Electrical conduction properties of Sr-doped Bi4(SiO4)3 with the eulytite-type structure
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Electrical conduction in 1 mol% Sr-doped Bi4(SiO4)3 with the eulytite-type structure at elevated temperatures was investigated with conductivity measurements. Conductivity of the material under wet condition was higher than that under dry condition, and were 1.2 × 10−6 – 9.7 × 10−5 S cm−1 at 500–850 °C. From H/D isotope effects and p(O2)-dependencies of the conductivity, it was found that the Sr-doped Bi4(SiO4)3 exhibited protonic conduction at all the temperatures investigated while contribution of p-type conduction became significant with increasing p(O2) and/or temperature. Protonic and p-type conductions in the material were discussed in terms of defect equilibria.
KeywordsIsotope Effect Protonic Conduction Conductivity Ratio Electron Hole Oxygen Deficit
A part of this work was supported by Industrial Technology Research Grant Program in ’05 from New Energy and Industrial Technology Development Organization (NEDO) of Japan. The authors acknowledge Dr. H. Miyamoto at New Eco Material Co. Ltd., Kochi, Japan, and Mr. Y. Nishikawa at the Technology Research Institute of Osaka Prefecture, Japan, for their help on material preparation.