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 inMaterials research (São Carlos, São Paulo, Brazil) Vol. 16; no. 5; pp. 982 - 989
Main Authors Villas-Boas, L A, de, Souza D P F
Format Journal Article
LanguageEnglish
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
Densification
electrical characterization
Electrical conductivity
Electrical resistivity
ENGINEERING, CHEMICAL
Grain boundaries
lanthanum aluminate
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
Partial pressure
Resistivity
SOFC
solid electrolytes
Solid oxide fuel cells
space charge layer
Strontium
electrical characterization
space charge layer
lanthanum aluminate
SOFC
solid electrolytes
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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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ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/S1516-14392013005000087