Bismuth-doping effect on structural properties and proton conductivity of pyrochlore-type antimonic acid
Abstract Bismuth-doped pyrochlore-type antimonic acids H 1−3 x Bi x SbO 3 · n H 2 O (0≤ x ≤0.28, n =0.5) were prepared by solution processing using the reaction of an aqueous H 2 O 2 solution with antimony and bismuth alkoxides, and their structural properties and proton conductivity were investigated. It was found that the Bi atoms are located in an interstitial 16d (1/2, 1/2, 1/2) site in the structure and that the proton conductivity of the doped material ( x =0.081) is enhanced by about two orders of magnitude compared to that of the pure material. The relationship between the proton conductivity and structural properties is discussed.