A family of non-stoichiometric phases based on Ba2YCu3O7−δ (0≤δ≤1)
| Autor: | Miguel Á. Alario-Franco, J. J. Capponi, J. Chenavas, M. Marezio, Catherine Chaillout |
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| Rok vydání: | 1988 |
| Předmět: |
Superconductivity
Materials science Energy Engineering and Power Technology chemistry.chemical_element Composition (combinatorics) Condensed Matter Physics Oxygen Electronic Optical and Magnetic Materials Well differentiated Crystallography Homologous series chemistry.chemical_compound chemistry Electron diffraction Electrical and Electronic Engineering Stoichiometry Phase diagram |
| Zdroj: | Physica C: Superconductivity. 156:455-460 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(88)90771-x |
| Popis: | In the light of recent electron diffraction evidence a reappraisal is made of the problem of non-stoichiometry by oxygen deficiency in high-temperature superconducting Ba 2 YCu 3 O 7−δ . On the basis of the ordered states of the oxygen vacancies detected by that technique, a family of phases is proposed as a better description of oxygen stoichiometry and compositional variations in that material. Five phases appear to exist within the usually considered range 0≤δ≤1. All of these phases, which can be considered as consecutive members of a homologous series differing in oxygen content along the CuO rows running along the b axis, are themselves non-stoichiometric and appear to correspond to well differentiated regions in the characteristic T c versus composition phase diagram found by several authors. |
| Databáze: | OpenAIRE |
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