Crystal structure, oxygen nonstoichiometry and thermal expansion of ordered Y2Ba3Fe3.1Co1.9O13+δ
| Autor: | Vladimir A. Cherepanov, A.S. Urusova, A.S. Vizner, A. V. Bryuzgina, M. Yu. Mychinko |
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| Rok vydání: | 2019 |
| Předmět: |
Diffraction
Materials science Mechanical Engineering Analytical chemistry chemistry.chemical_element 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oxygen Thermal expansion 0104 chemical sciences Tetragonal crystal system Electron diffraction chemistry Mechanics of Materials Supercell (crystal) General Materials Science 0210 nano-technology Superstructure (condensed matter) |
| Zdroj: | Materials Letters. 251:78-80 |
| ISSN: | 0167-577X |
| Popis: | Single phase Y2Ba3Fe3.1Co1.9O13+δ was prepared at 1373 K in air. According to X-ray diffraction (XRD) it possesses the tetragonal structure (sp.gr. P4/mmm); the unit cell parameters are: a = 3.895(1)A; c = 19.372(1)A. Electron diffraction has shown the presence of 5-fold superstructure corresponding to the «ap × ap × 5ap» supercell. The oxygen content in Y2Ba3Fe3.1Co1.9O13+δ in air changes from 13.21 at room temperature down to 12.88 at 1390 K and average linear thermal expansion coefficient is equal to (15.4 ± 0.1) × 10−6 K−1 within the range of 298–1273 K in air. |
| Databáze: | OpenAIRE |
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