Thermophysical properties of Ba1−xSrxMoO3(s)

Abstract

Ba1−xSrxMoO3(s) (x=0, 0.2, 0.4, 0.5, 0.8, 1) solid-solutions were synthesized by reduction of corresponding Ba1−xSrxMoO4(s) and were characterized using X-ray diffraction (XRD). Thermal expansion behavior of Ba1−xSrxMoO3(s) (x=0, 0.4, 0.8 and 1) were investigated in the temperature range 298–873K by high temperature X-ray diffraction (HTXRD). The average volume thermal expansion coefficient of Ba1−xSrxMoO3(s) (x=0, 0.4, 0.8 and 1) was found to be 2.83×10−5, 2.20×10−5, 2.02×10−5 and 2.27×10−5K−1, respectively. Heat capacity of Ba1−xSrxMoO3(s) (x=0, 0.4, 0.8, 1) was measured with a heat flux-type differential scanning calorimeter (DSC) in the temperature range 290–870K. The specific heat of Ba1−xSrxMoO3(s) was found to increase with increase in concentration of strontium. The thermodynamic functions such as enthalpy increment, entropy and Gibbs energy functions of Ba1−xSrxMoO3(s) were also calculated.