Thermodynamic properties of LaCrO3

稀有金属（英文版）, 2006, 25(5): 562-566.

^1, , ^2, , ^3, , ^4, , ^5,

1.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;Office of the Chinese Society of Rare Earths, Beijing 100081, China

2.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

3.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

4.National Engineering Research Center for Rare Earth Materials, Beijing 100088, China

5.National Engineering Research Center for Rare Earth Materials, Beijing 100088, China

基金项目: 国家自然科学基金(50374009;20331030;20571009)

Thermodynamic properties of LaCrO3

Keywords： lanthanum chromate

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 ×vanic 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: △G(φ) f,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: △G(φ) f,ox(LaCrO3) = -94.758 + 8.530 × 10-2T (kJ/mol) (700-885 K).

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Thermodynamic properties of LaCrO3

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