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Mejora de la conductividad de iones de óxido en delta-Bi2O3 estabilizado
Rita Punn1, Antonio M Feteira, Derek C Sinclair
1School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, UK.
Journal of the American Chemical Society
|November 30, 2006
Resumen
Los nuevos materiales de óxido de bismuto sustituido por renio (Bi2O3) con iones lantánidos exhiben una alta conductividad de iones de óxido. Estas nuevas fases delta-Bi2O3 ofrecen potencial para aplicaciones electroquímicas avanzadas.
Área de la Ciencia:
- Química del estado sólido.
- Ciencia de los materiales ciencia de los materiales.
- La electroquímica es electroquímica.
Sus antecedentes:
- El óxido de bismuto (Bi2O3) es conocido por su potencial en las pilas de combustible de óxido sólido.
- Estabilizar la fase delta-Bi2O3 de alta conductividad a temperaturas más bajas sigue siendo un desafío.
Objetivo del estudio:
- Para investigar la estabilización de la estructura delta-Bi2O3.
- Para explorar la conductividad de iones de óxido de nuevas fases sustituidas.
Principales métodos:
- Síntesis en estado sólido de Bi2O3.3, sustituido por renio y lantánido.
- Caracterización estructural mediante difracción de rayos X. Caracterización estructural mediante difracción de rayos X.
- Espectroscopia de impedancia electroquímica para medir la conductividad iónica.
Principales resultados:
- Se han sintetizado con éxito nuevas fases delta-Bi2O3 con composiciones como Bi12.5La1.5ReO24.5.5.
- Se observó una conductividad de iones de óxido excepcionalmente alta (aprox. 10-3 S cm-1 a 300°C). también se conoce como
- Se identificaron desviaciones estructurales significativas de las posiciones ideales de la fluorita en los sitios de aniones intersticiales.
Conclusiones:
- La co-sustitución de renio y lantánido estabiliza efectivamente la fase delta-Bi2O3.
- Estos nuevos materiales demuestran una conductividad iónica prometedora a bajas temperaturas de funcionamiento.
- Las características estructurales únicas están vinculadas a las propiedades mejoradas de transporte de iones.
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