The effect of Pr co-doping on the densification and electrical properties of Sr-LaAlO3
Perovskite-type materials have potential application as electrolyte materials for solid oxide fuel cells (SOFC) operating at low temperatures. LaAlO3-based perovskite, when adequately doped, has high ionic conductivity, but application as a solid electrolyte is limited due to low sinterability and p...
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Published in | Materials research (São Carlos, São Paulo, Brazil) Vol. 16; no. 5; pp. 982 - 989 |
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Main Authors | , |
Format | Journal Article |
Language | English Portuguese Spanish |
Published |
ABM, ABC, ABPol
01.09.2013
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
Subjects | |
Online Access | Get full text |
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Summary: | Perovskite-type materials have potential application as electrolyte materials for solid oxide fuel cells (SOFC) operating at low temperatures. LaAlO3-based perovskite, when adequately doped, has high ionic conductivity, but application as a solid electrolyte is limited due to low sinterability and p-type electronic conductivity in oxidising conditions. The effect of Pr co-doping on the densification and electrical conductivity of Sr-doped LaAlO3 was studied. The addition of Pr eliminates the problems affecting its application. Pr in solid solution acts as a perfect sintering aid because it promotes densification without forming a secondary phase which would be detrimental for electrical conduction. The addition of Pr also increases the bulk electrical conductivity measured in air atmosphere, but has no effect at low oxygen partial pressure. However, the addition of Pr has a strong effect on the grain boundary, improving the ionic grain boundary electrical conductivity at air which was attributed to the Pr influence on the space charge layer. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 1516-1439 1980-5373 1980-5373 |
DOI: | 10.1590/S1516-14392013005000087 |