Phase equilibria and stability of intermediate phases in the Sm2O3–BaO–Fe2O3 system

Phase equilibria and stability of intermediate phases in the Sm2O3–BaO–Fe2O3 system

Phase equilibria in the ½ Sm2O3–BaO–½ Fe2O3 system were systematically studied at 1100°C in air. Two individual compounds: Sm1.875Ba3.125Fe5O15‐δ and Ba3SmFe2O7.5+δ have been detected in the studied system at 1100°C in air. One more complex oxide with double perovskite structure SmBaFe2O5+w has been...

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Veröffentlicht in:Journal of the American Ceramic Society 2021-05, Vol.104 (5), p.2410-2417
Hauptverfasser: Volkova, Nadezhda E., Tolstov, Konstantin S., Gavrilova, Ludmila Ya, Raveau, Bernard, Maignan, Antoine, Cherepanov, Vladimir A.
Format: Artikel
Sprache:eng
Schlagworte:
Barium oxides
Metastable state
oxides
Partial pressure
Perovskite structure
Perovskites
Phase diagrams
Phase equilibria
Thermal stability
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Zusammenfassung:Phase equilibria in the ½ Sm2O3–BaO–½ Fe2O3 system were systematically studied at 1100°C in air. Two individual compounds: Sm1.875Ba3.125Fe5O15‐δ and Ba3SmFe2O7.5+δ have been detected in the studied system at 1100°C in air. One more complex oxide with double perovskite structure SmBaFe2O5+w has been obtained under reduced oxygen partial pressure. Thermodynamic stability of SmBaFe2O5+w and its thermal stability in metastable state in air were determined. The subsolidus phase diagram for the ½ Sm2O3 – BaO – ½ Fe2O3 system at 1100°C in air has been constructed.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17602