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Phase equilibria in the Y-Ba-Fe-O system

Abstract : 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+delta and BaFe1-xYxO3-delta. The combined X-ray diffraction and electron microscopy show that Ba3YFe2O7.5+delta exhibits the monoclinic structure a = 7.976(1) angstrom, b = 5.988(1) angstrom, c = 18.408(1) angstrom, beta = 90.028 (sp. gr. P2/c), which in the first approximation can be described as the orthorhombic structure with a tiny monoclinic distortion. High-temperature XRD of BaFeO3-delta within the temperature range 298-1273 K in air demonstrates a single phase with the orthorhombic structure (sp. gr. P2(1)2(1)2) that appears below 673 K, a single phase cubic BaFeO3-delta (sp. gr. Pm3m) that forms at temperature above 1273 K, and a mixture of two phases mentioned above that coexisted within 673-1273 K. These correlate with the results obtained by TGA and dilatometry methods. The substitution of yttrium for iron in BaFe1-xYxO3-delta leads to the formation of solid solutions with the cubic structure in air within (0.075 < x < 0.125) for slowly cooled samples. The homogeneity range has extended at 1373 K towards undoped BaFeO3-delta. The projection of isothermal isobaric phase diagram for the Y - Ba - Fe - O system at 1373 K in air to the compositional triangle of metallic components has been constructed. (C) 2016 Elsevier B.V. All rights reserved.
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Submitted on : Friday, July 5, 2019 - 5:00:22 PM
Last modification on : Tuesday, September 10, 2019 - 10:03:00 AM

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A. S. Urusova, A. V. Bryuzgina, M. Yu Mychinko, N. E. Mordvinova, O. I. Lebedev, et al.. Phase equilibria in the Y-Ba-Fe-O system. Journal of Alloys and Compounds, Elsevier, 2017, 694, pp.375-382. ⟨10.1016/j.jallcom.2016.10.023⟩. ⟨hal-02175394⟩

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