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Title: Enthalpy of formation of U 3Si 2: A high-temperature drop calorimetry study

Abstract

U 3Si 2 is presently receiving consideration as a high density light water reactor fuel. A reliable knowledge of the formation enthalpy of U 3Si 2 not only helps study the thermal stability but also facilitate the modeling efforts by serving as a benchmark parameter for thermodynamic calculations of phase equilibria at high temperatures. Previous high temperature thermal analysis on U 3Si 2 laid the basis for us to conduct two types of high-temperature drop calorimetric measurements to determine its enthalpy of formation: oxide-melt drop-solution calorimetry and transposed temperature drop calorimetry, from which the results obtained are consistent. The determined standard enthalpy of formation of U 3Si 2 per mole atom, -33.2 ± 3.1 kJ/mol∙at.%, is in good agreement with previously reported values obtained by other techniques. Our drop calorimetry methods will be used for thermodynamic studies of other U-Si compounds whose enthalpies of formation are not available.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2];  [2];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Washington State Univ., Pullman, WA (United States). Dept. of Chemistry
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1479951
Alternate Identifier(s):
OSTI ID: 1532560
Report Number(s):
[LA-UR-18-22051]
[Journal ID: ISSN 0022-3115]
Grant/Contract Number:  
[AC52-06NA25396]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
[ Journal Volume: 507; Journal Issue: C]; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Uranium silicide; High temperature drop calorimetry; Enthalpy of formation

Citation Formats

Guo, Xiaofeng, White, Joshua T., Nelson, Andrew T., Migdisov, Artaches, Roback, Robert, and Xu, Hongwu. Enthalpy of formation of U3Si2: A high-temperature drop calorimetry study. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.04.032.
Guo, Xiaofeng, White, Joshua T., Nelson, Andrew T., Migdisov, Artaches, Roback, Robert, & Xu, Hongwu. Enthalpy of formation of U3Si2: A high-temperature drop calorimetry study. United States. doi:10.1016/j.jnucmat.2018.04.032.
Guo, Xiaofeng, White, Joshua T., Nelson, Andrew T., Migdisov, Artaches, Roback, Robert, and Xu, Hongwu. Sat . "Enthalpy of formation of U3Si2: A high-temperature drop calorimetry study". United States. doi:10.1016/j.jnucmat.2018.04.032. https://www.osti.gov/servlets/purl/1479951.
@article{osti_1479951,
title = {Enthalpy of formation of U3Si2: A high-temperature drop calorimetry study},
author = {Guo, Xiaofeng and White, Joshua T. and Nelson, Andrew T. and Migdisov, Artaches and Roback, Robert and Xu, Hongwu},
abstractNote = {U3Si2 is presently receiving consideration as a high density light water reactor fuel. A reliable knowledge of the formation enthalpy of U3Si2 not only helps study the thermal stability but also facilitate the modeling efforts by serving as a benchmark parameter for thermodynamic calculations of phase equilibria at high temperatures. Previous high temperature thermal analysis on U3Si2 laid the basis for us to conduct two types of high-temperature drop calorimetric measurements to determine its enthalpy of formation: oxide-melt drop-solution calorimetry and transposed temperature drop calorimetry, from which the results obtained are consistent. The determined standard enthalpy of formation of U3Si2 per mole atom, -33.2 ± 3.1 kJ/mol∙at.%, is in good agreement with previously reported values obtained by other techniques. Our drop calorimetry methods will be used for thermodynamic studies of other U-Si compounds whose enthalpies of formation are not available.},
doi = {10.1016/j.jnucmat.2018.04.032},
journal = {Journal of Nuclear Materials},
number = [C],
volume = [507],
place = {United States},
year = {2018},
month = {4}
}

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