Superior oxygen ion conductivity of lanthanum gallate doped with strontium and magnesium
- McMaster Univ., Hamilton, Ontario (Canada). Dept. of Materials Science and Engineering
The solid solution range of the La(Sr)Ga(Mg)O{sub 3} perovskite was investigated and the oxygen ion conductivities of corresponding compositions were measured. The solubility of strontium could be extended by the addition of magnesium ions to establish a balance in the oxygen vacancies associated with A and B sites. In this way, the Sr limit in the solid solution was increased to more than 20% of the La content. Doping with either Sr or Mg enhanced oxygen ion conductivity, but whereas Sr doping yielded decreased activation energy with increasing concentration, Mg produced a higher activation energy with increased Mg content. La{sub 0.8}Sr{sub 0.2}Ga{sub 0.9}Mg{sub 0.1}O{sub 2.85} was found to have the highest conductivity apart from CeO{sub 2}-based electrolytes at temperatures below 700 C, while La{sub 0.8}Sr{sub 0.2}Ga{sub 0.85}Mg{sub 0.15}O{sub 2.825} has the highest conductivity except for Bi{sub 2}O{sub 3} at temperatures above 700 C.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 256820
- Journal Information:
- Journal of the Electrochemical Society, Vol. 143, Issue 5; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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