Electromagnetic properties of electrophoretic YBa2Cu3O7?? films
| Autor: | S. Kraut, D. Opie, L. Ponto, M. Peiniger, E. Mahner, M. Becks, Helmut Piel, D. Wehler, Matthias Hein, G. Müller, U. Klein |
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| Rok vydání: | 1990 |
| Předmět: |
Superconductivity
High-temperature superconductivity Materials science Physics and Astronomy (miscellaneous) business.industry Hydrogen maser Condensed Matter Physics Grain size Electronic Optical and Magnetic Materials law.invention Electrical resistance and conductance law Electromagnetic shielding Optoelectronics business Sheet resistance Microwave |
| Zdroj: | Journal of Superconductivity. 3:323-329 |
| ISSN: | 1572-9605 0896-1107 |
| DOI: | 10.1007/bf00625275 |
| Popis: | In order to apply highTc superconductivity to general microwave cavities and to shielding devices for quasistationary magnetic fields, we have developed an electrophoretic coating technique. This work reports about the continuation of our experiments. More than 60 samples of electrophoretic layers deposited on silver substrates were fabricated by systematically varying the processing parameters. The r.f. surface resistance measured at 21.5 GHz and 77 K at low excitation fields is found to be a sensitive measure of the quality of the samples and falls rapidly with increasing average grain size. Textured electrophoretic layers of large grain size show the smallest sensitivity ofRs against the r.f. surface magnetic fieldHs. The magnetic sensitivitydRs/dHs is found to be in direct proportion toRs (77 K). After optimizing the sintering procedure the electrodes of the prototype cavity for a compact hydrogen maser were coated. The cavity was successfully operated at 1.42 GHz, and a surface resistance of 1 mΩ was achieved at 77 K. This compares to 4 mΩ for copper at the same temperature. |
| Databáze: | OpenAIRE |
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