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首页> 外文期刊>Asia-Pacific Journal of Science and Technology >Giant dielectric, low loss tangent and non-ohmics properties of CaCu3Ti4.7O12 ceramics prepared by polymer pyrolysis method
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Giant dielectric, low loss tangent and non-ohmics properties of CaCu3Ti4.7O12 ceramics prepared by polymer pyrolysis method

机译：聚合物热解法制备CaCu3Ti4.7O12陶瓷的介电，低损耗正切和非欧姆特性

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摘要

In this work, CaCu3Ti4.7O12 (CCT4.7O) powder was prepared by polymer pyrolysis method. The influence of phase composition and microstructure were characterized using X ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the TiO2 secondary phase has a remarkable on the microstructure, dielectric loss tangent (tan?? and dielectric constant (??) of CCT4.7O ceramics, respectively. Interestingly, low loss tangent of ~0.03 and giant dielectric constant of 31,908 with temperature coefficients less than ±15% in the temperature range of ?50–90 oC are observed in a ceramic sintered at 1060 oC for 10h (CCT4.7O-2). Both of ceramics sintered at 1060 oC for 6h (CCT4.7O-1) and 10 h (CCT4.7O-2) display a non linear current voltage with the non-linear coefficient (?) and breakdown field (Eb) values of 6.4, 5.6 and 1554, 1020, respectively. The dielectric constant, electrical response of grain boundaries, and related nonlinear current?voltage behavior are found to be associated with the microstructure of CCT4.7O ceramics.
机译：在这项工作中，通过聚合物热解法制备了CaCu3Ti4.7O12（CCT4.7O）粉末。使用X射线衍射（XRD）和扫描电子显微镜（SEM）表征了相组成和微观结构的影响。结果表明，TiO2二次相在CCT4.7O陶瓷的微观结构，介电损耗角正切（tanδ）和介电常数（Δε）方面均具有显着的特性，有趣的是，其损耗角正切值为〜0.03，介电常数为0.25％。在1060 oC烧结10h（CCT4.7O-2）的陶瓷中观察到31,908个温度系数在±50–90 oC范围内的温度系数小于±​​15％;两种陶瓷在1060 oC烧结6h（CCT4）。 7O-1）和10 h（CCT4.7O-2）显示的非线性电流电压的非线性系数（η）和击穿场（Eb）值分别为6.4、5.6和1554、1020。 ，晶界的电响应以及相关的非线性电流-电压行为均与CCT4.7O陶瓷的微观结构有关。

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