Title: The low-temperature heat capacity of the (Th, Pu)O2 solid solution
Authors: VALU SORINBENES ONDREJKONINGS RudyGRIVEAU Jean-ChristopheCOLINEAU Eric
Citation: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS vol. 86 p. 194-206
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2015
JRC N°: JRC91308
ISSN: 0022-3697
URI: http://www.sciencedirect.com/science/article/pii/S0022369715300044
http://publications.jrc.ec.europa.eu/repository/handle/JRC91308
DOI: 10.1016/j.jpcs.2015.06.020
Type: Articles in periodicals and books
Abstract: The low-temperature heat capacity of the (Th1−y,Puy)O2 solid solution with y=0.03, 0.08, 0.30, 0.54 and 0.85 was determined from 4 K up to about 300 K with a PPMS instrument using the hybrid adiabatic relaxation method. In addition, the heat capacity of 239PuO2 end member was also measured and compared with available literature data for 242PuO2, observing an indistinguishable match. The obtained heat capacity values of the intermediate compositions are greater than the data obtained from Neumann–Kopp's molar additivity rule based on the ThO2 and PuO2 end-members, and a substantial excess capacity is observed for all intermediate compositions, particularly at the lowest temperatures.
JRC Directorate:Nuclear Safety and Security

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