Phase equilibria and stability of intermediate phases in the Sm <sub>2</sub> O <sub>3</sub> –BaO–Fe <sub>2</sub> O <sub>3</sub> system
N.E. Volkova, K.S. Tolstov, L. Ya. Gavrilova, B. Raveau, A. Maignan, В.А. Черепанов
Abstract
Abstract Phase equilibria in the ½ Sm 2 O 3 –BaO–½ Fe 2 O 3 system were systematically studied at 1100°C in air. Two individual compounds: Sm 1.875 Ba 3.125 Fe 5 O 15‐δ and Ba 3 SmFe 2 O 7.5+δ have been detected in the studied system at 1100°C in air. One more complex oxide with double perovskite structure SmBaFe 2 O 5+ w has been obtained under reduced oxygen partial pressure. Thermodynamic stability of SmBaFe 2 O 5+ w and its thermal stability in metastable state in air were determined. The subsolidus phase diagram for the ½ Sm 2 O 3 – BaO – ½ Fe 2 O 3 system at 1100°C in air has been constructed.
Topics & Concepts
Phase diagramMetastabilityPerovskite (structure)Phase (matter)Thermal stabilityPartial pressureThermodynamicsOxygenChemistryOxideAnalytical Chemistry (journal)MineralogyChemical stabilityMaterials scienceCrystallographyPhysicsOrganic chemistryChromatographyAdvancements in Solid Oxide Fuel CellsMagnetic and transport properties of perovskites and related materialsMicrowave Dielectric Ceramics Synthesis