CAJ | 학술논문

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.
채용고상반응법제비료불동화학계량비적CaCu_3Ti_4O_(12)(간칭CCTO)도자.당Ca、Cu、Ti적원자마이비위1.08:3.00:4.44시,획득료상대개전상수재1kHz하고체4×10~5(1kHz)적거개전CCTO도자,기개전상수비표준화학계량비CCTO도자고약일개수량급.결합XRD、SEM、EDX등분석표정결과,대거개전상수적물리궤리진행료탐토.
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.