Oxygen evolution from ABa2Cu3O7−δ high-Tc superconductors with A=Yb, Er, Y, Gd, Eu, Sm, Nd and La
| Autor: | K. Kopitzki, D. Wagener, S.M. Hosseini, P. Herzog, M. Buchgeister |
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| Rok vydání: | 1991 |
| Předmět: |
Materials science
High-temperature superconductivity Ionic radius Gas evolution reaction Oxygen evolution Energy Engineering and Power Technology Crystal structure Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Chemical bond law X-ray crystallography Physical chemistry Electrical and Electronic Engineering Powder diffraction |
| Zdroj: | Physica C: Superconductivity. 178:105-109 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(91)90164-t |
| Popis: | Ceramic samples of high- T c superconductors (HTSCs) of the type ABa 2 Cu 3 O 7− δ with A=Yb, Er, Y, Gd, Eu, Sm, Nd and La were prepared to investigate the bonding of the oxygen atoms of the CuO-chains in these compounds by gas evolution measurements. The desorption frequency and the activation energy of these oxygen atoms show a linear dependence on the ionic radius of the A atom. The results are related to the orthorhombicity of the crystal structure of the samples determined from X-ray powder diffraction patterns by Rietveld profile refinements. |
| Databáze: | OpenAIRE |
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