Effect of synthetic methods on the thermoelectrical properties of textured Bi2Ca2Co1.7Ox ceramics
Thermoelectric performances on cobaltite ceramics can be changed by grain orientation. This can be performed by directional solidification on samples prepared from different synthetic methods. Three synthetic methods, conventional solid state reaction, sol-gel and polymer solution were used for prep...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/52630 |
| Acceso en línea: | http://hdl.handle.net/10261/52630 |
| Access Level: | acceso abierto |
| Sumario: | Thermoelectric performances on cobaltite ceramics can be changed by grain orientation. This can be performed by directional solidification on samples prepared from different synthetic methods. Three synthetic methods, conventional solid state reaction, sol-gel and polymer solution were used for preparation of Bi2Ca2Co1.7Ox powders. The powders have been directionally grown, at a rate of 30 mm/h, by the laser floating zone method. In all the cases, the microstructure shows alternated layers, of Bi2Ca2Co2Ox and a Bi-Ca-O solid solution, with small CoO inclusions. It has been found an improvement on the power factor at 50 ºC for the solution methods with respect to the conventional solid sate sintered samples. |
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