Short-range structure of proton-conducting BaM0.10Zr0.90O2.95 (M = Y, In, Sc and Ga) investigated with vibrational spectroscopy
Journal article, 2010

The short-range structures of hydrated and dry samples of the proton-conducting, cubic-structured, acceptor-doped perovskites BaM0.10Zr0.90O2.95 (M=Y, In, Sc and Ga), and, for comparison, BaZrO3, have been investigated using infrared and Raman spectroscopy. The results show that the acceptor-doping leads to local structural distortions of the average cubic structure, most likely related to tilts of (M/Zr)O-6 octahedra, and that the distortions are most pronounced in the Ga-doped material for which we also find additional distortions upon hydration. For the Y-, In- and Sc-doped equivalents the distortions are somewhat weaker and hydration is found to have a reversed, although weak, effect. A comparison of the spectroscopic results to the reported proton diffusivities of the investigated materials would suggest that the much lower proton diffusivity in the Ga-doped material is associated to its stronger structural distortions. (C) 2009 Elsevier B.V. All rights reserved.



Infrared spectroscopy



Raman spectroscopy



M. Karlsson

Lund University

Istaq Ahmed

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Aleksandar Matic

Chalmers, Applied Physics, Condensed Matter Physics

Sten Eriksson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Solid State Ionics

0167-2738 (ISSN)

Vol. 181 3-4 (Sp. Iss.) 126-129

Subject Categories

Physical Sciences

Chemical Sciences



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