Phase equilibria and crystal structures of complex oxides in systems La-M-Fe-O (M = Ca or Sr) |
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Authors: | L. Ya. Gavrilova T. V. Aksenova V. A. Cherepanov |
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Affiliation: | (1) Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russia |
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Abstract: | Phase equilibria in systems La-M-Fe-O (M = Ca or Sr) at 1100° in air were studied. The homogeneity ranges and structures of solid solutions La1 ? x M x FeO3 ? δ (0 ≤ x ≤ 0.3 for M = Ca and 0 ≤ x ≤ 0.8 for M = Sr), Sr2 ? y La y FeO4 ? δ (0.8 ≤ y ≤ 1.0), and Sr3 ? z La z Fe2O7 ? δ (0 ≤ z ≤ 0.2) were determined using X-ray powder diffraction. The structural parameters of complex oxides were refined using the full-profile Rietveld technique. Correlations between the unit cell parameters and the compositions of solid solutions were derived. Isobaric/isothermal phase diagrams were constructed for systems La-M-Fe-O (M = Ca or Sr) at 1100°C in air. |
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