采用固相反应法制备了不同化学计量比的CaCu_3Ti_4O_(12)(简称CCTO)陶瓷.当Ca、Cu、Ti的原子摩尔比为1.08:3.00:4.44时,获得了相对介电常数在1kHz下高达4×10~5(1kHz)的巨介电CCTO陶瓷,其介电常数比标准化学计量比CCTO陶瓷高约一个数量级.结合XRD、SEM、EDX等分析表征结果,对巨介电常数的物理机理进行了探讨.
Non-stoichiometry CaCu_3Ti_4O_(12)(CCTO)ceramics are prepared by the conventional solid-state reaction method.Relative dielectric constant of CCTO ceramics attain 4×10~5(1kHz) if the atoms mol ratio of Ca,Cu,Ti elements are 1.08:3.00:4.44.It is one magnitude higher than stoichiometry CCTO ceramics .Microstructures and crystalline structures and component analyzing are examined by scanning electronic microscopy (SEM),X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy(EDX),respectively.The giant dielectric constant mechanism of CCTO ceramics is discussed.
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