Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria
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 densific...
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doaj-4b66dce9ab8b42f49ebb983be1ff76982020-11-24T23:59:46ZengElsevierBoletín de la Sociedad Española de Cerámica y Vidrio0366-31752008-06-01473171177Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceriaGil, V.Tartaj, J.Moure, C.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.<br><br>El propósito del presente trabajo es establecer las relaciones de fase entre soluciones sólidas NdMe0.5Mn0.5O3 (Me=Ni, Co) y electrolitos Ce0.9Gd0.1O1.95 para su uso como cátodos y electrolitos SOFC, respectivamente. El electrolito fue en ocasiones dopado con 1.0 wt% Bi2O3 con el objeto de mejorar su densificación. Así mismo se estudia el comportamiento termomecánico de dichos materiales. Los pares cátodo-electrolito fueron obtenidos a partir de polvos prensados isostáticamente y posteriormente sinterizados utilizando unos rangos de temperatura entre 1350 y 1400ºC durante 2h. Las condiciones de sinterización fueron optimizadas para obtener unos electrolitos altamente densificados y unas interfaces cátodo-electrolito bien definidas. La caracterización microestructural de las regiones interfaciales fue llevada a cabo mediante microscopía electrónica de barrido, además se realizaron análisis EDAX para determinar posibles fenómenos de difusión catiónica desde o hacia el catódo. Se puede concluir que la manganita dopada con níquel, NdNi0.5Mn0.5O3, es compatible química y termomecánicamente con los electrolitos basados en ceria, sin formación de nuevas fases incluso después de largos tiempos de tratamiento a 1400ºC.http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/196/209CeO2-Gd2O3manganitesthermal compatibilitychemical compatibilityCeO2-Gd2O3manganitascompatibilidad químicacompatibilidad termomecánica |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Gil, V. Tartaj, J. Moure, C. |
spellingShingle |
Gil, V. Tartaj, J. Moure, C. Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria Boletín de la Sociedad Española de Cerámica y Vidrio CeO2-Gd2O3 manganites thermal compatibility chemical compatibility CeO2-Gd2O3 manganitas compatibilidad química compatibilidad termomecánica |
author_facet |
Gil, V. Tartaj, J. Moure, C. |
author_sort |
Gil, V. |
title |
Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria |
title_short |
Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria |
title_full |
Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria |
title_fullStr |
Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria |
title_full_unstemmed |
Chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria |
title_sort |
chemical and thermomechanical compatibility between neodymium manganites and electrolytes based on ceria |
publisher |
Elsevier |
series |
Boletín de la Sociedad Española de Cerámica y Vidrio |
issn |
0366-3175 |
publishDate |
2008-06-01 |
description |
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.<br><br>El propósito del presente trabajo es establecer las relaciones de fase entre soluciones sólidas NdMe0.5Mn0.5O3 (Me=Ni, Co) y electrolitos Ce0.9Gd0.1O1.95 para su uso como cátodos y electrolitos SOFC, respectivamente. El electrolito fue en ocasiones dopado con 1.0 wt% Bi2O3 con el objeto de mejorar su densificación. Así mismo se estudia el comportamiento termomecánico de dichos materiales. Los pares cátodo-electrolito fueron obtenidos a partir de polvos prensados isostáticamente y posteriormente sinterizados utilizando unos rangos de temperatura entre 1350 y 1400ºC durante 2h. Las condiciones de sinterización fueron optimizadas para obtener unos electrolitos altamente densificados y unas interfaces cátodo-electrolito bien definidas. La caracterización microestructural de las regiones interfaciales fue llevada a cabo mediante microscopía electrónica de barrido, además se realizaron análisis EDAX para determinar posibles fenómenos de difusión catiónica desde o hacia el catódo. Se puede concluir que la manganita dopada con níquel, NdNi0.5Mn0.5O3, es compatible química y termomecánicamente con los electrolitos basados en ceria, sin formación de nuevas fases incluso después de largos tiempos de tratamiento a 1400ºC. |
topic |
CeO2-Gd2O3 manganites thermal compatibility chemical compatibility CeO2-Gd2O3 manganitas compatibilidad química compatibilidad termomecánica |
url |
http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/196/209 |
work_keys_str_mv |
AT gilv chemicalandthermomechanicalcompatibilitybetweenneodymiummanganitesandelectrolytesbasedonceria AT tartajj chemicalandthermomechanicalcompatibilitybetweenneodymiummanganitesandelectrolytesbasedonceria AT mourec chemicalandthermomechanicalcompatibilitybetweenneodymiummanganitesandelectrolytesbasedonceria |
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