Title: The Low-temperature Heat Capacity and Standard Entropy of Synthetic Huttonite ThSi04
Authors: KONINGS RUDYPOPA KarinWASTIN FRANCKCOLINEAU ERIC
Citation: JOURNAL OF CHEMICAL THERMODYNAMICS vol. 40 p. 931-934
Publisher: ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
Publication Year: 2008
JRC N°: JRC45319
ISSN: 0021-9614
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC45319
DOI: 10.1016/j.jct.2008.02.001
Type: Articles in Journals
Abstract: The low-temperature heat capacity of synthetic huttonite ThSiO4 has been measured from T = (2 to 300) K. The sample was synthesised successfully from SiO2 and ThO2 by solid-state reaction at T = 1873 K at atmospheric pressure. From the calorimetric results, the value for the standard entropy (ThSiO4, huttonite, 298.15 K) = (104.3 ± 2.0) J · K-1 · mol-1 has been obtained. This value indicates that the entropy of reaction from SiO2 and ThO2 is negative, giving a positive entropy term (-T · ¿rS) of the Gibbs free energy of reaction. The implications of this finding are discussed extensively.
JRC Institute:Institute for Transuranium Elements

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