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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Grain size effect on the dielectric and non-ohmic properties of CaCu3Ti4O12 ceramics prepared by the sol-gel process
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Grain size effect on the dielectric and non-ohmic properties of CaCu3Ti4O12 ceramics prepared by the sol-gel process

机译：晶粒尺寸对溶胶 - 凝胶制备的CaCu3Ti4O12陶瓷介质和非欧姆特性的影响

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摘要

Grain size control is very important for enhancing the electric properties of CaCu3Ti4O12 (CCTO) ceramics. The effect of grain sizes on the dielectric and non-ohmic properties of the CCTO ceramics was investigated. Firstly, CCTO precursor powders were synthesized by the sol-gel process. Then the CCTO ceramics with different grain sizes were obtained under the same condition by using the powders calcined at different temperature. The XRD patterns of the sintered CCTO ceramics show the cubic perovskite with pure CCTO phases. The SEM results indicate that the mean grain sizes range of the CCTO ceramics are about 2.03(+/- 0.66) similar to 9.02(+/- 3.57) mu m. The electrical properties of the CCTO ceramics demonstrate that the change of the grain size obviously affects the non-ohmic characteristics and dielectric properties. And the larger grain size is beneficial to enhance the dielectric constant (epsilon approximate to 3 x 10(4), at a frequency of 1k Hz), while the smaller grain size is beneficial to improve its breakdown field (E-b approximate to 6010 V/cm) and nonlinear coefficient (alpha approximate to 24), which can be explained by the barrier behavior of Schottky-type model and the grain boundary properties of the internal barrier layer capacitor (IBLC) model. This work may provide an effective way to design high dielectric constant and nonlinear coefficient CCTO materials from the viewpoint of controlling grain size through the preparation parameter of the powders. (C) 2018 Elsevier B.V. All rights reserved.
机译：粒度控制对于增强CaCu3Ti4O12（CCTO）陶瓷的电性能非常重要。研究了晶粒尺寸对CCTO陶瓷的电介质和非欧姆特性的影响。首先，通过溶胶 - 凝胶法合成CCTO前体粉末。然后通过使用在不同温度下煅烧的粉末在相同的条件下获得具有不同晶粒尺寸的CCTO陶瓷。烧结的CCTO陶瓷的XRD模式显示了具有纯CCTO阶段的立方钙钛矿。 SEM结果表明，基准陶瓷的平均晶粒尺寸范围约为2.03（+/- 0.66），类似于9.02（+/- 3.57）mu m。 CCTO陶瓷的电特性表明，晶粒尺寸的变化显然影响了非欧姆特征和介电性能。并且较大的晶粒尺寸有利于增强介电常数（ε近似于3×10（4）），而较小的晶粒尺寸有利于改善其分解场（EB近似到6010 V /厘米），非线性系数（阿尔法近似〜24），其可以通过肖特基型模型的行为障碍和晶内部阻挡层电容器（IBLC）模型的边界特性来解释。从通过粉末的制备参数控制晶粒尺寸的观点来看，这项工作可以提供设计高介电常数和非线性系数CCTO材料的有效方法。 （c）2018年elestvier b.v.保留所有权利。

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