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Title: First-principles study of surface properties of uranium silicides

Abstract

Uranium silicides are currently under investigation as accident tolerant fuels for light water reactors because of its high uranium density and high thermal conductivity. Surface energy as an important material property is required for modeling of gas bubble behavior in nuclear fuels using mesoscale approaches, such as phase field and rate theory methods. However, there is no such information available for uranium silicides from either experiment or theory. To this end, we study the surface properties of two uranium silicide compounds U3Si2 and U3Si using first-principles calculations. Of the low-index facets of tetragonal U3Si2 and U3Si, we study a total of 13 surfaces up to a maximum Miller index of 3. From the calculated surface energies, the equilibrium single crystal shapes of U3Si2 and U3Si are obtained using Wulff construction. The dominant surface orientation, surface area weighted surface energy and surface anisotropy are predicted. The obtained surface properties of U3Si2 and U3Si can be used for an accurate description of the morphology of fission gas bubbles in uranium silicide fuels in the future.

Authors:
; ORCiD logo; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy - Nuclear Energy Advanced Modeling and Simulation (NEAMS)
OSTI Identifier:
1484033
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 513; Journal Issue: C
Country of Publication:
United States
Language:
English

Citation Formats

Mei, Zhi-Gang, Miao, Yinbin, Liang, Linyun, and Yacout, Abdellatif M. First-principles study of surface properties of uranium silicides. United States: N. p., 2019. Web. doi:10.1016/j.jnucmat.2018.10.048.
Mei, Zhi-Gang, Miao, Yinbin, Liang, Linyun, & Yacout, Abdellatif M. First-principles study of surface properties of uranium silicides. United States. doi:10.1016/j.jnucmat.2018.10.048.
Mei, Zhi-Gang, Miao, Yinbin, Liang, Linyun, and Yacout, Abdellatif M. Tue . "First-principles study of surface properties of uranium silicides". United States. doi:10.1016/j.jnucmat.2018.10.048.
@article{osti_1484033,
title = {First-principles study of surface properties of uranium silicides},
author = {Mei, Zhi-Gang and Miao, Yinbin and Liang, Linyun and Yacout, Abdellatif M.},
abstractNote = {Uranium silicides are currently under investigation as accident tolerant fuels for light water reactors because of its high uranium density and high thermal conductivity. Surface energy as an important material property is required for modeling of gas bubble behavior in nuclear fuels using mesoscale approaches, such as phase field and rate theory methods. However, there is no such information available for uranium silicides from either experiment or theory. To this end, we study the surface properties of two uranium silicide compounds U3Si2 and U3Si using first-principles calculations. Of the low-index facets of tetragonal U3Si2 and U3Si, we study a total of 13 surfaces up to a maximum Miller index of 3. From the calculated surface energies, the equilibrium single crystal shapes of U3Si2 and U3Si are obtained using Wulff construction. The dominant surface orientation, surface area weighted surface energy and surface anisotropy are predicted. The obtained surface properties of U3Si2 and U3Si can be used for an accurate description of the morphology of fission gas bubbles in uranium silicide fuels in the future.},
doi = {10.1016/j.jnucmat.2018.10.048},
journal = {Journal of Nuclear Materials},
number = C,
volume = 513,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2019},
month = {Tue Jan 01 00:00:00 EST 2019}
}