Thermodynamic properties of LaCrO3

The nano powders of LaCrO3 were prepared by a sol-gel route. The heat capacity of LaCrO3 nano powders from 350 to 550 K was measured by DSC method and expressed as: Cp(LaCrO3) (±0.112) = 166.844 − 8.500 × 10−3T − 1.022 × 106T−2 (J/(mol·K)) (350-550 K). An EMF measurement assembly was developed with CaF2 as an electrolyte for the galvanic cell. From measured EMF data of the reversible cell, (−) Pt, La2O3, LaF3, O2 (1 atm)|CaF2|O2(1 atm), LaF3, LaCrO3, Cr2O3, Pt(+), and the relevant value of Gibbs free energy, the Gibbs free energy of formation of LaCrO3 was calculated from 700 to 885 K: ΔGf,LaCrO3 = −1555.364 + 0.354T (kJ/mol) (700-885 K). And the Gibbs free energy change of reaction from simple oxides La2O3 and Cr2O3 was calculated to be: ΔGf,ox(LaCrO3) = −94.758 + 8.530 × 10−2T(kJ/mol) (700-885 K).