Abstract
The bonding nature of hydroxide ions in two proton-conducting oxy-hydroxides, perovskite-type Ba(Zn0.4Ta0.6)O2.9−y(OH)2y (BZT) and double perovskite-type Ba(Zn0.55W0.45)O2.9−y(OH)2y (BZW), has been studied by Fourier transform infrared spectroscopy (FT-IR) at temperatures of 40–600 °C. A broad absorption peak at 2500−4000 cm−1 attributable to O–H stretching vibration was analyzed by deconvolution into four components, assigned as two symmetric (SC) and two asymmetric (AC) proton sites in the crystal lattice. The temperature variations of peak intensities revealed a difference in proton site preference between BZT and BZW, suggesting a crucial role of B-site cationic order in the proton distribution and, thereby, the proton conductive property.
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