Thermodynamic investigations on compounds of ZnO-V2O5 system

Abstract

In the present paper, thermodynamic properties of compounds of ZnO-V2O5 system have been reported. Phase pure compounds of ZnO-V2O5 system viz., ZnV2O6, Zn2V2O7, Zn3V2O8 and Zn4V2O9 have been prepared and characterized. The standard molar enthalpies of formation of these compounds at 298 K (∆fH298o) and their isobaric heat capacity were determined employing calorimetric techniques. From their enthalpy of formation and the temperature dependent molar heat capacity data, thermodynamic functions of ZnV2O6(s), Zn2V2O7(s), Zn3V2O8(s) and Zn4V2O9(s) compounds have been derived. From these derived thermodynamic parameters, the relative stabilities of the compounds were determined.