Phase equilibria, structure, oxygen nonstoichiometry, and thermal expansion of oxides in the 1/2Y₂O₃–SrO–1/2Fe₂O₃ system

Phase equilibria in the 1/2Y 2 O 3 –SrO–1/2Fe 2 O 3 system were systematically studied at 1373 K in air. The homogeneity ranges and crystal structure of the solid solutions Sr 1− x Y x FeO 3−δ with 0.875 ≤ x ≤ 1 (sp. gr. Pnma ) and 0.05 ≤ x ≤ 0.25 (sp. gr. Pm3 m ) and Sr 3− z Y z Fe 2 O 7−δ with 0 ≤ z ≤ 0.25 (sp. gr. I4/mmm ) were determined by X‐ray diffraction analysis of quenched samples. The structural parameters of the single‐phase oxides...