Abstract
The study of 96 samples of various compositions (x, y) in the Ba1−xPrxFe1−yCoyO3−δ system, prepared in air by the glycerol-nitrate method, made it possible to establish the compositional boundaries of stability for three types of crystal structure: 1) layered 112-type PrBaCo2−yFeyO5+δ (x = 0.5; 0 ≤ y ≤ 0.6) A-site ordered perovskite, 2) cubic perovskite phase (SG Pm-3m) within 0 ≤ x ≤ 0.6 and for which y depends on the Pr (x) content, and 3) orthorhombic phase (SG Pbnm) within 0.7 ≤ x ≤ 1. The unit cell parameters for the cubic and orthorhombic perovskites were refined by the Le-Bail or Rietveld analysis. The values of oxygen content, determined by the iodometric titration and TGA, are found to increase with Pr and Fe contents. The stability ranges for all three types of complex oxides, together with the multi-phase fields, were outlined for the room temperature conditions in a form of pseudo-phase diagram.
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