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The phase equilibria in the Y – Ba – Fe – O system were systematically studied at 1373 K in air. The intermediate phases formed in the Y – Ba – Fe – O system at 1373 K in air were: Ba3YFe2O7.5+δ and BaFe1-xYxO3-δ. The combined X-ray diffraction and electron microscopy show that Ba3YFe2O7.5+δ exhibits the monoclinic structure a = 7.976(1) Å, b = 5.988(1) Å, c = 18.408(1) Å, β = 90.028 (sp. gr. P2/c),...
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