • Sabale S.R., D. Barpaga, J. Yao, L. Kovarik, Z. Zhu, S. Chatterjee, and B.P. McGrail, et al. 2020. "Understanding Time Dependence on Zinc Metal-Organic Framework Growth Using In Situ Liquid Secondary Ion Mass Spectrometry." ACS Applied Materials & Interfaces 12, no. 4:5090-5098. PNNL-SA-148177. doi:10.1021/acsami.9b19991


  • Athariboroujeny M., A. Raub, V. Iablokov, S. Chenakin, L. Kovarik, and N.H. Kruse. 2019. "Competing Mechanisms in CO Hydrogenation over Co-MnOx Catalysts." ACS Catalysis 9, no. 6:5603-5612. PNNL-SA-145155. doi:10.1021/acscatal.9b00967
  • Bishop M.E., H. Dong, P. Glasser, B.R. Briggs, M. Pentrak, J.W. Stucki, and M.I. Boyanov, et al. 2019. "Reactivity of Redox Cycled Fe-bearing Subsurface Sediments Towards Hexavalent Chromium Reduction." Geochimica et Cosmochimica Acta 252. PNNL-SA-141702. doi:10.1016/j.gca.2019.02.039
  • Cui W., X. Zhang, C.I. Pearce, Y. Chen, S. Zhang, W. Liu, and M.H. Engelhard, et al. 2019. "Cr(III) adsorption by cluster formation on boehmite nanoplates in highly alkaline solution." Environmental Science & Technology 53, no. 18:11043-11055. PNNL-SA-143650. doi:10.1021/acs.est.9b02693
  • Devaraj A., W. Wang, V.R. Vemuri, L. Kovarik, X. Jiang, M.E. Bowden, and J.R. Trelewicz, et al. 2019. "Grain Boundary Segregation and Intermetallic Precipitation in Coarsening Resistant Nanocrystalline Aluminum Alloys." Acta Materialia 165. PNNL-SA-135423. doi:10.1016/j.actamat.2018.09.038
  • Jaegers N.R., K. Khivantsev, L. Kovarik, D.W. Klas, J.Z. Hu, Y. Wang, and J. Szanyi. 2019. "Catalytic activation of ethylene C-H bonds on uniform d8 Ir(I) and Ni(II) cations in zeolites: toward molecular level understanding of ethylene polymerization on heterogeneous catalysts." Catalysis Science & Technology 9, no. 23:6570-6576. PNNL-SA-148436. doi:10.1039/C9CY01442J
  • Khivantsev K., N.R. Jaegers, L. Kovarik, S. Prodinger, M.A. Derewinski, Y. Wang, and F. Gao, et al. 2019. "Palladium/Beta Zeolite Passive NOx Adsorbers (PNA): Clarification of PNA Chemistry and the Effects of CO and Zeolite Crystallite Size on PNA Performance." Applied Catalysis A: General 569. PNNL-SA-137831. doi:10.1016/j.apcata.2018.10.021
  • Kovarik L., A. Devaraj, C.A. Lavender, and V.V. Joshi. 2019. "Crystallographic and Compositional Analysis of impurity phase: U2MoSi2C in UMo Alloys." Journal of Nuclear Materials 519. PNNL-SA-140234. doi:10.1016/j.jnucmat.2019.03.044
  • Kovarik L., M.E. Bowden, D. Shi, J. Szanyi, and C.H. Peden. 2019. "Structural Intergrowth in delta-Al2O3." Journal of Physical Chemistry C 123, no. 14:9454-9460. PNNL-SA-138049. doi:10.1021/acs.jpcc.8b10135
  • Kunwar D., S. Zhou, A. DelaRiva, E.J. Peterson, H. Xiong, X.I. Pereira Hernandez, and S.C. Purdy, et al. 2019. "Stabilizing High Metal Loadings of Thermally Stable Platinum Single Atoms on an Industrial Catalyst Support." ACS Catalysis 9, no. 5:3978-3990. PNNL-SA-141231. doi:10.1021/acscatal.8b04885
  • Kuo C., Y. Lu, L. Kovarik, M.H. Engelhard, and A.M. Karim. 2019. "Structure Sensitivity of Acetylene Semi-Hydrogenation on Pt Single Atoms and Subnanometer Clusters." ACS Catalysis 9, no. 12:11030-11041. PNNL-SA-144951. doi:10.1021/acscatal.9b02840
  • Liu L., M.L. Sushko, E.C. Buck, X. Zhang, L. Kovarik, Z. Shen, and J. Tao, et al. 2019. "Revisiting the Growth Mechanism of Hierarchical Semiconductor Nanostructures: The Role of Secondary Nucleation in Branch Formation." The Journal of Physical Chemistry Letters10, no. 21:6827-6834. PNNL-SA-147896. doi:10.1021/acs.jpclett.9b02110
  • Lu Y., C. Kuo, L. Kovarik, A.S. Hoffman, A. Boubnov, D.M. Driscoll, and J.R. Morris, et al. 2019. "A Versatile Approach for Quantification of Surface Site Fractions using Reaction Kinetics: The Case of CO Oxidation on Supported Ir Single Atoms and Nanoparticles." Journal of Catalysis 378. PNNL-SA-146617. doi:10.1016/j.jcat.2019.08.023
  • Mehdi B.L., A. Stevens, L. Kovarik, N. Jiang, H.S. Mehta, A.V. Liyu, and S.M. Reehl, et al. 2019. "Controlling the Spatio-Temporal Dose Distribution During STEM Imaging by Subsampled Acquisition: In-Situ Observations of Kinetic Processes in Liquids." Applied Physics Letters 115, no. 6:Article Number 063102. PNNL-SA-145156. doi:10.1063/1.5096595
  • Neill T.S., K. Morris, C. Pearce, L. Abrahamsen-Mills, L. Kovarik, S. Kellet, and B. Rigby, et al. 2019. "Silicate stabilisation of colloidal UO2 produced by uranium metal corrosion." Journal of Nuclear Materials 526. PNNL-SA-146561. doi:10.1016/j.jnucmat.2019.151751
  • Pereira Hernandez X.I., A. DelaRiva, V. Muravev, D. Kunwar, H. Xiong, B.J. Sudduth, and M.H. Engelhard, et al. 2019. "Tuning Pt/CeO2 Interactions By High-temperature Vapor-phase Synthesis For Improved Reducibility of Lattice Oxygen." Nature Communications 10, no. 1:Article number 1358. PNNL-SA-132985. doi:10.1038/s41467-019-09308-5
  • Reilly D.D., M.T. Athon, L. Kovarik, and T.G. Lach. 2019. "Characterization of Slag and Metal from Uranium Bomb Reduction: Morphology, Speciation, and the Search for Thorium." Materials Characterization 158. PNNL-SA-144324. doi:10.1016/j.matchar.2019.109948
  • Saavedra Lopez J., V. Dagle, C.A. Deshmane, L. Kovarik, R.S. Wegeng, and R.A. Dagle. 2019. "Methane and Ethane Steam Reforming over MgAl2O4-Supported Rh and Ir Catalysts: Catalytic Implications for Natural Gas Reforming Application." Catalysts 9, no. 10:Article No. 801. PNNL-SA-146376. doi:10.3390/catal9100801
  • Taylor S.D., J. Liu, X. Zhang, B.W. Arey, L. Kovarik, D.K. Schreiber, and D.E. Perea, et al. 2019. "Visualizing the iron atom exchange front in the Fe(II)-catalyzed recrystallization of goethite by atom probe tomography." Proceedings of the National Academy of Sciences of the United States of America 116, no. 8:2866-2874. PNNL-SA-138345. doi:10.1073/pnas.1816620116
  • Taylor S.D., L. Kovarik, J.B. Cliff, and K.M. Rosso. 2019. "Facet-Selective Adsorption of Fe(II) on Hematite Visualized by Nanoscale Secondary Ion Mass Spectrometry." Environmental Science Nano 6, no. 8:2429-2440. PNNL-SA-144858. doi:10.1039/C9EN00562E


  • Baylon R.A., J. Sun, L. Kovarik, M.H. Engelhard, H. Li, A.D. Winkelman, and K.J. Martin, et al. 2018. "Structural Identification of ZnxZryOz Catalysts for Cascade Aldolization and Self-Deoxygenation Reactions." Applied Catalysis. B, Environmental 234. PNNL-SA-134337. doi:10.1016/j.apcatb.2018.04.051
  • Bhattarai A., K.T. Crampton, A.G. Joly, L. Kovarik, W.P. Hess, and P.Z. El-Khoury. 2018. "Imaging the Optical Fields of Functionalized Silver Nanowires through Molecular TERS." The Journal of Physical Chemistry Letters 9, no. 24:7105-1709. PNNL-SA-139471. doi:10.1021/acs.jpclett.8b03324
  • Dagle V., M.D. Flake, T.L. Lemmon, J. Saavedra Lopez, L. Kovarik, and R.A. Dagle. 2018. "Effect of the SiO2 Support on the Catalytic Performance of Ag/ZrO2/SiO2 Catalysts for the Single-Bed Production of Butadiene from Ethanol." Applied Catalysis. B, Environmental 236. PNNL-SA-128543. doi:10.1016/j.apcatb.2018.05.055
  • Devaraj A., E.J. Kautz, L. Kovarik, S. Jana, N.R. Overman, C.A. Lavender, and V.V. Joshi. 2018. "Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys." Scripta Materialia 156. PNNL-SA-134393. doi:10.1016/j.scriptamat.2018.07.010
  • Devaraj A., L. Kovarik, E.J. Kautz, B.W. Arey, S. Jana, C.A. Lavender, and V.V. Joshi. 2018. "Grain Boundary Engineering to Control the Discontinuous Precipitation in Multicomponent U10Mo Alloy." Acta Materialia 151. PNNL-SA-129167. doi:10.1016/j.actamat.2018.03.039
  • Khivantsev K., F. Gao, L. Kovarik, Y. Wang, and J. Szanyi. 2018. "Molecular Level Understanding of How Oxygen and Carbon Monoxide Improve NOx Storage in Palladium/SSZ-13 Passive NOx Adsorbers: The Role of NO+ and Pd(II)(CO)(NO) Species." Journal of Physical Chemistry C 122, no. 20:10820-10827. PNNL-SA-131978. doi:10.1021/acs.jpcc.8b01007
  • Khivantsev K., N.R. Jaegers, L. Kovarik, J.c. Hanson, F. Tao, Y. Tang, and X. Zhang, et al. 2018. "Achieving Atomic Dispersion of Highly Loaded Transition Metals in Small-pore Zeolite SSZ-13: High-capacity and High-efficiency Low Temperature CO and Passive NOx Adsorbers." Angewandte Chemie International Edition 57, no. 51:16672-16677. PNNL-SA-136340. doi:10.1002/anie.201809343
  • Liu X., H. Dong, X. Yang, L. Kovarik, Y. Chen, and Q. Zeng. 2018. "Effects of Citrate on Hexavalent Chromium Reduction By Structural 1 Fe(II) in Nontronite." Journal of Hazardous Materials 343. PNNL-SA-127651. doi:10.1016/j.jhazmat.2017.09.038
  • Mozaffari S., W. Li, C.B. Thompson, S. Ivanov, S. Seifert, B. Lee, and L. Kovarik, et al. 2018. "Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles." Journal of Visual Experiments 136. PNNL-SA-140505. doi:10.3791/57667
  • Okolie C., Y. Lyu, L. Kovarik, E. Stavitski, and C. Sievers. 2018. "Coupling of Methane to Ethane, Ethylene and Aromatics over Nickel on Ceria-Zirconia at Low Temperatures." ChemCatChem 10, no. 12:2700-2708. PNNL-SA-131737. doi:10.1002/cctc.201701892
  • Prange M.P., X. Zhang, E.S. Ilton, L. Kovarik, M.H. Engelhard, and S.N. Kerisit. 2018. "Electronic Response of Aluminum-Bearing Minerals." Journal of Chemical Physics 149, no. 2:024502. PNNL-SA-132258. doi:10.1063/1.5037104
  • Stevens A.J., L. Luzi, H. Yang, L. Kovarik, B.L. Mehdi, A.V. Liyu, and M. Gehm, et al. 2018. "A Sub-Sampled Approach to Extremely Low-Dose STEM." Applied Physics Letters 112, no. 4:Article No. 043104. PNNL-SA-126577. doi:10.1063/1.5016192
  • Sutherland-Harper S., R. Taylor, J. Hobbs, S. Pimblott, R. Pattrick, M. Sarsfield, and M.A. Denecke, et al. 2018. "Surface speciation and interactions between adsorbed chloride and water on cerium dioxide." Journal of Solid State Chemistry 262. PNNL-SA-128945. doi:10.1016/j.jssc.2018.02.018
  • Varga T., T.C. Droubay, L. Kovarik, D. Hu, and S.A. Chambers. 2018. "Controlling the structure and ferroic properties of strained epitaxial NiTiO3 thin films on sapphire by post-deposition annealing." Thin Solid Films 662. PNNL-SA-129160. doi:10.1016/j.tsf.2018.07.030
  • Voss J., Y. Xiang, G.B. Collinge, D.E. Perea, L. Kovarik, J. McEwen, and N. Kruse. 2018. "Characterization of CoCu- and CoMn-based catalysts for the Fischer Tropsch reaction toward chain-lengthened oxygenates." Topics in Catalysis 61, no. 9-11:1016-1023. PNNL-SA-129636. doi:10.1007/s11244-018-0938-x


  • Davidson S.D., K.A. Spies, D. Mei, L. Kovarik, I.V. Kutnyakov, X.S. Li, and V. Dagle, et al. 2017. "Steam Reforming of Acetic Acid over Co-supported Catalysts: Coupling Ketonization for Greater Stability." ACS Sustainable Chemistry & Engineering 5, no. 10:9136-9149. PNNL-SA-125545. doi:10.1021/acssuschemeng.7b02052
  • Dohnalkova A., B.W. Arey, T. Varga, M.D. Miller, and L. Kovarik. 2017. "Imaging and Analytical Approaches for Characterization of Soil Mineral Weathering." Microscopy and Microanalysis 23, no. S1:2172-2173. PNNL-SA-126363. doi:10.1017/S1431927617011527
  • Jana S., A. Devaraj, L. Kovarik, B.W. Arey, L.E. Sweet, T. Varga, and C.A. Lavender, et al. 2017. "Kinetics of cellular transformation and competing precipitation mechanisms during sub-eutectoid annealing of U10Mo alloys." Journal of Alloys and Compounds 723. PNNL-SA-124502. doi:10.1016/j.jallcom.2017.06.292
  • Jiang W., J. Zhang, L. Kovarik, Z. Zhu, L. Price, J. Gigax, and E. Castanon, et al. 2017. "Irradiation effects and hydrogen behavior in H2+ and He+ implanted gamma-LiAlO2 single crystals." Journal of Nuclear Materials 484. PNNL-SA-114795. doi:10.1016/j.jnucmat.2016.03.014
  • Kautz E.J., A. Devaraj, L. Kovarik, C.A. Lavender, and V.V. Joshi. 2017. Effect of Silicon in U-10Mo Alloy. PNNL-26790. Richland, Washington: Pacific Northwest National Laboratory. 
  • Kovarik L., N.M. Washton, R.K. Kukkadapu, A. Devaraj, A. Wang, Y. Wang, and J. Szanyi, et al. 2017. "Transformation of active sites in Fe/SSZ-13 SCR catalysts during hydrothermal aging: a spectroscopic, microscopic and kinetics study." ACS Catalysis 7, no. 4:2458-2470. PNNL-SA-123026. doi:10.1021/acscatal.6b03679
  • Li W., L. Kovarik, Y. Cheng, L. Nie, M.E. Bowden, J. Liu, and Y. Wang. 2017. "Stabilization and Transformation of Pt Nanocrystals Supported on ZnAl2O4 Spinel." RSC Advances 7, no. 6:3282-3286. PNNL-SA-123052. doi:10.1039/C6RA26159K
  • Li W., L. Nie, Y. Chen, L. Kovarik, J. Liu, and Y. Wang. 2017. "Surface Enrichment of Pt in Stable Pt-Ir Nano-alloy Particles on MgAl2O4 Spinel in oxidizing atmosphere." Catalysis Communications 93. PNNL-SA-123418. doi:10.1016/j.catcom.2017.01.012
  • Mozaffari S., W. Li, C.B. Thompson, S. Ivanov, S. Siefert, B. Lee, and L. Kovarik, et al. 2017. "Colloidal nanoparticle size control: experimental and kinetic modeling investigation of the ligand-metal binding role in controlling the nucleation and growth kinetics." Nanoscale 9, no. 36:13772-13785. PNNL-SA-126850. doi:10.1039/c7nr04101b
  • Okolie C., Y.F. Belhseine, Y. Lyu, M. Yung, M.H. Engelhard, L. Kovarik, and E. Stavitski, et al. 2017. "Conversion of Methane into Methanol and Ethanol over Nickel Oxide on Ceria-Zirconia Catalysts in a Single Reactor." Angewandte Chemie 56, no. 44:13876-13881. PNNL-SA-123257. doi:10.1002/anie.201704704
  • Qafoku O., C.I. Pearce, A. Neumann, L. Kovarik, M. Zhu, E.S. Ilton, and M.E. Bowden, et al. 2017. "Tc(VII) and Cr(VI) Interaction with a Naturally Reduced Ferruginous Smectite from the Redox Transition Zone." Environmental Science & Technology 51, no. 16:9042-9052. PNNL-SA-127378. doi:10.1021/acs.est.7b02191
  • Romano C.A., M. Zhou, Y. Song, V.H. Wysocki, A. Dohnalkova, L. Kovarik, and L. Pasa Tolic, et al. 2017. "Biogenic manganese oxide nanoparticle formation by a multimeric multicopper oxidase Mnx." Nature Communications 8. PNNL-SA-124759. doi:10.1038/s41467-017-00896-8
  • Song J., Y. Wang, E.D. Walter, N.M. Washton, D. Mei, L. Kovarik, and M.H. Engelhard, et al. 2017. "Towards rational design of Cu/SSZ-13 selective catalytic reduction catalysts: Implications from atomic-level understanding of hydrothermal stability." ACS Catalysis 7, no. 12:8214-8227. PNNL-SA-128659. doi:10.1021/acscatal.7b03020
  • Varga T., T.C. Droubay, L. Kovarik, M.I. Nandasiri, V. Shutthanandan, D. Hu, and B. Kim, et al. 2017. "Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO3 Thin Films." ACS Applied Materials & Interfaces 9, no. 26:21879-21890. PNNL-SA-121771. doi:10.1021/acsami.7b04481
  • Xiong H., S. Lin, J.G. Goetze, P. Pletcher, H. Guo, L. Kovarik, and K. Artyushkova, et al. 2017. "Thermally Stable and Regenerable Platinum-Tin Clusters for Propane Dehydrogenation Prepared by Atom Trapping on Ceria." Angewandte Chemie International Edition 56, no. 31:8986-8991. PNNL-SA-126830. doi:10.1002/anie.201701115
  • Xu M., S.L. Riechers, E.S. Ilton, Y. Du, L. Kovarik, T. Varga, and B.W. Arey, et al. 2017. "Manganese-Calcium Intermixing Facilitates Heteroepitaxial Growth at the (10-14) Calcite-Water Interface." Chemical Geology 470. PNNL-SA-125533. doi:10.1016/j.chemgeo.2017.09.001
  • Zheng Y., L. Kovarik, M.H. Engelhard, Y. Wang, Y. Wang, F. Gao, and J. Szanyi. 2017. "Low-Temperature Pd/Zeolite Passive NOx Adsorbers: Structure, Performance and Adsorption Chemistry." Journal of Physical Chemistry C 121, no. 29:15793-15803. PNNL-SA-125868. doi:10.1021/acs.jpcc.7b04312
  • Zhu Y., P.V. Sushko, D. Melzer, E. Jensen, L. Kovarik, C. Ophus, and M. Sanchez-Sanchez, et al. 2017. "Formation of Oxygen Radical Sites on MoVNbTeOx by Cooperative Electron Redistribution." Journal of the American Chemical Society 139, no. 36:12342-12345. PNNL-SA-129307. doi:10.1021/jacs.7b05240


  • Aguiar J.A., S. Wozny, N.R. Alkurd, M. Yang, L. Kovarik, T. Holesinger, and M.M. Al-Jassim, et al. 2016. "Effect of Water Vapor, Temperature, and Rapid Annealing on Formamidinium Lead Triiodide Perovskite Crystallization." ACS Energy Letters 1, no. 1:155-161. PNNL-SA-119094. doi:10.1021/acsenergylett.6b00042
  • China S., B. Wang, J. Weis, L.V. Rizzo, J. Brito, G. Cirino, and L. Kovarik, et al. 2016. "Rupturing of biological spores as a source of secondary particles in Amazonia." Environmental Science & Technology 50, no. 22:12179 - 12186. PNNL-SA-118675. doi:10.1021/acs.est.6b02896
  • Devaraj A., L. Kovarik, V.V. Joshi, S. Jana, S. Manandhar, B.W. Arey, and C.A. Lavender. 2016. High-Resolution Characterization of UMo Alloy Microstructure. PNNL-26020. Richland, Washington: Pacific Northwest National Laboratory. 
  • Kali A., I. Cokic, R. Tang, A. Dohnalkova, L. Kovarik, H. Yang, and A. Kumar, et al. 2016. "Persistent Microvascular Obstruction After Myocardial Infarction Culminates in the Confluence of Ferric Iron Oxide Crystals, Proinflammatory Burden, and Adverse Remodeling." Circulation 9, no. 11:Article No. e004996. PNNL-SA-120886. doi:10.1161/CIRCIMAGING.115.004996
  • Lao D., R.K. Kukkadapu, L. Kovarik, B.W. Arey, D.J. Heldebrant, and S.K. Nune. 2016. "Switchable Ionic Liquids: An Environmentally-friendly Medium to Synthesize Nanoparticulate Green Rust." Current Inorganic Chemistry 6, no. 2:92-99. PNNL-SA-110524. doi:10.2174/1877944106999160317160621
  • Lebarbier V.M., R.A. Dagle, L. Kovarik, A. Genc, Y. Wang, M.E. Bowden, and H. Wan, et al. 2016. "Steam Reforming of Hydrocarbons from Biomass-Derived Syngas over MgAl2O4-Supported Transition Metals and Bimetallic IrNi Catalysts." Applied Catalysis. B, Environmental 184. PNNL-24262. doi:10.1016/j.apcatb.2015.11.022
  • Levitskaia T.G., S. Chatterjee, B.W. Arey, E.L. Campbell, Y. Hong, L. Kovarik, and J.M. Peterson, et al. 2016. "RedOx-Controlled Sorption of Iodine Anions by Hydrotalcite Composites." RSC Advances 6, no. 79:76042-76055. PNNL-SA-115759. doi:10.1039/c6ra13092e
  • Levitskaia T.G., S. Chatterjee, N. Pence, J. Romero, T. Varga, M.H. Engelhard, and Y. Du, et al. 2016. "Inorganic Tin Aluminophosphate Nanocomposite for Reductive Separation of Pertechnetate." Environmental Science: Nano 3, no. 2:1003-1013. PNNL-SA-116229. doi:10.1039/C6EN00130K
  • Muntifering B.R., L. Kovarik, N.D. Browning, R.C. Pond, W.B. Knowlton, and P. Mullner. 2016. "Stress assisted removal of conjugation boundaries in non-modulated Ni-Mn-Ga by coordinated secondary twinning." Journal of Materials Science 51, no. 1:457-466. PNNL-SA-109808. doi:10.1007/s10853-015-9236-1
  • Smith C.D., V.M. Lebarbier, M.D. Flake, K.K. Ramasamy, L. Kovarik, M.E. Bowden, and T. Onfroy, et al. 2016. "Conversion of Syngas-Derived C2+ Mixed Oxygenates to C3-C5 Olefins over ZnxZryOz Mixed Oxides Catalysts." Catalysis Today 6, no. 7:2325-2316. PNNL-SA-111860. doi:10.1039/C5CY01261A
  • Wang B., H.T. Harder, S.T. Kelly, D.Y. Piens, S. China, L. Kovarik, and M. Keiluweit, et al. 2016. "Airborne Soil Organic Particles Generated by Precipitation." Nature Geoscience 9, no. 6:433-438. PNNL-SA-110735. doi:10.1038/NGEO2705
  • Xing R., V.M. Lebarbier, M.D. Flake, L. Kovarik, K.O. Albrecht, C.A. Deshmane, and R.A. Dagle. 2016. "Steam Reforming of Fast Pyrolysis-Derived Aqueous Phase Oxygenates over Co, Ni, and Rh Metals Supported on MgAl2O4." Catalysis Today 269. PNNL-SA-111967. doi:10.1016/j.cattod.2015.11.046


  • Ewbank J.L., L. Kovarik, F.Z. Diallo, and C. Sievers. 2015. "Effect of Metal-Support Interactions in Ni/Al2O3 Catalysts with Low Metal Loading for Methane Dry Reforming." Applied Catalysis. A, General 494. PNNL-SA-107720. doi:10.1016/j.apcata.2015.01.029
  • Felmy A.R., O. Qafoku, B.W. Arey, L. Kovarik, J. Liu, D.E. Perea, and E.S. Ilton. 2015. "Enhancing Magnesite Formation at Low Temperature and High CO2 Pressure: The Impact of Seed Crystals and Minor Components." Chemical Geology 395. PNNL-SA-107559. doi:10.1016/j.chemgeo.2014.12.003
  • Ilton E.S., T.C. Droubay, A.M. Chaka, L. Kovarik, T. Varga, B.W. Arey, and S.N. Kerisit. 2015. "Epitaxial single-crystal thin films of MnxTi1-xO2-d grown on (rutile)TiO2 substrates with pulsed laser deposition: Experiment and theory." Surface Science 632. PNNL-SA-102453. doi:10.1016/j.susc.2014.10.013
  • Jiang W., H. Jung, L. Kovarik, Z. Wang, T.J. Roosendaal, Z. Zhu, and D.J. Edwards, et al. 2015. "Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide." Journal of Nuclear Materials 458. PNNL-SA-105877. doi:10.1016/j.jnucmat.2014.12.071
  • Jiang W., H. Jung, L. Kovarik, Z. Wang, T.J. Roosendaal, Z. Zhu, and D.J. Edwards, et al. 2015. "MAGNESIUM PRECIPITATION AND DIFUSSION IN Mg+ ION IMPLANTED SILICON CARBIDE." In FUSION MATERIALS SEMIANNUAL PROGRESS REPORT FOR THE PERIOD ENDING December 31, 2014, edited by PJ Pappano. 85-86. Oak Ridge, Tennessee:Oak Ridge National Laboratory. PNNL-SA-107486. 
  • Karim A.M., N.M. Al Hasan, S.A. Ivanov, S. Siefert, R.T. Kelly, N.G. Hallfors, and A.D. Benavidez, et al. 2015. "Synthesis of 1 nm Pd Nanoparticles in a Microfluidic Reactor: Insights from in Situ X ray Absorption Fine Structure Spectroscopy and Small-Angle X ray Scattering." Journal of Physical Chemistry C 119, no. 23:13257-13267. PNNL-SA-100863. doi:10.1021/acs.jpcc.5b01681
  • Kovarik L., M.E. Bowden, D. Shi, N.M. Washton, A. Anderson, J.Z. Hu, and J. Lee, et al. 2015. "Unraveling the Origin of Structural Disorder in High Temperature Transition Al2O3: Structure of ?-Al2O3." Chemistry of Materials 27, no. 20:7042-7049. PNNL-SA-111174. doi:10.1021/acs.chemmater.5b02523
  • Li Y., Z. Wei, F. Gao, L. Kovarik, R.A. Baylon, C.H. Peden, and Y. Wang. 2015. "Effect of Oxygen Defects on the Catalytic Performance of VOx/CeO2 Catalysts for Oxidative Dehydrogenation of Methanol." ACS Catalysis 5, no. 5:3006-3012. PNNL-SA-110150. doi:10.1021/cs502084g
  • Perea D.E., I. Arslan, J. Liu, Z. Ristanovic, L. Kovarik, B.W. Arey, and J.A. Lercher, et al. 2015. "Determining the Location and Nearest Neighbors of Aluminum in Zeolites with Atom Probe Tomography." Nature Communications 6. PNNL-SA-106381. doi:10.1038/ncomms8589
  • Stevens A.J., L. Kovarik, P. Abellan, X. Yuan, L. Carin, and N.D. Browning. 2015. "TEM Video Compressive Sensing." Microscopy and Microanalysis 21, no. Suppl 3:1583-1584. PNNL-SA-108164. 
  • Sun J., A.M. Karim, X.S. Li, J.E. Rainbolt, L. Kovarik, Y. Shin, and Y. Wang. 2015. "Hierarchically structured catalysts for cascade and selective steam reforming/hydrodeoxygenation reactions." Chemical Communications 51, no. 93:16617-16620. PNNL-SA-114345. doi:10.1039/C5CC07244A
  • Varga T., T.C. Droubay, M.E. Bowden, L. Kovarik, D. Hu, and S.A. Chambers. 2015. "Strain-dependence Of The Structure And Ferroic Properties Of Epitaxial NiTiO3 Thin Films Grown On Different Substrates." Advances in Condensed Matter Physics 2015. PNNL-SA-110090. doi:10.1155/2015/493045
  • Viswanathan G.B., R. Shi, A. Genc, V.A. Vorontsov, L. Kovarik, C.F. Rae, and M.J. Mills. 2015. "Segregation At Stacking Faults Within The ?' Phase Of Two Ni-base Superalloys Following Intermediate Temperature Creep." Scripta Materialia 94. PNNL-SA-105000. doi:10.1016/j.scriptamat.2014.06.032


  • Bhattacharya P., E.N. Nasybulin, M.H. Engelhard, L. Kovarik, M.E. Bowden, S. Li, and D.J. Gaspar, et al. 2014. "Dendrimer-Encapsulated Ruthenium Nanoparticles as Catalysts for Lithium-O2 Batteries." Advanced Functional Materials 24, no. 47:7510-7519. PNNL-SA-101221. doi:10.1002/adfm.201402701
  • Bishop M.E., P. Glasser, H. Dong, B.W. Arey, and L. Kovarik. 2014. "Reduction And Immobilization Of Hexavalent Chromium By Microbially Reduced Fe-bearing Clay Minerals." Geochimica et Cosmochimica Acta 133. PNNL-SA-101775. doi:10.1016/j.gca.2014.02.040
  • Ewbank J.L., L. Kovarik, C.C. Kenvin, and C. Sievers. 2014. "Effect Of Preparation Methods On The Performance Of Co/Al2O3 Catalysts For Dry Reforming Of Methane." Green Chemistry 16, no. 2:885-896. PNNL-SA-100857. doi:10.1039/c3gc41782d
  • Fan D., R. Anitori, B.M. Tebo, P.G. Tratnyek, J.S. Lezama Pacheco, R.K. Kukkadapu, and L. Kovarik, et al. 2014. "Oxidative Remobilization of Technetium Sequestered by Sulfide-Transformed Nano Zerovalent Iron." Environmental Science & Technology 48, no. 13:7409-7417. PNNL-SA-101920. doi:10.1021/es501607s
  • Jiang W., L. Kovarik, Z. Zhu, T. Varga, M.H. Engelhard, M.E. Bowden, and T.M. Nenoff, et al. 2014. "Microstructure and Cs Behavior of Ba-Doped Aluminosilicate Pollucite Irradiated with F+ Ions." Journal of Physical Chemistry C 118, no. 31:18160-18169. PNNL-SA-102552. doi:10.1021/jp5045223
  • Kovarik L., M.E. Bowden, A. Genc, J. Szanyi, C.H. Peden, and J. Kwak. 2014. "Structure of d-Alumina: Toward The Atomic Level Understanding Of Transition Alumina Phases." Journal of Physical Chemistry C 118. PNNL-SA-100238. doi:10.1021/jp500051j
  • Lebarbier V.M., R.A. Dagle, L. Kovarik, K.O. Albrecht, X.S. Li, L. Li, and C.E. Taylor, et al. 2014. "Sorption-Enhanced Synthetic Natural Gas (SNG) Production from Syngas: A Novel Process Combining CO Methanation, Water-Gas Shift, and CO2 Capture." Applied Catalysis. B, Environmental 144. PNNL-SA-90830. doi:10.1016/j.apcatb.2013.06.034
  • Li W., L. Kovarik, D. Mei, M.H. Engelhard, F. Gao, J. Liu, and Y. Wang, et al. 2014. "A general mechanism for stabilizing the small sizes of precious metal nanoparticles on oxide supports." Chemistry of Materials 26, no. 19:5475-5481. PNNL-SA-95940. doi:10.1021/cm5013203
  • Li Y., Z. Wei, F. Gao, L. Kovarik, C.H. Peden, and Y. Wang. 2014. "Effects of CeO2 Support Facets on VOx/CeO2 Catalysts in Oxidative Dehydrogenation of Methanol." Journal of Catalysis 315, no. 1:15-24. PNNL-SA-102214. doi:10.1016/j.jcat.2014.04.013
  • Mei D., V.A. Glezakou, V.M. Lebarbier, L. Kovarik, H. Wan, K.O. Albrecht, and M.A. Gerber, et al. 2014. "Highly Active and Stable MgAl2O4 Supported Rh and Ir Catalysts for Methane Steam Reforming: A Combined Experimental and Theoretical Study." Journal of Catalysis316. PNNL-SA-99099. doi:10.1016/j.jcat.2014.04.021
  • Muntifering B.R., R.C. Pond, L. Kovarik, N.D. Browning, and P. Muller. 2014. "Intra-variant Substructure in Ni-Mn-Ga Martensite: Conjugation Boundaries." Acta Materialia 71. PNNL-SA-99492. doi:10.1016/j.actamat.2014.03.018
  • Xin H., S. Alayoglu, R. Tao, A. Genc, C.M. Wang, L. Kovarik, and E.A. Stach, et al. 2014. "Revealing the Atomic Restructuring of Pt-Co Nanoparticles." Nano Letters 14, no. 6:3203-3207. PNNL-SA-102970. doi:10.1021/nl500553a
  • Xu M., L. Kovarik, B.W. Arey, A.R. Felmy, K.M. Rosso, and S.N. Kerisit. 2014. "Kinetics and Mechanisms of Cadmium Carbonate Heteroepitaxial Growth at the Calcite (101�4) Surface." Geochimica et Cosmochimica Acta 134. PNNL-SA-96079. doi:10.1016/j.gca.2013.11.036


  • Arey B.W., L. Kovarik, O. Qafoku, Z. Wang, N.J. Hess, and A.R. Felmy. 2013. "Identification of Fragile Microscopic Structures during Mineral Transformations in Wet Supercritical CO2." Microscopy and Microanalysis 19, no. 2:268-275. PNNL-SA-83815. doi:10.1017/S1431927612014171
  • Fan D., R. Anitori, B.M. Tebo, P.G. Tratnyek, J.S. Lezama Pacheco, R.K. Kukkadapu, and M.H. Engelhard, et al. 2013. "Reductive Sequestration Of Pertechnetate (99TcO4-) By Nano Zerovalent Iron (nZVI) Transformed By Abiotic Sulfide." Environmental Science & Technology47, no. 10:5302-5310. PNNL-SA-92126. doi:10.1021/es304829z
  • Genc A., L. Kovarik, M. Gu, H. Cheng, P. Plachinda, L. Pullan, and B. Freitag, et al. 2013. "XEDS STEM Tomography For 3D Chemical Characterization Of Nanoscale Particles." Ultramicroscopy 131. PNNL-SA-94411. doi:10.1016/j.ultramic.2013.03.023
  • Jagielski J., P.A. Jozwik, I. Jozwik Biala, L. Kovarik, B.W. Arey, J. Gaca, and W. Jiang. 2013. "RBS/C, HRTEM and HRXRD study of damage accumulation in irradiated SrTiO3." Radiation Effects and Defects in Solids 168, no. 6:442-449. PNNL-SA-88792. doi:10.1080/10420150.2013.787796
  • Jiang W., L. Kovarik, and T.M. Nenoff. 2013. "Chemical and Charge Imbalance Induced by Radionuclide Decay: Effects on Waste Form Structure." In Separations and Waste Forms Research and Development FY 2013 Accomplishments Report. 122-127. Idaho Falls, Idaho:Idaho National Laboratory. PNNL-SA-99685. 
  • Jozwik Biala I., J.K. Jagielski, B.W. Arey, L. Kovarik, G. Sattonay, A. Debelle, and S. Mylonas, et al. 2013. "Effect of combined local variations in elastic and inelastic energy losses on the morphology of tracks in ion-irradiated materials." Acta Materialia 61, no. 12:4669-4675. PNNL-SA-81738. doi:10.1016/j.actamat.2013.04.037
  • Jozwik P.A., N. Sathish, L. Nowicki, J. Jagielski, A.W. Turos, L. Kovarik, and B.W. Arey, et al. 2013. "Analysis of Crystal Lattice Deformation by Ion Channeling." Acta Physica Polonica. Series A: General Physics, Physics of Condensed Matter, Optics and Quantum Electronics, Atomic and Molecular Physics, Applied Physics 123, no. 5:828-830. PNNL-SA-97219. doi:10.12693/APhysPolA.123.828
  • Kovarik L., A. Genc, C.M. Wang, A. Qiu, C.H. Peden, J. Szanyi, and J. Kwak. 2013. "Tomography and High-Resolution Electron Microscopy Study of Surfaces and Porosity in a Plate-Like ?-Al2O3." Journal of Physical Chemistry C 117, no. 1:179-186. PNNL-SA-89028. doi:10.1021/jp306800h
  • Kwak J., L. Kovarik, and J. Szanyi. 2013. "CO2 Reduction on Supported Ru/Al2O3 Catalysts: Cluster Size Dependence of Product Selectivity." ACS Catalysis 3, no. 11:2449-2455. PNNL-SA-98443. doi:10.1021/cs400381f
  • Kwak J., L. Kovarik, and J. Szanyi. 2013. "Heterogeneous Catalysis on Atomically Dispersed Supported Metals: CO2 Reduction on Multifunctional Pd Catalysts." ACS Catalysis 3, no. 9:2094-2100. PNNL-SA-90666. doi:10.1021/cs4001392
  • Li W., L. Kovarik, D. Mei, J. Liu, Y. Wang, and C.H. Peden. 2013. "Stable platinum nanoparticles on specific MgAl2O4 spinel facets at high temperatures in oxidizing atmospheres." Nature Communications 4. PNNL-SA-92040. doi:10.1038/ncomms3481
  • McCloy J.S., W. Jiang, T.C. Droubay, T. Varga, L. Kovarik, J.A. Sundararajan, and M. Kaur, et al. 2013. "Ion irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties." Journal of Applied Physics 114, no. 8:083903:1-9. PNNL-SA-95858. doi:10.1063/1.4818309
  • Mei D., V.M. Lebarbier, R.J. Rousseau, V.A. Glezakou, K.O. Albrecht, L. Kovarik, and M.D. Flake, et al. 2013. "Comparative Investigation of Benzene Steam Reforming over Spinel Supported Rh and Ir Catalysts." ACS Catalysis 3, no. 6:1133-1143. PNNL-SA-93222. doi:10.1021/cs4000427
  • Sun J., A.M. Karim, H. Zhang, L. Kovarik, X.S. Li, A. Hensley, and J. McEwen, et al. 2013. "Carbon-Supported bimetallic Pd-Fe catalysts for vapor-phase hydrodeoxygenation of guaiacol." Journal of Catalysis 306, no. 1:47-57. PNNL-SA-86936. doi:10.1016/j.jcat.2013.05.020
  • Wang C.M., T.C. Kaspar, V. Shutthanandan, A.G. Joly, L. Kovarik, B.W. Arey, and M. Gu, et al. 2013. "Structure And Radiation Damage Behavior Of Epitaxial CrxMo1-x Alloy Thin Films On MgO." Journal of Nuclear Materials 437, no. 1-3:55-61. PNNL-SA-92123. doi:10.1016/j.jnucmat.2013.01.345
  • Yang F., D.R. Coughlin, P.J. Phillips, L. Yang, A. Devaraj, L. Kovarik, and R.D. Noebe, et al. 2013. "Structure Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf Shape Memory Alloy." Acta Materialia 61, no. 9:3335-3346. PNNL-SA-91683. doi:10.1016/j.actamat.2013.02.023


  • Benavidez A.D., L. Kovarik, A. Genc, N. Agrawal, E.M. Larsson, T.W. Hansen, and A.M. Karim, et al. 2012. "Environmental Transmission Electron Microscopy Study of the Origins of Anomalous Particle Size Distributions in Supported Metal Catalysts." ACS Catalysis 2, no. 11:2349-2356. PNNL-SA-89922. doi:10.1021/cs3005117
  • Brandes M.C., L. Kovarik, M.K. Miller, and M.J. Mills. 2012. "Morphology, structure, and chemistry of nanoclusters in a mechanically alloyed nanostructured ferritic steel." Journal of Materials Science 47, no. 8:3913-3923. PNNL-SA-75316. doi:10.1007/s10853-012-6249-x
  • Ilton E.S., J.S. Lazama Pacheco, J.R. Bargar, J.R. Bargar, Z. Shi, J. Liu, and L. Kovarik, et al. 2012. "Reduction of U(VI) Incorporated in the Structure of Hematite." Environmental Science & Technology 46, no. 17:9428-9436. PNNL-SA-87404. doi:10.1021/es3015502
  • Jiang W., R.M. Van Ginhoven, L. Kovarik, J.E. Jaffe, and B.W. Arey. 2012. "Superlattice Structure and Precipitates in O+ and Zr+ Ion Coimplanted SrTiO3: a Model Waste Form for 90Sr." Journal of Physical Chemistry C 116, no. 31:16709-16715. PNNL-SA-85385. doi:10.1021/jp301343b
  • Jozwik Biala I., J.K. Jagielski, L. Thome, B.W. Arey, L. Kovarik, G. Sattonay, and A. Debelle, et al. 2012. "HRTEM study of track evolution in 120-MeV U irradiated Gd2Ti2O7." Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms 286. PNNL-SA-81728. doi:10.1016/j.nimb.2011.12.040
  • Karim A.M., C.J. Howard, B.Q. Roberts, L. Kovarik, L. Zhang, D.L. King, and Y. Wang. 2012. "In Situ X-ray Absorption Fine Structure Studies on the Effect of pH on Pt Electronic Density during Aqueous Phase Reforming of Glycerol." ACS Catalysis 2, no. 11:2387-2394. PNNL-SA-89904. doi:10.1021/cs3005049
  • Kovarik L., and M.J. Mills. 2012. "Ab Initio Analysis of Guinier-Preston-Bagaryatsky Zone Nucleation in Al-Cu-Mg Alloys." Acta Materialia 60, no. 9:3861-3872. PNNL-SA-86914. doi:10.1016/j.actamat.2012.03.044
  • Kwak J., R.G. Tonkyn, D.N. Tran, D. Mei, S. Cho, L. Kovarik, and J.H. Lee, et al. 2012. "Size-dependent catalytic performance of CuO on ?-Al2O3: NO reduction versus NH3 oxidation." ACS Catalysis 2, no. 7:1432-1440. PNNL-SA-81197. doi:10.1021/cs3002463
  • Lebarbier V.M., R.A. Dagle, L. Kovarik, J.A. Lizarazo Adarme, D.L. King, and D.R. Palo. 2012. "Synthesis of Methanol and Dimethyl Ether from Syngas over Pd/ZnO/Al2O3 Catalysts." Catalysis Science & Technology 2, no. 10:2116-2127. PNNL-SA-85225. doi:10.1039/C2CY20315D
  • Lemmon J.P., E. Polikarpov, W.D. Bennett, and L. Kovarik. 2012. "Thin Metal Oxide Films to Modify a Window Layer in CdTe-Based Solar Cells for Improved Performance." Applied Physics Letters 100, no. 21:Article No, 213908. PNNL-SA-86428. doi:10.1063/1.4722921
  • Peretyazhko T., J.M. Zachara, R.K. Kukkadapu, S.M. Heald, I.V. Kutnyakov, C.T. Resch, and B.W. Arey, et al. 2012. "Pertechnetate (TcO4-) reduction by reactive ferrous iron forms in naturally anoxic, redox transition zone sediments from the Hanford Site, USA." Geochimica et Cosmochimica Acta 92. PNNL-SA-84692. 
  • Phillips P.J., M. De Graef, L. Kovarik, A. Agrawal, W. Windl, and M.J. Mills. 2012. "Atomic-resolution defect contrast in low angle annular dark-field STEM." Ultramicroscopy 116. PNNL-SA-80284. doi:10.1016/j.ultramic.2012.03.013
  • Qafoku O., L. Kovarik, R.K. Kukkadapu, E.S. Ilton, B.W. Arey, J. Tucek, and A.R. Felmy. 2012. "Fayalite Dissolution and Siderite Formation in Water-Saturated Supercritical CO2." Chemical Geology 332-333. PNNL-SA-90841. doi:10.1016/j.chemgeo.2012.09.028
  • Rajachidambaram M., T. Varga, L. Kovarik, R.P. Sanghavi, V. Shutthanandan, S. Thevuthasan, and S. Han, et al. 2012. "Formation of zinc oxide films using submicron zinc particle dispersions." Journal of Vacuum Science and Technology B--Microelectronics and Nanometer Structures 30, no. 4:Article No. 041805. PNNL-SA-88467. doi:10.1116/1.4731255
  • Vorontsov V.A., L. Kovarik, M.J. Mills, and C. Rae. 2012. "High Resolution Electron Microscopy Of Dislocation Ribbons In A CMSX-4 Superalloy single crystal." Acta Materialia60, no. 12:4673-4996. PNNL-SA-87981. doi:10.1016/j.actamat.2012.05.014
  • Wang C.M., X. Li, Z. Wang, W. Xu, J. Liu, F. Gao, and L. Kovarik, et al. 2012. "In Situ TEM Investigation of Congruent Phase Transition and Structural Evolution of Nanostructured Silicon/Carbon Anode for Lithium Ion Batteries." Nano Letters 12, no. 3:1624-1632. PNNL-SA-84904. doi:10.1021/nl204559u
  • Wu T., D. Childers, C. Gomez, A.M. Karim, N. Schweitzer, A. Kropf, and H. Wang, et al. 2012. "General Method for Determination of the Surface Composition in Bimetallic Nanoparticle Catalysts from the L Edge X-ray Absorption Near-Edge Spectra." ACS Catalysis 2, no. 11:2433-2443. PNNL-SA-89152. doi:10.1021/cs3004566
  • Xiao J., X. Chen, P.V. Sushko, M.L. Sushko, L. Kovarik, J. Feng, and Z. Deng, et al. 2012. "High-Performance LiNi0.5Mn1.5O4 Spinel Controlled by Mn3+ Concentration and Site Disorder." Advanced Materials 24, no. 16:2109-2116. PNNL-SA-84168. doi:10.1002/adma.201104767
  • Xiao L., Y. Cao, J. Xiao, W. Wang, L. Kovarik, Z. Nie, and J. Liu. 2012. "High capacity, reversible alloying reactions in SnSb/C nanocomposites for Na-ion battery applications." Chemical Communications 48, no. 27:3321-3323. PNNL-SA-85851. doi:10.1039/C2CC17129E
  • Yang F., L. Kovarik, P.J. Phillips, R.D. Noebe, and M.J. Mills. 2012. "Characterizations Of Precipitate Phases In a Ti-Ni-Pd Alloy." Scripta Materialia 67, no. 2:145-148. PNNL-SA-87982. doi:10.1016/j.scriptamat.2012.04.003
  • Zheng J., J. Xiao, X. Yu, L. Kovarik, M. Gu, F. Omenya, and X. Chen, et al. 2012. "Enhanced Li+ ion transport in LiNi0.5Mn1.5O4 through Control of Site Disorder." Physical Chemistry Chemical Physics. PCCP 14, no. 39:13515-13521. PNNL-SA-88177. 


  • Arey B.W., L. Kovarik, Z. Wang, and A.R. Felmy. 2011. "Investigation of Mineral Transformations in Wet Supercritical CO2 by Electron Microscopy." Microscopy and Microanalysis 17, no. Suppl S2:1928-1929. PNNL-SA-81736. doi:10.1017/S1431927611010518
  • Bowker R.H., M.C. Smith, M. Pease, K.M. Slenkamp, L. Kovarik, and M.E. Bussell. 2011. "Synthesis and Hydrodeoxygenation Properties of Ruthenium Phosphide Catalysts." ACS Catalysis 1, no. 8:917-922. PNNL-SA-80947. doi:10.1021/cs200238v
  • Kovarik L., and M.J. Mills. 2011. "Structural Relationship Between One-Dimensional Crystals of Guinier-Preston-Bagaryatsky Zones in Al-Cu-Mg Alloys." Scripta Materialia 64, no. 11:999-1002. PNNL-SA-76716. doi:10.1016/j.scriptamat.2011.01.033
  • Lea A.S., B.C. Kabius, B.W. Arey, L. Kovarik, C.M. Wang, G. Orr, and I. Lyubinetsky, et al. 2011. "Quietly Building Capabilities: New Instruments, Expertise, "Quiet Wing" Available at DOE User Facility." Microscopy Today 19, no. 5:48-53. PNNL-SA-81095. doi:10.1017/S1551929511000964
  • Sanghavi R.P., R. Devanathan, M.I. Nandasiri, S.N. Kuchibhatla, L. Kovarik, S. Thevuthasan, and S. Prasad. 2011. "Integrated experimental and modeling study of the ionic conductivity of samaria-doped ceria thin films." Solid State Ionics 204-205. PNNL-SA-76714. doi:10.1016/j.ssi.2011.10.007
  • Unocic R.R., N. Zhou, L. Kovarik, C. Shen, Y. Wang, and M.J. Mills. 2011. "Dislocation decorrelation and relationship to deformation microtwins during creep of a y' precipitate strengthened Ni-based superalloy." Acta Materialia 59, no. 19:7325-7339. PNNL-SA-79523. doi:10.1016/j.actamat.2011.07.069