Phase equilibria in the Y–Ba–Fe–O system
| Autor: | O. I. Lebedev, Vincent Caignaert, A. V. Bryuzgina, T. V. Aksenova, E.A. Kiselev, M. Yu. Mychinko, Vladimir A. Cherepanov, A.S. Urusova, Natalia E. Mordvinova |
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| Přispěvatelé: | Ural Federal University [Ekaterinburg] (UrFU), Department of Chemistry, Lomonosov Moscow State University, Lomonosov Moscow State University (MSU), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC), Ministry of Education and Science of RF [1039], Act 211 Government of the Russian Federation [02.A03.21.0006], Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Oxygen nonstoichiometry Metal [CHIM.CRIS]Chemical Sciences/Cristallography Materials Chemistry [CHIM]Chemical Sciences Phase diagram Oxide materials Mechanical Engineering Metals and Alloys [CHIM.MATE]Chemical Sciences/Material chemistry Yttrium Atmospheric temperature range 021001 nanoscience & nanotechnology X-ray diffraction 0104 chemical sciences [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry Crystallography chemistry Mechanics of Materials visual_art X-ray crystallography TEM visual_art.visual_art_medium Orthorhombic crystal system 0210 nano-technology Solid solution Monoclinic crystal system |
| Zdroj: | Journal of Alloys and Compounds Journal of Alloys and Compounds, Elsevier, 2017, 694, pp.375-382. ⟨10.1016/j.jallcom.2016.10.023⟩ Journal of Alloys and Compounds, 2017, 694, pp.375-382. ⟨10.1016/j.jallcom.2016.10.023⟩ |
| ISSN: | 0925-8388 |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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