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OALib Journal期刊
ISSN: 2333-9721
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cacu3ti4o12多晶块材的巨介电常数
Keywords: 无机非金属材料,cacu3ti4o12多晶块材
Abstract:
？采用固相反应法制备了cacu3ti4o12单相多晶块材,系统地研究了其介电常数与温度(ε(t))和频率(ε(f))的依赖关系.结果表明,cacu3ti4o12多晶块材在温度为300k、频率为1khz时,ε高达14000;在1khz、100~340k温区内ε的数值基本不变.cacu3ti4o12多晶块材的介电特性很难用位移型铁电体的相关理论描述,可能源于在纳米尺度的畴区内极化弛豫的动态变化.在1khz交流电场作用下,温度低于100k时,cacu3ti4o12多晶块材ε的急剧下降与其中氧空位引起ti离子变价所产生的极化子的热激活相关.
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