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 S m (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 DrS) of the Gibbs free energy of reaction. The implications of this finding are discussed extensively.
Compounds
#
Formula
Name
1
O4SiTh
thorium silicate
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Molar heat capacity at constant pressure, J/K/mol ; Crystal
Temperature, K; Crystal
Pressure, kPa; Crystal
Crystal
PPMS-Quantum Design
150
POMD
1
Molar heat capacity at constant pressure, J/K/mol ; Crystal