A combined calorimetric and computational study of the energetics of rare earth substituted UO2 systems
Abstract
The energetics of rare earth substituted UO2 solid solutions (U1-xLnxO2-0.5x+y, where Ln = La, Y, and Nd) are explored employing a combination of calorimetric measurements and density functional theory based computations. Calculated and measured formation enthalpies agree within 10 kJ/mol for stoichiometric oxygen/metal compositions. To better understand the factors governing the stability and defect binding in rare earth substituted urania solid solutions, systematic trends in the energetics are investigated based on the present results and previous computational and experimental thermochemical studies of rare earth substituted fluorite oxides (A1-xLnxO2-0.5x, where A = Hf, Zr, Ce, and Th). A consistent trend towards increased energetic stability with larger size mismatch between the smaller host tetravalent cation and the larger rare earth trivalent cation is found for both actinide and non-actinide fluorite oxide systems where aliovalent substitution of Ln cations is compensated by oxygen vacancies. Yet, the large exothermic oxidation enthalpy in the UO2 based systems favors oxygen rich compositions where charge compensation occurs through the formation of uranium cations with higher oxidation states.
- Authors:
-
- Univ. of California, Davis, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- Univ. of California, Davis, CA (United States); Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1370874
- Alternate Identifier(s):
- OSTI ID: 1254764
- Grant/Contract Number:
- SC0001089; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: C; Related Information: MSA partners with University of Notre Dame (lead); University of California, Davis; Florida State University; George Washington University; University of Michigan; University of Minnesota; Oak Ridge National Laboratory; Oregon state University; Rensselaer Polytechnic Institute; Savannah River National Laboratory; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Formation enthalpy; Fluorite oxide; Calorimetry; DFT
Citation Formats
Zhang, Lei, Solomon, Jonathan M., Asta, Mark, and Navrotsky, Alexandra. A combined calorimetric and computational study of the energetics of rare earth substituted UO2 systems. United States: N. p., 2015.
Web. doi:10.1016/j.actamat.2015.06.048.
Zhang, Lei, Solomon, Jonathan M., Asta, Mark, & Navrotsky, Alexandra. A combined calorimetric and computational study of the energetics of rare earth substituted UO2 systems. United States. https://doi.org/10.1016/j.actamat.2015.06.048
Zhang, Lei, Solomon, Jonathan M., Asta, Mark, and Navrotsky, Alexandra. Mon .
"A combined calorimetric and computational study of the energetics of rare earth substituted UO2 systems". United States. https://doi.org/10.1016/j.actamat.2015.06.048. https://www.osti.gov/servlets/purl/1370874.
@article{osti_1370874,
title = {A combined calorimetric and computational study of the energetics of rare earth substituted UO2 systems},
author = {Zhang, Lei and Solomon, Jonathan M. and Asta, Mark and Navrotsky, Alexandra},
abstractNote = {The energetics of rare earth substituted UO2 solid solutions (U1-xLnxO2-0.5x+y, where Ln = La, Y, and Nd) are explored employing a combination of calorimetric measurements and density functional theory based computations. Calculated and measured formation enthalpies agree within 10 kJ/mol for stoichiometric oxygen/metal compositions. To better understand the factors governing the stability and defect binding in rare earth substituted urania solid solutions, systematic trends in the energetics are investigated based on the present results and previous computational and experimental thermochemical studies of rare earth substituted fluorite oxides (A1-xLnxO2-0.5x, where A = Hf, Zr, Ce, and Th). A consistent trend towards increased energetic stability with larger size mismatch between the smaller host tetravalent cation and the larger rare earth trivalent cation is found for both actinide and non-actinide fluorite oxide systems where aliovalent substitution of Ln cations is compensated by oxygen vacancies. Yet, the large exothermic oxidation enthalpy in the UO2 based systems favors oxygen rich compositions where charge compensation occurs through the formation of uranium cations with higher oxidation states.},
doi = {10.1016/j.actamat.2015.06.048},
journal = {Acta Materialia},
number = C,
volume = 97,
place = {United States},
year = {Mon Jul 13 00:00:00 EDT 2015},
month = {Mon Jul 13 00:00:00 EDT 2015}
}
Web of Science
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