Thermodynamic functions of magnesium gallate MgGa2O4 in the temperature range 0-1200Â K

The heat capacity of magnesium gallate MgGa2O4 was measured by adiabatic calorimetry (7-347 K) and differential scanning calorimetry (322-1200 K). Thermodynamic functions (heat capacity, entropy, enthalpy change and derived Gibbs energy) were calculated in the range 0-1200 K. Gibbs energy of formation of MgGa2O4 was estimated using the standard entropy S0(298.15 K) from this work: ΔfG0(MgGa2O4, 298.15 K) = −1594.3 ± 4.3 kJ mol−1. The Debye characteristic temperature ΘD = 750 ± 20 K was calculated from heat capacity data and from elastic constants.