Characterization and thermo physical property investigations on Ba1−xSrxMoO4 (x = 0, 0.18, 0.38, 0.60, 0.81, 1) solid-solutions

Abstract

Ba1−xSrxMoO4 (x=0, 0.18, 0.38, 0.60, 0.81, 1) solid-solutions were synthesized by complex polymerization method. The solid solutions were characterized using X-ray diffraction (XRD) and the Raman spectroscopy. Heat capacity measurements on Ba1−xSrxMoO4(s) were performed with heat flux-type differential scanning calorimeter in the temperature range of 140–870K. The measured heat capacity values were used to calculate different thermodynamic functions such as enthalpy increment, entropy and Gibbs energy functions. Thermal expansion behavior of Ba1−xSrxMoO4(s) (x=0, 0.6 and 1) were investigated in the temperature range 298–1273K by high temperature X-ray diffraction (HTXRD). The specific heat and average volume thermal expansion coefficient of Ba1−xSrxMoO4(s) was found to increase with increase in concentration of strontium. The average volume thermal expansion coefficient of Ba1−xSrxMoO4(s) (x=0, 0.6 and 1) was found to be 25.59×10−6, 33.86×10−6 and 34.37×10−6K−1 respectively.