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|Title:||The Low-temperature Heat Capacity and Standard Entropy of Synthetic Huttonite ThSi04|
|Authors:||KONINGS RUDY; POPA Karin; WASTIN FRANCK; COLINEAU ERIC|
|Citation:||JOURNAL OF CHEMICAL THERMODYNAMICS vol. 40 p. 931-934|
|Publisher:||ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD|
|JRC Publication N°:||JRC45319|
|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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