材料科学
煅烧
变阻器
烧结
陶瓷
电介质
钙钛矿(结构)
微观结构
电阻率和电导率
复合材料
分析化学(期刊)
化学工程
电压
化学
电气工程
光电子学
工程类
生物化学
催化作用
色谱法
作者
Jianying Li,Tong-wen Xu,Shengtao Li,Hai-yun Jin,Wen Li
标识
DOI:10.1016/j.jallcom.2010.06.155
摘要
Abstract In this work, CaCu3Ti4O12 (CCTO) ceramics based perovskite varistors were prepared using the solid-state reaction method, and effects of heat treatments at the high vacuum on their microstructures and electrical properties were investigated experimentally. Two conditions of heat treatment, i.e., calcining at 950 °C for 10 h and then sintering at 1100 °C for 20 h, and at 900 °C for 2 h in 10−4 Pa vacuum level were used. It was found from the X-ray diffraction (XRD) that for the former condition, the single phase of CCTO based on the perovskite structure was formed, whereas for the later condition, multiple phases were detected due to the decomposing of CCTO. The electrical response of both conditions was monitored using the dielectric spectroscopy and was revealed that varistor voltage increased remarkably due to the heat treatments at the high vacuum.
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