Stability of AB{prime}{sub 1/2}B{double{underscore}prime}{sub 1/2}O{sub 3} mixed perovskite proton conductors
Several mixed perovskites of the type A{sub 2}B{prime}B{double{underscore}prime}O{sub 6} (AB{prime}{sub 1/2}B{double{underscore}prime}{sub 1/2}O{sub 3}), where A is Ba{sup +2} and B{prime} and B{double{underscore}prime} are trivalent and pentavalent ions, respectively, were synthesized by calcining requisite mixtures of BaCO{sub 3}, B{prime}{sub 2}O{sub 3}, and B{double{underscore}prime}{sub 2}O{sub 5} in air. X-ray diffraction confirmed the formation of the perovskite phase in each of the samples synthesized. The as-calcined powders were boiled in water to examine their stabilities in water. All mixed perovskites were found to be stable. By contrast, BaCeO{sub 3} and BaPrO{sub 3} decomposed when boiled in water while BaZrO{sub 3} was found to be stable. Madelung energies of simple and mixed perovskites were computed. The higher stability of mixed perovskites compared to simple perovskites of the type ABO{sub 3}, such as BaCeO{sub 3} and BaPrO{sub 3}, where B is a tetravalent ion, was rationalized on the basis of lower Madelung energies of mixed perovskites.
- Research Organization:
- Univ. of Utah, Salt Lake City, UT (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG03-97ER45661
- OSTI ID:
- 20013025
- Journal Information:
- Journal of the Electrochemical Society, Vol. 146, Issue 12; Other Information: PBD: Dec 1999; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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