The titanosilicates: Ba2TiSi2O8(s)(BTS) and Sr2TiSi2O8(s)(STS) were synthesized by citrate nitrate gel combustion and complex polymerisation method, respectively and characterized using X-ray diffraction (XRD) technique. The heat capacity, thermal diffusivity, average thermal expansion coefficient, the standard molar Gibbs energy of formation of BTS and STS were measured with a heat flux-type differential scanning calorimeter, laser flash technique, high temperature XRD and solid oxide Gavanic cell, respectively. The heat capacities of BTS and STS were found to be comparable upto 600 K and afterwards, the increase is higher in BTS. Thermal conductivity of BTS was found to be higher than that of STS. The average volume thermal expansion coefficient of BTS was found to be lower than that of STS. The enthalpy of formation of BTS and STS were derived from their respective Gibbs energy data and their thermodynamic functions were calculated.
Compounds
#
Formula
Name
1
Ba2O8Si2Ti
barium titanium silicate (Ba2Si2TiO8)
2
O8Si2Sr2Ti
strontium titanium silicate (Sr2TiSi2O8)
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
58
POMD
1
Thermal diffusivity, m2/s ; Crystal
Temperature, K; Crystal
Pressure, kPa; Crystal
Crystal
Laser flash apparatus
11
POMD
1
Mass density, kg/m3 ; Crystal
Temperature, K; Crystal
Pressure, kPa; Crystal
Crystal
X-ray diffraction
11
POMD
2
Molar heat capacity at constant pressure, J/K/mol ; Crystal