Influence of sintering atmosphere on dielectric properties and microstructure of CaCu3Ti4O12 ceramics
Influence of sintering atmosphere on dielectric properties and microstructure of CaCu3Ti4O12 ceramics
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烧结气氛对CaCu3Ti4O12陶瓷介电性能和微观结构的影响
DOI：
10.1016/j.ceramint.2012.10.127
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发表时间：
2013-05
影响因子：
5.2
通讯作者：
Xu, Ning
中科院分区：
文献类型：
--
作者：
Wang, Bo;Pu, Yong-Ping;Wu, Hai-Dong;Chen, Kai;Xu, Ning
采用固相反应法，在不同体积比的O2和N2混合气流中烧结CaCu 3 Ti4 O 12（CCTO）陶瓷，烧结过程中通过气体配比器严格控制体积比。研究了不同体积分数O2（x）对CCTO陶瓷显微结构和介电性能的影响。当x≥ 20%时，XRD图谱中出现了Cu 4 O3相，表明Cu 2 O与O2发生了化学反应。CCTO生成的吉布斯自由能与CaO-CuO/Cu_2 O-TiO_2体系的三元相关系密切相关，x的降低促进了CCTO的分解。所有样品在20 ~ 100 kHz的宽频率范围内均表现出较高的介电常数（≥5×103），且随x的增大而逐渐减小。电导率的Cole-Cole曲线表明，晶粒和晶界的电阻率都随着x的增加而增加。随着x的增加，晶界电导率发生变化.
CaCu3Ti4O12(CCTO) ceramics were sintered in the mixed gases flow of O2and N2with different volume ratios by the solid state reaction method, the volume ratios were strictly controlled by a gas mixture proportioner during sintering. The effects of different volume fractions of O2(x) on the microstructure and dielectric properties of CCTO ceramics were investigated. The appearance of Cu4O3phase in the XRD patterns when x≥20%, suggests that a chemical reaction had occurred between Cu2O and O2. The Gibbs energy of formation of CCTO was closely related to the ternary phase relations of system CaO–CuO/Cu2O–TiO2, and the decrease of x promoted the decomposition of CCTO. All the samples showed high dielectric constant (≥5×103) in a broad frequency range from 20Hz to 100kHz, which decreased gradually with increasing x. Cole–Cole plots of conductivity suggested that the resistivity of grain and grain boundary both increased with increasing x. With the variation in the conductivity of grain boundary which is caused by the increasing x.
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影响因子：
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作者：
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通讯作者：
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