| Autor: |
Claude J.A. Monty, René Maury, J. Sabras, J. Ayache, C. Dolin, A. Fert |
| Rok vydání: |
1990 |
| Předmět: |
|
| Zdroj: |
Le Journal de Physique Colloques. 51:C1-1035 |
| ISSN: |
0449-1947 |
| DOI: |
10.1051/jphyscol:19901161 |
| Popis: |
Polycristal1ine YBa2Cu3O7-x samples with different grain size have been elaborated by sintering. Magnetic properties exhibit a strong dependence on grain size. Oxygen self-diffusion experiments in some of the samples show that this process is highly anisotropic. The diffusion profiles measured by SIMS are influenced by short-circuit effects, they are well-fitted by a grain-boundary diffusion solution. Nevertheless microstructure studies show that beside grain-boundaries few other extended defects (microcracks, thick and heterogeneous intergranular phases...) are present in the samples. Slowest volume diffusion coefficients and grain-boundary diffusion coefficients have been determined. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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