Silica-scavenging effects in ceria-based solid electrolytes
Composite materials based on gadolinium doped ceria (CGO) with additions of silica, with both silica and lanthanum oxide, and with lanthanum silicate, were prepared by the conventional ceramic route, to assess the silica scavenging role of lanthanum oxide additions. Structural, microstructural and e...
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| Format: | Article |
| Language: | English |
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Elsevier
2008-08-01
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| Series: | Boletín de la Sociedad Española de Cerámica y Vidrio |
| Subjects: | |
| Online Access: | http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/175/190 |
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| author | Ivanova, D. Kovalevsky, A. Kharton, V. V. Marques, F. M. |
| author_facet | Ivanova, D. Kovalevsky, A. Kharton, V. V. Marques, F. M. |
| author_sort | Ivanova, D. |
| collection | DOAJ |
| description | Composite materials based on gadolinium doped ceria (CGO) with additions of silica, with both silica and lanthanum oxide, and with lanthanum silicate, were prepared by the conventional ceramic route, to assess the silica scavenging role of lanthanum oxide additions. Structural, microstructural and electrical characterization of these samples confirmed the formation of one apatite type lanthanum silicate-based phase from reaction of silica with lanthanum oxide. The formation of this phase occurred in parallel with a significant enhancement of the grain boundary conductivity of these composite materials. Further interaction between constituents, involving diffusion of La to CGO, and Ce and Gd to the apatite phase, had no significant consequences on the electrical performance of these materials. Overall, lanthanum oxide was shown to remove the siliceous phases from the grain boundaries of CGO.<br><br>Se prepararon materiales compuestos basados en óxido de cerio dopado con gadolinio (TGO) con adicciones de sílice, con sílice y óxido de lantano y silicato del lantano, mediante procesamiento cerámico convencional con objeto de confirmar el papel secuestrante de sílice de las adicciones. La caracterización estructural, microestructural y eléctrica de las muestras confirmó la formación de una fase tipo apatito basada en silicato de lantano a partir de la reacción de la sílice con el óxido de lantano. La formación de esta fase ocurre en paralelo con un incremento significativo de la conductividad a través del borde de grano de estos materiales. La interacción entre los constituyentes, incluyendo la difusión del La al CGO, y el Ce y el Gd a la fase apatito, no tiene consecuencias significativas sobre el comportamiento eléctrico de estos materiales. Resumiendo, el óxido de lantano es capaz de eliminar las fases silicias del borde de grano del CGO. |
| first_indexed | 2024-12-11T09:21:54Z |
| format | Article |
| id | doaj.art-d72323a4c82d4aa99951984e66818cd5 |
| institution | Directory Open Access Journal |
| issn | 0366-3175 |
| language | English |
| last_indexed | 2024-12-11T09:21:54Z |
| publishDate | 2008-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Boletín de la Sociedad Española de Cerámica y Vidrio |
| spelling | doaj.art-d72323a4c82d4aa99951984e66818cd52022-12-22T01:13:15ZengElsevierBoletín de la Sociedad Española de Cerámica y Vidrio0366-31752008-08-01474201206Silica-scavenging effects in ceria-based solid electrolytesIvanova, D.Kovalevsky, A.Kharton, V. V.Marques, F. M.Composite materials based on gadolinium doped ceria (CGO) with additions of silica, with both silica and lanthanum oxide, and with lanthanum silicate, were prepared by the conventional ceramic route, to assess the silica scavenging role of lanthanum oxide additions. Structural, microstructural and electrical characterization of these samples confirmed the formation of one apatite type lanthanum silicate-based phase from reaction of silica with lanthanum oxide. The formation of this phase occurred in parallel with a significant enhancement of the grain boundary conductivity of these composite materials. Further interaction between constituents, involving diffusion of La to CGO, and Ce and Gd to the apatite phase, had no significant consequences on the electrical performance of these materials. Overall, lanthanum oxide was shown to remove the siliceous phases from the grain boundaries of CGO.<br><br>Se prepararon materiales compuestos basados en óxido de cerio dopado con gadolinio (TGO) con adicciones de sílice, con sílice y óxido de lantano y silicato del lantano, mediante procesamiento cerámico convencional con objeto de confirmar el papel secuestrante de sílice de las adicciones. La caracterización estructural, microestructural y eléctrica de las muestras confirmó la formación de una fase tipo apatito basada en silicato de lantano a partir de la reacción de la sílice con el óxido de lantano. La formación de esta fase ocurre en paralelo con un incremento significativo de la conductividad a través del borde de grano de estos materiales. La interacción entre los constituyentes, incluyendo la difusión del La al CGO, y el Ce y el Gd a la fase apatito, no tiene consecuencias significativas sobre el comportamiento eléctrico de estos materiales. Resumiendo, el óxido de lantano es capaz de eliminar las fases silicias del borde de grano del CGO.http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/175/190Ceriascavenging effectsilicagrain boundaryCeriaefecto secuestrantesíliceborde de grano |
| spellingShingle | Ivanova, D. Kovalevsky, A. Kharton, V. V. Marques, F. M. Silica-scavenging effects in ceria-based solid electrolytes Boletín de la Sociedad Española de Cerámica y Vidrio Ceria scavenging effect silica grain boundary Ceria efecto secuestrante sílice borde de grano |
| title | Silica-scavenging effects in ceria-based solid electrolytes |
| title_full | Silica-scavenging effects in ceria-based solid electrolytes |
| title_fullStr | Silica-scavenging effects in ceria-based solid electrolytes |
| title_full_unstemmed | Silica-scavenging effects in ceria-based solid electrolytes |
| title_short | Silica-scavenging effects in ceria-based solid electrolytes |
| title_sort | silica scavenging effects in ceria based solid electrolytes |
| topic | Ceria scavenging effect silica grain boundary Ceria efecto secuestrante sílice borde de grano |
| url | http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/175/190 |
| work_keys_str_mv | AT ivanovad silicascavengingeffectsinceriabasedsolidelectrolytes AT kovalevskya silicascavengingeffectsinceriabasedsolidelectrolytes AT khartonvv silicascavengingeffectsinceriabasedsolidelectrolytes AT marquesfm silicascavengingeffectsinceriabasedsolidelectrolytes |