Oxygen diffusion in Y1Ba2Cu3O7-δ grains: An experimental study of ozone and oxygen annealing processes
| Autor: | James R. Gaines, Yi Song, X. D. Chen, John W. Gilje |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Superconductivity
Ozone Materials science Annealing (metallurgy) Mechanical Engineering Inorganic chemistry chemistry.chemical_element Thermodynamics Condensed Matter Physics Oxygen chemistry.chemical_compound chemistry Mechanics of Materials Electrical resistivity and conductivity Oxidizing agent Oxygen diffusion General Materials Science Crystallite |
| Zdroj: | Journal of Materials Research. 5:27-32 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.1990.0027 |
| Popis: | By monitoring the electrical resistivity of single phase polycrystalline Y1Ba2Cu3O7-δ samples while changing their oxygen content in both ozone and ordinary oxygen environments, we were able to investigate the correlation between their average oxygen content and the diffusion time for oxygen inside the grains. We model the resistivity time dependence as a two-step process and find that this explains our experimental results satisfactorily. From this model we are able to estimate a value of the oxygen diffusion coefficient from our data that agrees well with other measurements. We also conclude that while ozone and ordinary oxygen may have different effects in oxidizing the surface of grains, they show no observable differences in the oxygen diffusion process in the bulk Y1Ba2Cu3O7-δ material. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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