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In a systematic study we investigate the effect of dopant level and hydrationon the short-range structure of the proton conducting perovskite-type oxideBaIn_{x}Zr_{1-x}O_{3-x/2} (x = 0-0.75), using infrared and Raman spectroscopy.The results show that doping leads to significant local distortions of theaverage cubic structure of these materials. By increasing the In concentrationfrom x = 0 to x = 0.75 new bands appear and grow in intensity in both the IRand Raman spectra, showing that the local distortions become successively moreand more pronounced. The structural distortions are largely uncorrelated to thepresence of oxygen vacancies, but instead are mainly driven by the sizedifference between the In^{3+} and Zr^{4+} ions, which leads to displacementsof the cations and to tilting of the (In/Zr)O_{6} octahedra. Based on ourresults, we suggest that there is a threshold between x = 0.10 and x = 0.25where the local structural distortions propagate throughout the wholeperovskite structure. Comparison of our spectroscopic data with the protonconductivity reported for the same materials indicates that the presence ofextended structural distortions are favorable for fast proton transport.

Short-range structure of proton conducting perovskite BaIn_{x}Zr_{1-x}O_{3-x/2} (x = 0-0.75)