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Thermodynamics of lanthanide and actinide perovskite-type oxides IV. Molar enthalpies of formation of MM′O3 (M = Ba or Sr, M′ = Ce, Tb, or Am) compounds

1990; Elsevier BV; Volume: 22; Issue: 6 Linguagem: Inglês

10.1016/0021-9614(90)90150-o

1096-3626

J. Goudiakas, R.G. Haire, J. Fuger,

Radioactive element chemistry and processing

The standard molar enthalpies of formation ΔfHmo of several ternary oxides of quadrivalent lanthanide or actinide with alkaline earths have been determined at 298.15 K and po = 101.325 kPa. The results for ΔfHmo/(kJ·mol−1) are as follows: BaCeO3, −(1686.5 ± 3.9); SrCeO3, −(1685.6±3.8); BaTbO3, −(1609.0±2.7); SrTbO3, −(1612.9±2.1); BaAmO3, −(1544.6±3.4); and SrAmO3, −(1539.0±4.1). The stabilities of these complex oxides with respect to their parent binary oxides are discussed.