Study on dielectric properties of Sr2Bi5FeTi5O21 ceramic
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School of Civil Engineering and Architecture,University of Jinan,Jinan,,School of Material Science and Engineering,Shandong Jianzhu University,Jinan,,Shandong Women''s University
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Abstract:
Sr2Bi5FeTi5O21(SBFTi) ceramic was prepared by sol-gel self method. The dielectric constant-temperatures from room temperature to 500 ℃, AC impedance and AC conductivity of SBFTi ceramic were tested and analyzed. The results showed that SBFTi ceramic exhibit high dielectric constant, good frequency stability and high Curie temperature compared with Sr2Bi4Ti5O18(SBTi) ceramic and it also exhibit characteristics of diffuse ferroelectrics. The electrical structure of SBFTi ceramics was relatively uniform and the macro resistance, which was attributed to the grain show negative coefficient characteristic with temperature. The activation energies for conductivity was 0.6eV and the oxygen vacancy is the main carrier of the SBFTi ceramic at 200~480℃.
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[Wang Lingxu, Guo Xiaodong, Zhang Fengqing, Sun Huajun, Fan Suhua. Study on dielectric properties of Sr2Bi5FeTi5O21 ceramic[J]. Rare Metal Materials and Engineering,2018,47(S1):415~419.] DOI：[doi]