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材料研究学报  2006, Vol. 20 Issue (1): 87-92    
  论文 本期目录 | 过刊浏览 |
CaCu3Ti4O12多晶块材的巨介电常数
任清褒
丽水学院物理系;丽水323000
引用本文:

任清褒 . CaCu3Ti4O12多晶块材的巨介电常数[J]. 材料研究学报, 2006, 20(1): 87-92.

全文: PDF(673 KB)  
摘要: 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300 K、频率为1 kHz时, ε高达14000; 在1 kHz、100~340 K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1 kHz交流电场作用下,温度低于100 K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.
关键词 无机非金属材料CaCu3Ti4O12多晶块材    
Key words
收稿日期: 1900-01-01     
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