Two step synthesis of TlBa2Ca2Cu3Ox films on Ag substrates by spray pyrolysis of metal-acetylacetonates
A two-step synthesis process was performed to obtain TlBa2Ca2Cu3Ox (Tl-1223) superconductor films. The synthesized films were obtainedunder different thallium diffusion conditions in a two-zone furnace precursor films were deposited at 550±C on silver substrates using the spray pyrolysis technique f...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | México |
| Institución: | Instituto Politécnico Nacional |
| Repositorio: | Repositorio Digital del IPN |
| OAI Identifier: | oai:www.repositoriodigital.ipn.mx:123456789/11483 |
| Acceso en línea: | http://hdl.handle.net/123456789/1029 http://www.repositoriodigital.ipn.mx/handle/123456789/11483 |
| Access Level: | acceso abierto |
| Palabra clave: | Superconductors Thin films Spray Pyrolysis. |
| Sumario: | A two-step synthesis process was performed to obtain TlBa2Ca2Cu3Ox (Tl-1223) superconductor films. The synthesized films were obtainedunder different thallium diffusion conditions in a two-zone furnace precursor films were deposited at 550±C on silver substrates using the spray pyrolysis technique from acetylacetonates (2, 4-pentanedionates) as reagents. Second, a thallium diffusion process is carried out to incorporate Tl in the films. For this task Tl2O3 pellets, as a Tl source, were used at 750±C. Different oxygen flow rates at atmospheric pressure were used in order to get the thallous oxide p(Tl2O) partial pressure in the range of 6:9£10¡4 to 6:1£10¡2 atm. The Tl-1223 phase was obtained in all cases, though for a low p(Tl2O), the films presented the BaCuO2 phase mixed with the Tl-1223 one. Critical temperature (TC) values for these films were in the range of 90 to 102 K. |
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