Abstract
Two different nonstoichiometric mixed perovskites: Sr 2(Sc 1+) xNb 1− xO 6−σ (with x=0.05 and 0.1) and Ba 3(Ca 1.18Nb 1.82)O 9−σ, are shown to become good high-temperature protonic conductors upon exposure to H 2O (or D 2O) atmospheres. Conductivity is studied in the temperature range of 300 ∼550 K where the proton concentration is frozen in. The activation energies E H for proton migration in these compounds are 0.62 and 0.54 eV, respectively. The conductivities fall in the same range as those for M 3+-doped SrCeO 3 and BaCeO 3, but the present materials do not show electronic conduction after treatment in highly reducing atmospheres as do the cerates. It is therefore concluded that these compounds deserve serious consideration as fast high-temperature protonic conductors.
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