Title: The high-temperature heat capacity of the (Th,U)O2 and (U,Pu)O2 solid solutions
Authors: VALU OCTAVIANBENES ONDREJMANARA DARIOKONINGS RUDYCOOPER MICHAEL W.D.GRIMES R. W.GUENEAU CHRISTINE
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 484 p. 1-6
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2017
JRC N°: JRC91783
ISSN: 0022-3115
URI: https://www.sciencedirect.com/science/article/pii/S0022311516310789?via%3Dihub
http://publications.jrc.ec.europa.eu/repository/handle/JRC91783
DOI: 10.1016/j.jnucmat.2016.11.010
Type: Articles in periodicals and books
Abstract: The enthalpy increment data for the (Th,U)O2 and (U,Pu)O2 solid solutions are reviewed and complemented with new experimental data (400-1773 K) for not yet measured compositions. The results of the review show that from room temperature up to about 2000 K the enthalpy data are in agreement with the additivity rule (Neumann-Kopp) in the whole composition range. Above 2000 K the effect of Oxygen Frenkel Pair (OFP) formation leads to an excess enthalpy (heat capacity) that is modeled using the enthalpy and entropy of OFP formation from the end members derived previously. A good agreement with existing experimental work is observed.
JRC Directorate:Nuclear Safety and Security

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