Thermodynamic properties of LaCrO3

The nano powders of LaCrO3 were prepared by a sol-gel route. Pie heat capacity of LaCrO3 nano powders from 350 to 550 K was measured by DSC method and expressed as: C-p(LaCrO3) (+/- 0.112) = 166.844 - 8.500 x 10(-3)T - 1.022 x 10(6)T(-2) (J/(mol center dot 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, O-2 (1 atm)vertical bar CaF2 vertical bar O-2(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: Delta G(f,LaCrO3)(circle minus) = -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: Delta G(f,ox(LaCrO3))? = -94.758 + 8.530 x 10(-2)T (kJ/mol) (700-885 K).