Abstract
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.
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