Minor impurity elements in metallic nuclear materials can critically influence the microstructural evolution and mechanical properties, making it crucial to understand the structure, composition and distribution of the impurity phases. Using Transmission Electron Microscopy, Atom Probe Tomography and ab-initio calculations we provide the atomic scale crystallographic structural and compositional analysis of a new impurity phase: U2MoSi2C in an important nuclear fuel U-10Mo alloy. We identify the new phase to have tetragonal symmetry with lattice parameters of a=6.67Å, c=4.33Å, and space group P4/mbm (No.127). Ab-initio calculations were performed to verify structural stability and to perform atom positions refinement.
Revised: June 13, 2019 |
Published: June 3, 2019
Citation
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