Microstructure and dielectrical properties of CaCu3Ti4O12/TiO2 composite ceramics with core-shell structure

作者：Hao, Wentao^*; Xu, Panpan; Wang, Mingwen; Yang, Shuai; Yupeng, Wang; Wu, Hui; Sun, Li^*; Cao, Ensi; Zhang, Yongjia

来源：Journal of Alloys and Compounds, 2018, 740: 1159-1164.

DOI：10.1016/j.jallcom.2018.01.080

• CaCu3Ti4O12 ceramics
• Dielectric loss
• IBLC
• Insulating barrier layer
• TiO2

The large low-frequency dielectric loss of CaCu3Ti4O12 (CCTO) ceramics limit their applications. According to the internal barrier layer capacitance effect, which is the most widely accepted explanation for the giant-epsilon' phenomenon of CCTO ceramics, increasing the resistance of grain boundary is an effective way to reduce their low-frequency dielectric loss. In this work, CCTO/TiO2 composite ceramics with coreshell structure were prepared by sol-gel-like method, and their crystalline structures, microstructures, dielectrical properties and complex impedance were investigated systematically. The results show that the room temperature low-frequency dielectric loss of our CCTO-based ceramics decreased significantly by TiO2-doping and annealing in oxygen, which should be attributed to the increasing resistance of the insulating grain boundary.

• 出版日期2018-4-5
• 单位太原理工大学