期刊
SOLID STATE IONICS
卷 177, 期 26-32, 页码 2357-2362出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2006.05.030
关键词
neutron diffraction; structure; proton conductor; perovskite
The proton conductivity and structural features of In3+ substituted BaZrO3 samples, i.e., BaZr1-xInxO3-delta, were investigated. Rietveld analysis of low temperature (10K) neutron powder diffraction data collected on as-prepared and deuterated samples confirmed cubic symmetry (space group Pm-3m) for all compositions. The level of oxygen vacancies refined in the as-prepared samples were in good agreement with the values expected to conserve charge neutrality, whilst an increase in oxygen occupancy, reflecting the incorporation of OD- species, was obtained for the deuterated materials. An expansion of the unit cell parameter, a, was observed as a function of In3+ doping as well as after the deuteration reaction. The conductivity of pre-hydrated and dry samples was measured using impedance methods. For 25% In-doped BaZrO3, the low T (300 degrees C) conductivity of the heating cycle of the dried sample was greater than that of the cooling cycle of the pre-hydrated sample indicating a greater number of protons in the nominally dry sample. In contrast, the conductivity values were similar at higher temperatures e.g. T > 500 degrees C where proton conduction is not dominant. (c) 2006 Elsevier B.V. All rights reserved.
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