Complex Impedance Study of Fine and Coarse Grain TiO2 Ceramics
作者： Sheng Chao , Vladimir Petrovsky , Fatih Dogan
DOI: 10.1111/J.1551-2916.2010.04008.X
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摘要: Titanium dioxide (TiO2) ceramics with various grain sizes were investigated by impedance spectroscopy techniques. Dielectric loss peak identified in coarse TiO2 was attributed to space charge polarization occurring at the boundaries. Electric modulus representation of data showed two types relaxation processes TiO2, whereas only one type observed fine TiO2. Long-range migration oxygen vacancies found be dominant conduction mechanism for while electron hopping between localized states dielectric
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