Synthesis of the giant dielectric constant oxide CaCu₃Ti₄O₁₂ via ethylenediaminetetraacetic acid precursor

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• 作者：Yanyan He ; Ting Liu ; Yebin Xu ; ^{xuyebin@yahoo.com} ; Jingyuan Zhao ; Zeming Du
• 关键词：A. Ceramics ; A. Electronic materials ; B. Chemical synthesis ; D. Dielectric properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：May, 2012
• 卷：47
• 期：5
• 页码：1181-1184
• 文件大小：500 K

摘要

CaCu₃Ti₄O₁₂ powders were prepared via EDTA route and single-phase CaCu₃Ti₄O₁₂ was obtained at 800 掳C for 2 h. DTA/TG and XRD were used to characterize the precursor and derived oxide powders. The dielectric properties of CaCu₃Ti₄O₁₂ ceramics were presented. Increasing sintering temperature leads to the increase in dielectric constant. CaCu₃Ti₄O₁₂ ceramics sintered at 1090 掳C for 3 h exhibited giant dielectric constant of up to 2.1 脳 10⁵ at room temperature and 100 Hz, which is significantly higher than those obtained from other chemical methods.