Investigations of the thermodynamic properties of bismuth silicate stable compounds is of practical importance in a viewof their valuable properties. The heat capacity of Bi12SiO20 and Bi4Si3O12 compounds in temperature range from 330K to 1135 K has been determined. The modified Debye function was employed to describe the low-temperature heat capacities, and from the obtained function, the standard entropy, S 298, of bismuth silicates Bi12SiO20 and for Bi4Si3O12were estimated as 15.7 2.2 J/mol atomsK 1 and 13.9 1.5 J/mol atomsK 1, respectively. A three-term Maier Kelley polynomial representation, a + b T + c T 2 was used above 298 K to describe the heat capacity data.
Compounds
#
Formula
Name
1
Bi12O20Si
bismuth oxide silicate (Bi12SiO20)
2
Bi4O12Si3
bismuth silicate (Bi4Si3O12)
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
Small sample (50 mg) DSC
76
POMD
2
Molar heat capacity at constant pressure, J/K/mol ; Crystal