Enthalpy of formation of U3Si2: A high-temperature drop calorimetry study

Xiaofeng Guo; Joshua T. White; Andrew T. Nelson; Artaches Migdisov; Robert Roback; Hongwu Xu

doi:10.1016/j.jnucmat.2018.04.032

Enthalpy of formation of U₃Si₂: A high-temperature drop calorimetry study

Xiaofeng Guo, Joshua T. White, Andrew T. Nelson, Artaches Migdisov, Robert Roback, Hongwu Xu

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	44-49
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	507
DOIs	https://doi.org/10.1016/j.jnucmat.2018.04.032
State	Published - Aug 15 2018
Externally published	Yes

Funding

This work was supported by the laboratory-directed research and development (LDRD) program (Project #20180007DR) of Los Alamos National Laboratory. Portions of this research were performed using funding received from the DOE Office of Nuclear Energy's Nuclear Energy University Program. X.G. Guo acknowledges the support through a LANL Seaborg postdoctoral fellowship. The assistance by D.D. Byler in the preparation of the U This work was supported by the laboratory-directed research and development (LDRD) program (Project # 20180007DR ) of Los Alamos National Laboratory . Portions of this research were performed using funding received from the DOE Office of Nuclear Energy's Nuclear Energy University Program . X.G. Guo acknowledges the support through a LANL Seaborg postdoctoral fellowship . The assistance by D.D. Byler in the preparation of the U 3 Si 2 buttons is greatly appreciated. LANL is operated by Los Alamos National Security LLC , under DOE Contract DE-AC52-06NA25396 .

Keywords

Enthalpy of formation
High temperature drop calorimetry
Uranium silicide

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10.1016/j.jnucmat.2018.04.032

Cite this

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title = "Enthalpy of formation of U3Si2: A high-temperature drop calorimetry study",

abstract = "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.",

keywords = "Enthalpy of formation, High temperature drop calorimetry, Uranium silicide",

author = "Xiaofeng Guo and White, {Joshua T.} and Nelson, {Andrew T.} and Artaches Migdisov and Robert Roback and Hongwu Xu",

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T2 - A high-temperature drop calorimetry study

AU - Guo, Xiaofeng

AU - White, Joshua T.

AU - Nelson, Andrew T.

AU - Migdisov, Artaches

AU - Roback, Robert

AU - Xu, Hongwu

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AB - 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.

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