Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria
[EN] The goal of this work was to study the thermal expansion behaviour and to establish the phase relations between NdMe0.5Mn0.5O3 (Me=Ni, Co) solid solutions as cathodes and two electrolytes based on Ce0.9Gd0.1O1.95. Doping of electrolyte with 1.0 wt% Bi2O3 was employed in order to improve the den...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2008 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/6447 |
| Acceso en línea: | http://hdl.handle.net/10261/6447 |
| Access Level: | acceso abierto |
| Palabra clave: | CeO2-Gd2O3 Manganites Manganites, thermal compatibility Chemical compatibility Manganitas Compatibilidad química Compatibilidad termomecánica |
| Sumario: | [EN] The goal of this work was to study the thermal expansion behaviour and to establish the phase relations between NdMe0.5Mn0.5O3 (Me=Ni, Co) solid solutions as cathodes and two electrolytes based on Ce0.9Gd0.1O1.95. Doping of electrolyte with 1.0 wt% Bi2O3 was employed in order to improve the densification process. The cathode-electrolyte pairs were obtained by isostatic pressing of constituent powders and posterior sintering using the temperature ranges between 1350–1400 ºC for 2 h. The sintering conditions were optimized to obtain highly densificated electrolytes and well-developed cathode-electrolyte interfaces. Scanning electron microscopy observation with EDAX analysis was performed in cathode-electrolyte interfacial regions in order to characterize the obtained microstructures and to determine possible cation diffusions from the cathode into the electrolyte. It is found that the nickel doped manganite, NdNi0.5Mn0.5O3, is chemically and thermo-mechanically compatible with both electrolytes without formation of new phases up to 1400ºC even during long time of treatments. |
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