Materials Scientist
Materials Scientist


Tamas Varga leads the Biogeochemical Transformations team within the Environmental Transformations and Interactions group in PNNL’s Environmental Molecular Sciences Division and the Environmental Molecular Sciences Laboratory (EMSL) user program. He has been a senior research scientist in the Environmental and Molecular Sciences Laboratory (EMSL) since 2009. He received his PhD in chemistry in 2005 from Georgia Institute of Technology following his MS in chemistry from the University of Debrecen, and MS in economics from the University of Miskolc, both in Hungary.  

Before PNNL, he spent his postdoctoral years at the University of California, Davis (2005-2007) and Argonne National Laboratory (2007-2009). He supports the X-ray diffraction (XRD) and X-ray computed tomography (XCT) user program at EMSL, maintains the XRD and XCT facilities in part, and develops his own research program utilizing EMSL's capabilities and those at other national user facilities for collaborative research. As part of user support, he performs XRD characterization of various types of samples (powder, thin film, etc.), and XCT imaging of a range of materials (biological, geological, etc.).  

He has published over 110 journal articles, a book chapter, and given several invited talks at conferences and research institutions. He has also been active in scientific editing, conference chairing, proposal review panels in the materials science and synchrotron science areas, and mentoring the younger generation in science. 

Research Interest

  • Application of X-ray imaging and spectroscopy methods to studies of biological, geological, and other materials and problems 

  • Connecting microstructural and chemical information to investigate structure-property relationships in materials 


  • PhD in Chemistry, Georgia Institute of Technology, 2005 

  • MS in Chemistry, University of Debrecen, 1995 

  • MS in Economics, University of Miskolc, 1999 

Affiliations and Professional Service

  • Editorial Board Member, Materials Journal (2020-Present) 

  • Contributing Editor, Phase Equilibria Diagrams, National Institute of Standards and Technology/American Ceramic Society (2007 – Present) 

Awards and Recognitions

  • Outstanding Performance Award, Physical and Computational Sciences Directorate, PNNL (2017) 

  • Of The Year Award, Energy and Environment Directorate, PNNL (2016) 

  • Scientist and Engineer Development Program, PNNL (2011)



B. J. Riley, S. Chong, W. Kuang, T. Varga, A. S. Helal, M. Galanek, J. Li, Z. J. Nelson, P. K. Thallapally, "Metal-organic framework-polyacrylonitrile composite beads for xenon capture."  ACS Applied Materials & Interfaces, 12(40), 45342−45350 (2020) 

S. A. Saslow, S. N. Kerisit, T. Varga, S. T. Mergelsberg, C. Corkhill, M. M. V. Snyder, N. Avalos, A. S. Yorkshire, D. J. Bailey, J. Crum, R. M. Asmussen, “Immobilizing Pertechnetate in Ettringite via Sulfate Substitution”, Environmental Science & Technology (2020) 

W. Jiang, S. R. Spurgeon, B. E. Matthews, A. K. Battu, S. China, T. Varga, A. Devaraj, E. J. Kautz, M. A. Marcus, D. D. Reilly, W. G. Luscher, “Carbonaceous deposits on aluminide coatings in tritium-producing assemblies”, Nuclear Materials and Energy, 100797 (2020) 

S. E. Yalcin, J. P. O’Brien, Y. Gu, K. Reiss, M. Y. Sophia, R. Jain, V. Srikanth, P. J Dahl, W. Huynh, D. Vu, A. Acharya, S. Chaudhuri, T. Varga, V. S. Batista, N. S. Malvankar, “Electric field stimulates production of highly conductive microbial OmcZ nanowires”, Nature Chemical Biology, 16(10), 1136-1142 (2020) 

A. K. Battu, T. R. Pope, T. Varga, J. F Christ, M. D Fenn, W. S. Rosenthal, W. Kuang, M. Thomas, A. M. Arnold, M. Schram, M. G. Warner, C. A. Barrett, Z. C. Kennedy, “Build orientation dependent microstructure in polymer laser sintering: Relationship to part performance and evolution with aging”, Additive Manufacturing, 36, 101464 (2020) 

F. Luzi., M. D. Fenn, J. F. Christ, Z. C. Kennedy, T. Varga, M. S. Hughes, C. M. Ortiz Marrero, "Application of Entropy and Signal Energy for Ultrasound-Based Classification of 3D Printed Polyetherketoneketone Components", The Journal of the Acoustical Society of America, 148, 292 (2020) 

S. Chatterjee, M. S. Fujimoto, N. L. Canfield, M. R. Elmore, T. Varga, D. J. Senor, "Probing the radial chemistry of getter components in light water reactors via controlled electrochemical dissolution", ACS Omega, 5(23) 13578–13587 (2020) 

K. A. Rod, J. K. Iyer, C. E. Lonergan, T. Varga, K. J. Cantrell, L.R. Reno, "Geochemical narrowing of cement fracture aperture during multiphase flow of supercritical CO2 and brine", International Journal of Greenhouse Gas Control, 95, 102978 (2020) 

R. M. Boiteau, R.K. Kukkadapu, C.R. Smallwood, J.B. Cliff, L. Kovarik, M.G. Wirth, M.H. Engelhard, T. Varga, A. C. Dohnalkova, D. E. Perea, T. Wietsma, J. J. Moran, K. S. Hofmockel, "Calcareous coatings sequester organic matter and siderophores in alkaline soils" Science of the Total Environment, 724, 138250 (2020) 

S.A. Luksic, R. Pokorny, J.L. George, P.R. Hrma, T. Varga, L.R. Reno, A.C. Buchko, A. A. Kruger, "In-situ characterization of foam morphology during melting of simulated waste glass using X-ray Computed Tomography." Ceramics International, 46(11), 17176–17185 (2020) 

A. Wang, Y. Chen, E. D. Walter, N. M. Washton, T. Varga, Y. Wang, J. Szanyi, Y. Wang, C. H. F. Peden, F. Gao, “Remarkable self-degradation of Cu/SAPO-34 selective catalytic reduction catalysts during storage at ambient conditions”, Catalysis Today (2020) 

K. A. Rod, C. A. Fernandez, M.-T. Nguyen, J. B. Gardiner, N. J. Huerta, V.-A. Glezakou, T. Varga, R. Rousseau, P. K. Koech, “Polymer-cement composites with adhesion and re-adhesion (healing) to casing capability for geothermal wellbore applications”, Cement and Concrete Composites, 107, 103490 (2020).

J. Kang, T. G. Levitskaia, S. Park, J. Kim, T. Varga, W. Um, “Nanostructured MgFe and CoCr layered double hydroxides for removal and sequestration of iodine anions”, Chemical Engineering Journal, 380, 122408 (2020) 


S. China, S. Colby, A. K. Battu, T. Varga, “Machine Learning Approaches for Analysis of Multiscale Imaging Data for Atmospheric and Soil Particles”, Microscopy and Microanalysis, 25 (S2), 194-195 (2019) 

S. A. Saslow, S. N. Kerisit, T. Varga, K. C. Johnson, N. M. Avalos, A. R. Lawter, N. P. Qafoku, “Chromate Effect on Iodate Incorporation into Calcite”, ACS Earth and Space Chemistry, 3 (8), 1624-1630 (2019) 

S. A. Whalen, N. R. Overman, V. V. Joshi, T. Varga, D. D. Graff, C. A. Lavender, “Magnesium alloy ZK60 tubing made by Shear Assisted Processing and Extrusion (ShAPE)”, Journal of Materials Science and Engineering A, 755, 278-288 (2019) 

K. K. M. B. B. Adikaram, W. G. C. Kumarage, T. Varga, B. S. Dassanayake, “Improvement of the photo-activity of CdS thin films using TX-100”, Journal of Electronic Materials, 48 (7), 4424-4431 (2019) 

A. Wang, Y. Chen, E. D. Walter, N. M. Washton, D. Mei, T. Varga, Y. Wang, J. Szanyi, Y. Wang, C. H. F. Peden, F. Gao, “Unraveling the mysterious failure of Cu/SAPO-34 selective catalytic reduction (SCR) catalysts”, Nature Communications, 10 (1), 1137 (2019) 

K. A Rod, M.-T. Nguyen, M. Elbakhshwan, S. Gills, B. Kutchko, T. Varga, A. M. Mckinney, T. J. Roosendaal, M. I. Childers, C. Zhao, Y. K. Chen-Wiegart, J. Thieme, P. K. Koech, W. Um, J. Chun, R. Rousseau, V.-A. Glezakou, C. A. Fernandez, “Insights into the physical and chemical properties of a cement-polymer composite developed for geothermal wellbore applications”, Cement and Concrete Composites, 97, 279-287 (2019) 

S. Chatterjee, M. S. Fujimoto, N. L. Canfield, M. R. Elmore, D. W. Olson, E. C. Buck, M. A. Conroy, T. Varga, D. J. Senor, “An electrochemical technique for controlled dissolution of zirconium based components of light water reactors”, RSC Advances, 9 (4), 1869-1881 (2019) 


T. Wanzek, M. Keiluweit, T. Varga, A. Lindsley, P. S. Nico, S. Fendorf, M. Kleber, “The Ability of Soil Pore Network Metrics to Predict Redox Dynamics is Scale Dependent”, Soil Systems, 2 (4), 666 (2018) 

I. E. Johnson, S. Chatterjee, G. B. Hall, S. D. Burton, E. L. Campbell, M. A.  Conroy, Y. Du, M. S. Fujimoto, T. Varga, A. A. Kruger, T. G. Levitskaia, “Inorganic Ba–Sn nanocomposite materials for sulfate sequestration from complex aqueous solutions”, Environmental Science: Nano, 5, 890-903 (2018) 

B. S. Dassanayake, C. P. Jayalath, V. Seneviratne, W. G. C. Kumarage, T. Varga, R. Wijesundera, “Optical, structural and photo electrochemical properties of Cd1−xZnxS films grown by chemical bath deposition”, Applied Physics A: Materials Science and Processing, 124 (7), 494 (2018) 

T. Varga, T. C. Droubay, L. Kovarik, D. Hu, S. A. Chambers, “Controlling the Structure and Ferroic Properties of Strained Epitaxial NiTiO3 Thin Films on Sapphire by Post-Deposition Annealing”, Thin Solid Films, 662, 47–53 (2018) 

J. Szanyi, D. Mei, T. Varga, C. H. F. Peden, I. Heo, S. Oh, C. H. Kim, “Where does the sulphur go? Deactivation of a low temperature CO oxidation catalyst by sulphur poisoning”, Catalysis Letters, 148 (5), 1445-1450 (2018) 

K. H. L. Zhang, G. Li, S. R. Spurgeon, L. Wang, P. Yan, Z. Wang, M. Gu, T. Varga, M. E. Bowden, Z. Zhu, C. Wang, Y. Du, “Creation and Ordering of Oxygen Vacancies at WO3-d and Perovskite Interfaces”, ACS Applied Materials & Interfaces, 10 (20), 17480-17486 (2018) 

J. L. Weaver, C. I. Pearce, R. Sjöblom, J. S. McCloy, M. Miller, T. Varga, B. W. Arey, M. A. Conroy, D. K. Peeler, R. J. Koestler, P. T. DePriest, E. P. Vicenzi, E. Hjärthner‐Holdar, E. Ogenhall, A. A. Kruger, “Pre‐viking Swedish hillfort glass: A prospective long‐term alteration analogue for vitrified nuclear waste”, International Journal of Applied Glass Science, 1-15 (2018) 

T. C. Kaspar, S. Hong, M. E. Bowden, T. Varga, P. Yan, C. Wang, S. R. Spurgeon, R. B. Comes, P. Ramuhalli, C. H. Henager, “Tuning piezoelectric properties through epitaxy of La2Ti2O7 and related thin films”, Scientific Reports, 8 (1), 3037 (2018) 

H. Shao, S. Kabilan, S. Stephens, N. Suresh, A. N. Beck, T. Varga, P. F. Martin, A. Kuprat, H. B. Jung, W. Um, A. Bonneville, D. J. Heldebrant, K. C. Carroll, J. Moore, C. A Fernandez, Corrigendum to “Environmentally friendly, rheoreversible, hydraulic-fracturing fluids for enhanced geothermal systems”, Geothermics, 72, 323-325 (2018) 


S. Jana, N. Overman, T. Varga, C. Lavender, V. V. Joshi, “Phase transformation kinetics in rolled U-10 wt.% Mo foil: Effect of post-rolling heat treatment and prior γ-UMo grain size”, Journal of Nuclear Materials, 496C, 215-226 (2017) 

M. Xu, S. L. Riechers, E. S. Ilton, Y. Du, L. Kovarik, T. Varga, B. W. Arey, O. Qafoku, S. Kerisit, “Manganese-calcium intermixing facilitates heteroepitaxial growth at the (1014) calcite-water interface”, Chemical Geology, 470, 152-163 (2017) 

A. C. Dohnalkova, M. M. Tfaily, A. P. Smith, R. K. Chu, A. R. Crump, C. J. Brislawn, T. Varga, Z. Shi, L. S. Thomashow, J. B. Harsh, C. K. Keller, “Molecular and Microscopic Insights into the Formation of Soil Organic Matter in a Red Pine Rhizosphere”, Soils, 1 (1), 4 (2017) 

A. Dohnalkova, B. Arey, T. Varga, M. Miller, L. Kovarik, “Imaging and Analytical Approaches for Characterization of Soil Mineral Weathering”, Microscopy and Microanalysis, 23 (S1), 2172-2173 (2017) 

S. Jana, A. Devaraj, L. Kovarik, B. Arey, L. Sweet, T. Varga, C. Lavender, V. Joshi, “Kinetics of cellular transformation and competing precipitation mechanisms during sub-eutectoid annealing of U10Mo alloys”, Journal of Alloys and Compounds, 723, 757-771 (2017) 

W. G. C. Kumarage, R. P. Wijesundera, V. A. Seneviratne, C. P. Jayalath, T. Varga, M. I. Nandasiri, B. S. Dassanayake, “Growth and Characterization of EDTA Assisted CBD-CdS”, Materials Chemistry and Physics, 200, 1-8 (2017) 

J. Zheng, R. S. Vemuri, L. Estevez, P. K. Koech, T. Varga, D. M. Camaioni, T. A. Blake, B. P. McGrail, R. K. Motkuri, “Pore-engineered metal-organic frameworks with excellent adsorption of water and fluorocarbon refrigerant for cooling applications”, Journal of the American Chemical Society, 139 (31), 10601-10604 (2017) 

T. Varga, T. C. Droubay, L. Kovarik, M. I. Nandasiri, V. Shutthanandan, D. Hu, B. Kim, S. Jeon, S. Hong, Y. Li, S. A. Chambers, “Coupled Lattice Polarization and Ferromagnetism in Strained Epitaxial NiTiO3 Thin Films”, ACS Applied Materials & Interfaces 9, 21879−21890 (2017) 

X. Yang, T. Varga, C. Liu, T. D. Scheibe, “What can we learn from in-soil imaging of a live plant: X-ray Computed Tomography and 3D numerical simulation of root-soil system”, Rhizosphere, 3, 259–262 (2017) 

T. C. Kaspar, J. G. Gigax, L. Shao, M. E. Bowden, T. Varga, V. Shutthanandan, S. R. Spurgeon, P. Yan, C. Wang, P. Ramuhalli, C. H. Henager, “Damage evolution of ion irradiated defected-fluorite La2Zr2O7 epitaxial thin films”, Acta Materialia, 130, 111-120 (2017) 


A. L. McKinney, T. Varga, “Quantitative analysis of three-dimensional branching systems from x-ray computed microtomography data”, Imaging in Medicine, 8 (4), 97-98 (2016) 

Y. Choi, X. Jiang, W. Bi, P. Lapa, R. K. Chouhan, D. Paudyal, T. Varga, D. Popov, J. Cui, D.  Haskel, J. S. Jiang, “Element resolved magnetism across the temperature- and pressure-induced spin reorientation in MnBi”, Physical Review B, 94, 184433 (2016) 

D. I. Kaplan, R. Kukkadapu, J. C. Seaman, B. W. Arey, A. C. Dohnalkova, S. Buettner, D. Li, T. Varga, K. G. Scheckel, P. R. Jaffe, “Iron mineralogy and uranium-binding environment in the rhizosphere of a wetland soil”, Science of The Total Environment, 569-570, 53-64 (2016) 

S. Kabilan, H. B. Jung, A. P. Kuprat, A. N. Beck, T. Varga, C. A. Fernandez, W. Um, “Numerical Simulation of Permeability Change in Wellbore Cement Fractures after Geomechanical Stress and Geochemical Reactions using X-ray Computed Tomography Imaging”, Environmental Science & Technology, 50 (12), 6180-6188 (2016) 

N. Suresh, S. A. Stephens, L. Adams, A. N. Beck, A. L. McKinney, T. Varga, “Extracting Metrics for Three-dimensional Root Systems: Volume and Surface Analysis from In-soil X-ray Computed Tomography Data”, JoVE (Journal of Visualized Experiments), 110, e53788-e53788 (2016) 

T. G. Levitskaia, S. Chatterjee, B. W. Arey, E. L. Campbell, Y. Hong, L. Kovarik, J. M. Peterson, N. K. Pence, J. Romero, V. Shutthanandan, B. Schwenzer, T. Varga, “RedOx-controlled sorption of iodine anions by hydrotalcite composites”, RSC Advances, 6 (79), 76042-76055 (2016) 

T. G. Levitskaia, S. Chatterjee, N. K. Pence, J. Romero, T. Varga, M. H. Engelhard, Y. Du, L. Kovarik, B. W. Arey, M. E. Bowden, E. D. Walter, “Inorganic tin aluminophosphate nanocomposite for reductive separation of pertechnetate”, Environmental Science: Nano, 3, 1003-1013 (2016) 

S. Prodinger, R. S. Vemuri, T. Varga, B. P. McGrail, R. K. Motkuri, M. A. Derewinski, “Impact of chabazite SSZ-13 textural properties and chemical composition on CO2 adsorption applications”, New Journal of Chemistry, 40 (5), 4375-4385 (2016) 

L. Zhang, W. Jiang, A. Dissanayake, T. Varga, J. Zhang, Z. Zhu, D. Hu, H. Wang, C. Henager, T. Wang, “Grain growth of nanocrystalline 3C-SiC under Au ion irradiation at elevated temperatures”, Journal of Physics D: Applied Physics, 49, 035304 (2016) 


Y. Liu, C. Liu, R. Kukkadapu, J. McKinley, J. Zachara, A. Plymale, M. Miller, T. Varga, C. Resch, “Tc-99(VII) Retardation, Reduction, and Redox Rate Scaling in Naturally Reduced Sediments”, Environmental Science & Technology, 49 (22), 13403-13412 (2015) 

H. Shao, S. Kabilan, S. Stephens, N. Suresh, A. N. Beck, T. Varga, P. F. Martin, “Environmentally friendly, rheoreversible, hydraulic-fracturing fluids for enhanced geothermal systems”, Geothermics, 58, 22-31 (2015) 

T. Varga, T. C. Droubay, M. E. Bowden, L. Kovarik, D. Hu, S. A. Chambers, “Strain-dependence of the structure and ferroic properties of epitaxial NiTiO3 thin films grown on different substrates”, Advances in Condensed Matter Physics, 2015, 493045, 1-9, (2015) 

W. Jiang, C. H. Henager, T. Varga, H. J. Jung, N. R. Overman, C. Zhang, J. Gou, “Diffusion of Ag, Au and Cs implants in MAX phase Ti3SiC2”, Journal of Nuclear Materials, 462, 310-320 (2015) 

G. Kulkarni, M. Nandasiri, A. Zelenyuk, J. Beranek, N. Madaan, A. Devaraj, V. Shutthanandan, S. Thevuthasan, T. Varga, “Effects of crystallographic properties on the ice nucleation properties of volcanic ash particles”, Geophysical Research Letters, 42 (8), 3048-3055 (2015) 

T. Varga, T. C. Droubay, M. E. Bowden, S. A. Stephens, S. Manandhar, et al., “Strain-dependence of the structure and ferroic properties of epitaxial Ni1−xTi1−yO3 thin films grown on sapphire substrates”, Thin Solid Films, 578, 113-123 (2015) 

B. T. Flynn, K. H. L. Zhang, V. Shutthanandan, T. Varga, R. J. Colby, R. P. Oleksak, et al., “Growth and surface modification of LaFeO3 thin films induced by reductive annealing”, Applied Surface Science, 330, 309-315 (2015) 

E. S. Ilton, T. C. Droubay, A. M. Chaka, L. Kovarik, T. Varga, B. W. Arey, S. N. Kerisit, “Epitaxial single-crystal thin films of MnxTi1−xO2−δ grown on (rutile) TiO2 substrates with pulsed laser deposition: Experiment and theory”, Surface Science, 632, 185-194 (2015) 

G. Li, T. Varga, P. Yan, Z. Wang, C. Wang, S. A. Chambers, Y. Du, “Crystallographic dependence of photocatalytic activity of WO3 thin films prepared by molecular beam epitaxy”, Physical Chemistry Chemical Physics, 17 (23), 15120-15123 (2015) 

H. B. Jung, K. C. Carroll, S. Kabilan, D. J. Heldebrant, D. Hoyt, L. Zhong, T. Varga, et al., “Stimuli-responsive/rheoreversible hydraulic fracturing fluids as a greener alternative to support geothermal and fossil energy production”, Green Chemistry, 17 (5), 2799-2812 (2015) 


W. Jiang, J. A. Sundararajan, T. Varga, M. E. Bowden, Y. Qiang, J. S. McCloy, et al., “In Situ Study of Nanostructure and Electrical Resistance of Nanocluster Films Irradiated with Ion Beams”, Advanced Functional Materials, 24 (39), 6210-6218 (2014) 

H. B. Jung, S. Kabilan, J. P. Carson, A. P. Kuprat, W. Um, P. Martin, M. Dahl, T. Kafentzis, T. Varga, et al., “Wellbore cement fracture evolution at the cement–basalt caprock interface during geologic carbon sequestration”, Applied Geochemistry, 47, 1-16 (2014) 

Y. Du, K. H. L. Zhang, T. Varga, S. A. Chambers, “Reflection high-energy electron diffraction beam-induced structural and property changes on WO3 thin films”, Applied Physics Letters, 105 (5), 051606 (2014) 

Y. Du, M. Gu, T. Varga, C. Wang, M. E. Bowden, S. A. Chambers, “Strain Accommodation by Facile WO6 Octahedral Distortion and Tilting during WO3 Heteroepitaxy on SrTiO3 (001)”, ACS Applied Materials & Interfaces, 6 (16), 14253-14258 (2014) 

W. Jiang, L. Kovarik, Z. Zhu, T. Varga, M. H. Engelhard, M. E. Bowden, et al., “Microstructure and Cs Behavior of Ba-Doped Aluminosilicate Pollucite Irradiated with F+ Ions”, The Journal of Physical Chemistry C, 118 (31), 18160-18169 (2014) 

J. H. Kwak, T. Varga, C. H. F. Peden, F. Gao, J. C. Hanson, J. Szanyi, “Following the movement of Cu ions in a SSZ-13 zeolite during dehydration, reduction and adsorption: A combined in situ TP-XRD, XANES/DRIFTS study”, Journal of Catalysis, 314, 83-93 (2014) 

Y. Zhang, T. Varga, M. Ishimaru, P. D. Edmondson, H. Xue, P. Liu, S. Moll, et al., “Competing effects of electronic and nuclear energy loss on microstructural evolution in ionic-covalent materials”, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 327, 33-43 (2014) 

A. G. Perez-Bergquist, Y. Zhang, T. Varga, S. Moll, F. Namavar, W. J. Weber, “Temperature-dependent void formation and growth at ion-irradiated nanocrystalline CeO2–Si interfaces”, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 325, 66-72 (2014) 

G. M. Bowers, D. W. Hoyt, S. D. Burton, B. O. Ferguson, T. Varga, R. J. Kirkpatrick, “In Situ 13C and 23Na Magic Angle Spinning NMR Investigation of Supercritical CO2 Incorporation in Smectite–Natural Organic Matter Composites”, The Journal of Physical Chemistry C, 118 (7), 3564-3573 (2014) 

P. Munusamy, S. Sanghavi, T. Varga, T. Suntharampillai, “Silica supported ceria nanoparticles: a hybrid nanostructure to increase stability and surface reactivity of nano-crystalline ceria”, RSC Advances, 4 (17), 8421-8430 (2014) 

Y. Zhang, D. S. Aidhy, T. Varga, S. Moll, P. D. Edmondson, F. Namavar, K. Jin, et al., “The effect of electronic energy loss on irradiation-induced grain growth in nanocrystalline oxides”, Physical Chemistry Chemical Physics, 16 (17), 8051-8059 (2014) 


W. Jiang, R. Devanathan, C. J. Sundgren, M. Ishimaru, K. Sato, T. Varga, et al., “Ion tracks and microstructures in barium titanate irradiated with swift heavy ions: A combined experimental and computational study”, Acta Materialia, 61 (20), 7904-7916 (2013) 

J. E. Jaffe, T. C. Kaspar, T. C. Droubay, T. Varga, “Band offsets for mismatched interfaces: The special case of ZnO on CdTe (001)”, Journal of Vacuum Science & Technology A, 31 (6), 061102 (2013) 

S. Vilayurganapathy, M. I. Nandasiri, A. G. Joly, P. Z. El-Khoury, T. Varga, G. Coffey, B. Schwenzer, A. Pandey, A. Kayani, W. P Hess, S. Thevuthasan, "Silver nanorod arrays for photocathode applications", Applied Physics Letters, 103, 161112 (2013) 

J. S. McCloy, W. Jiang, T. C. Droubay, T. Varga, L. Kovarik, J. A. Sundararajan, M. Kaur, Y. Qiang, E. C. Burks, K. Liu, “Ion irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties”, Journal of Applied Physics, 114, 083903 (2013) 

L. Qiao, K. H. L. Zhang, M. E. Bowden, T. Varga, V. Shutthanandan, R. Colby, Y. Du, B. Kabius, P. V. Sushko, M. D. Biegalski, S. A. Chambers, “The Impacts of Cation Stoichiometry and Substrate Surface Quality on Nucleation, Structure, Defect Formation, and Intermixing in Complex Oxide Heteroepitaxy-LaCrO3 on SrTiO3(001)”, Advanced Functional Materials, 23 (23) 2953-2963  (2013) 

T. Portet, P. N. Holmes, M.. E. Bowden, S. A. Stephens, T. Varga, S. L.  Keller, “Petal Thicknesses and Shape Transformations in Blooming Lilies”, Biophysical Journal, 104 (2), 493A-493A (2013) 

T. Varga, T. C. Droubay, M. E. Bowden, S. Manandhar, V. Shutthanandan, D. Hu, R. J. Colby, B. Kabius, E. Apra, W. A. Shelton, S. A. Chambers, “Coexistence of Weak Ferromagnetism and Polar Lattice Distortion in Epitaxial NiTiO3 Thin Films of the LiNbO3-type Structure”, Journal of Vacuum Science and Technology B, 31 (3) 030603 (2013) 

S. Vilayurganapathy, A. Devaraj, R. J. Colby, A. Pandey, T. Varga, V. Shutthanandan, S. Manandhar, P. Z. El-Khoury, A. Kayani, W. P. Hess, S. Thevuthasan, "Subsurface synthesis and characterization of Ag nanoparticles embedded in MgO", Nanotechnology, 24 (9), 095707 (2013) 

P. V. Shusko, L. Qiao, M. E. Bowden, T. Varga, G. J. Exarhos, F. K. Urban, D. Barton, S. A. Chambers, "Multiband Optical Absorption Controlled by Lattice Strain in Thin-Film LaCrO3", Physical Review Letters, 110 (7), 077401 (2013) 


Y. Zhang, M. Ishimaru, T. Varga, T. Oda, C. Hardiman, H. Z. Xue, Y. Katoh, S. Shannon, W. J. Weber, "Nanoscale engineering of radiation tolerant silicon carbide", Physical Chemistry Chemical Physics, 14 (38), 13429-13436 (2012) 

J. S. Rajachidambaram, S. Sanghavi, P. Nachimuthu, V. Shutthanandan, T. Varga, B. Flynn, S. Thevuthasan, G. S. Herman, “Characterization of Amorphous Zinc Tin Oxide Semiconductors ", Journal of Materials Research, 27 (17), 2309-2317 (2012) 

M. S. Rajachidambaram, T. Varga, L. Kovarik, R. Sanghavi, V. Shutthanandan, S. Thevuthasan, S.-Y. Han, C.-H. Chang, G. S. Herman, “Formation of zinc oxide films using submicron zinc particle dispersions", Journal of Vacuum Science & Technology B, 30 (4), 041805 (2012) 

P. D. Edmondson, Y. Zhang, S. J. Moll, T. Varga, F. Namavar, W. J. Weber, "Anomalous grain growth in the surface region of a nanocrystalline CeO2 film under low-temperature heavy ion irradiation", Physical Review B, 85 (21), 214113 (2012) 

N. Joy, M. I. Nandasiri, P. H. Rogers, W. Jiang, T. Varga, S. V. N. T. Kuchibhatla, S. Thevuthasan, M. A. Carpenter, "Selective Plasmonic Gas Sensing: H2, NO2, and CO Discrimination by a Single Au-CeO2 Nanocomposite Film", Analytical Chemistry, 84 (11), 5025-5034 (2012) 

T. C. Kaspar, M. E. Bowden, T. Varga, C. M. Wang, V. Shutthanandan, A. G. Joly, B. D. Wirth, R. J. Kurtz, "Structural characterization of epitaxial CrxMo1−x alloy thin films", Journal of Physics: Condensed Matter, 24 (9), 095001 (2012) 

T. Varga, T. C. Droubay, M. E.  Bowden, P. Nachimuthu, V. Shutthanandan, T. B. Bolin, W. A. Shelton, S. A. Chambers, "Epitaxial growth of NiTiO3 with a distorted ilmenite structure", Thin Solid Films 520 (17), 5534-5541 (2012) 


Y. Du, D. J. Kim, T. Varga, Z. Wang, J. Szanyi, I. Lyubinetsky, "Formation of single-phase BaO nanoclusters", Thin Solid Films, 519 (16), 5335-5338 (2011) 

D. P. Jaisi, R. K. Kukkadapu, L. M. Stout, T. Varga, R. E. Blake, "Biotic and abiotic pathways of phosphorus cycling in minerals and sediments: insights from oxygen isotopes in phosphate", Environmental Science & Technology, 45 (15), 6254-6261 (2011) 

M. I. Nandasiri, P. Nachimuthu, T. Varga, V. Shutthanandan, W. Jiang, S. V. N. T. Kuchibhatla, S. Thevuthasan, S. Seal, A. N. Kayani, "Influence of growth rate on the epitaxial orientation and crystalline quality of CeO2 thin films grown on Al2O3(0001)", Journal of Applied Physics, 109 (1), 013525:1-7 (2011) 

L. Qiao, T. C. Droubay, T. Varga, M. E. Bowden, V. Shutthanandan, Z. Zhu, T. C. Kaspar, S. A. Chambers, "Epitaxial growth, structure and intermixing at the LaAlO3/SrTiO3 interface as the film stoichiometry is varied", Physical Review B, 83 (8) ,085408 (2011) 

Y. Zhang, P. D. Edmondson, T. Varga, S. J. Moll, F. Namavar, C. Lan, W. J. Weber, "Structural Modification of Nanocrystalline Ceria by Ion Beams", Physical Chemistry Chemical Physics, 13 (25), 11946-11950 (2011) 

Tamas Varga, "Materials That Shrink on Heating: Pressure-Induced Phase Transitions in Negative Thermal Expansion Materials, and Their Energetics" Book Chapter in Advances in Chemistry Research, Vol. 10, Chapter 1, ed. JC Taylor, pp. 1-54. Nova Science Publishers, Inc., Hauppauge, NY (2011) 


R. P. Sanghavi, M. I. Nandasiri, S. V. N. T. Kuchibhatla, W. Jiang, T. Varga, P. Nachimuthu, M. H. Engelhard, V. Shutthanandan, S. Thevuthasan, A. N. Kayani, S. Prasad, "Thickness Dependency of Thin Film Samaria Doped Ceria for Oxygen Sensing", IEEE Sensors Journal 11 (1), 217-224 (2010) 

T. Varga, J. F. Mitchell, J. Wang, L. Arnold, B. H. Toby, C. D. Malliakas, “High-Pressure Synthesis, Crystal and Electronic Structures of A New Scandium Tungstate, Sc0.67WO4”, Journal of Solid State Chemistry, 183 (7), 1567-1573 (2010) 

J. E. Jaffe, T. C. Kaspar, T. C. Droubay, T. Varga, M. E. Bowden, G. J. Exarhos, “Electronic and Defect Structures of CuSCN”, Journal of Physical Chemistry C, 114 (19), 9111-9117 (2010) 

Y. G. Shi, Y. F. Guo, S. Yu, M. Arai, A. A. Belik, A. Sato, K. Yamaura, 
E. Takayama-Muromachi, T. Varga, J. F. Mitchell, “High-pressure crystal growth and magnetic and electrical properties of the quasi-one dimensional osmium oxide Na2OsO4“, Journal of Solid State Chemistry, 183 (2), 402-407 (2010) 


Y. G. Shi, Y. F. Guo, S. Yu, M. Arai, A. A. Belik, A. Sato, K. Yamaura, E. Takayama-Muromachi, H. F. Tian, H. X. Yang, J. Q. Li, T. Varga, J. F. Mitchell, S. Okamoto, “Continuous metal-insulator transition of the antiferromagnetic perovskite NaOsO3“, Physical Review B, 80 (16), 161104 (2009) 

T. Varga, A. Kumar, E. Vlahos, S. Denev, M. Park, S. Hong, T. Sanehira, Y. Wang, C. J. Fennie, S. K. Streiffer, X. Ke, P. Schiffer, V. Gopalan, J.F. Mitchell, “Coexistence of Weak Ferromagnetism and Ferroelectricity in the High Pressure LiNbO3-type Phase of FeTiO3”, Physical Review Letters, 103 (4), 047601 (2009) 

T. Varga, A. P. Wilkinson, “Zirconium coordination change upon the pressure-induced amorphization of cubic ZrW2O8 and ZrMo2O8”, Physical Review B, 79 (22), 224119 (2009) 

T. Varga, J. F. Mitchell, K. Yamaura, D. G. Mandrus, J. Wang, “A Ca substitution study of NaV2O4: high-pressure synthesis of the Na1-xCaxV2O4 solid solution”, Solid State Sciences, 11 (3), 694-699 (2009) 


R. M. Morcos, G. Mera, A. Navrotsky, T. Varga, R. Riedel, F. Poli, K. Müller, „Enthalpy of Formation of Carbon-Rich Polymer-Derived Amorphous SiCN Ceramics”, Journal of the American Ceramic Society, 91 (10), 3349-3354 (2008) 

R. M. Morcos, A. Navrotsky, T. Varga, Yigal Blum, Dongjoon Ahn, Fabrizia Poli, Klaus Müller, Rishi Raj, “Energetics of SixOyCz Polymer Derived Ceramics Prepared Under Varying Conditions”, Journal of the American Ceramic Society, 91 (9), 2969-2974 (2008) 

R. M. Morcos, A. Navrotsky, T. Varga, D. Ahn, A. Saha, F. Poli, K. Müller, R. Raj, “Thermodynamically Stable SiwCxNyOz Polymer–Like, Amorphous-Ceramics Made from Organic Precursors”, Journal of the American Ceramic Society, 91 (7), 2391-2393 (2008) 


T. Varga, A. Navrotsky, J. L. Moats, R. M. Morcos, F. Poli, K. Müller, A. Saha, R. Raj “Thermodynamically Stable SixOyCz Polymer–Like Amorphous Ceramics”, Journal of the American Ceramic Society, 90 (10), 3213-3219 (2007) 

T. Varga, J. L. Moats, S. V. Ushakov, A. Navrotsky “Thermochemistry of A2M3O12 negative thermal expansion materials”, Journal of Materials Research, 22 (9), 2512-2521 (2007) 

C. M. Kennedy, M. A. White, A. P. Wilkinson, T. Varga “Heat Capacity, Lattice Dynamics and Thermodynamic Stability of the Negative Thermal Expansion Material, HfMo2O8”, Physical Review B, 75 (22), 224302 (2007) 

C. M. Kennedy, M. A. White, A. P. Wilkinson, T. Varga “Low Thermal Conductivity of the Negative Thermal Expansion Material, HfMo2O8”, Applied Physics Letters, 90 (15), 151906 (2007) 

T. Varga, C. Lind, A. P. Wilkinson, H, Xu, A. Navrotsky “Heats of Formation for Several Crystalline Polymorphs and Pressure-Induced Amorphous Forms of AM2O8 (A = Zr, Hf) and ZrW2O8”, Chemistry of Materials, 19, 468-476 (2007) 


C. L. Condron, T. Varga, A. Clark, C. E. Lesher, A. Navrotsky, S. M. Kauzlarich; “Thermodynamics of the silicone type I clathrates: Ba8Si46 and Na8Si46”, Abstracts of Papers of the American Chemical Society, 232, INOR-361 (2006)  

T. Varga, A. P. Wilkinson, J. D. Jorgensen, S. Short, “Neutron powder diffraction study of the orthorhombic to monoclinic transition in Sc2(WO4)3 on compression”, Solid State Sciences, 8 (3-4), 289-295 (2006) 


T. Varga, A. P. Wilkinson, M. Haluska, E. A. Payzant, “Preparation and thermal expansion of (MIII0.5M’V0.5)P2O7 with the cubic ZrP2O7 structure”, Journal of Solid State Chemistry, 178, 3541-3546 (2005) 

T. Varga, A. P. Wilkinson, C. Lind, W. A. Bassett, C.-S. Zha, “Pressure-induced amorphization of cubic ZrMo2O8 studied in situ by x-ray absorption spectroscopy and diffraction”, Solid State Communications, 135, 739-744 (2005) 

T. Varga, A. P. Wilkinson, C. Lind, W. A. Bassett, C.-S. Zha, “High pressure synchrotron x-ray powder diffraction study of Sc2(MoO4)3 and Al2(WO4)3”, Journal of Physics: Condensed Matter, 17, 4271-4283 (2005) 

T. Varga, A. P. Wilkinson, A. C. Jupe, C. Lind, W. A. Bassett, C.-S. Zha, “Pressure-induced amorphization of cubic ZrW2O8 studied in situ and ex situ by synchrotron x-ray diffraction and absorption”, Physical Review B, 72, 024117 (2005) 

T. Varga, A. P. Wilkinson, C. Lind, W. A. Bassett, C.-S. Zha, “In situ high-pressure synchrotron x-ray diffraction study of Sc2(WO4)3 at up to 10 GPa”, Physical Review B, 71, 214106 (2005) 


T. Varga, A. P. Wilkinson, R. J. Angel, “Fluorinert as a pressure-transmitting medium for high pressure diffraction studies”, Review of Scentific Instruments, 74 (10), 4564-4566 (2003) 


K. Kovacs-Hadady, T. Varga, “A systematic study of impregnation of thin layers with different ion-pairing reagents and by different methods“, Journal of Planar Chromatography – Modern TLC, 8 (4), 292-299 (1995)