Abstract
In order to clarify the effect of the B site species in ABO3 perovskite oxides on the proton transport properties, the proton incorporation into a series of La0.9Sr0.1MO3-δ, (M=Al, Sc, In, Yb, Y) was studied by measuring the electrical conductivity and electromotive forces of the gas concentration cells, and by a thermogravimetric analysis. The proton concentration and electrical conductivity increased in the order of the B site species, Al<Y=Yb<Sc<In and Al<Y=Yb<In<Sc, respectively. La0.9Sr0.1AlO3-δ showed an oxide ion conductivity, while La0.9Sr0.1YbO3-δ and La0.9Sr0.1YO3-δ exhibited a protonic conductivity in the temperature range of 573–1173K. La0.9Sr0.1ScO3-δ and La0.9Sr0.1InO3-δ showed a protonic conductivity under 873K, and a mixed proton and oxide ion conductivity at 1073K.
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