Texture development and dielectric relaxor behavior of 0.80Na0.5Bi0.5TiO3-0.20K0.5Bi0.5TiO3 ceramics templated by plate-like NaNbO3 particles

被引:20
作者
Gao Feng [1 ]
Liu Liangliang [1 ]
Xu Bei [1 ]
Hu GuoXin [1 ]
Cao Xiao [1 ]
Hong Rongzi [1 ]
Tian Changsheng [1 ]
机构
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Coll Mat Sci & Engn, Xian 710072, Peoples R China
关键词
Perovskites; Tape casting; Grain growth; Texture; Dielectric relaxor; GRAIN-GROWTH; MICROSTRUCTURE DEVELOPMENT; FORMULATION; TRANSITION;
D O I
10.1016/j.jeurceramsoc.2011.07.018
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Plate-like NaNbO3 particles were used as templates to fabricate grain-oriented 0.96(0.8Na(0.5)Bi(0.5)TiO(3)-0.2K(0.5)Bi(0.5)TiO(3))-0.04NaNbO(3) (NKBT) ceramics. The effects of the sintering temperature and the soaking time on the grain orientation and the microstructure of the textured NKBT ceramics were investigated, and the dielectric relaxor behavior is discussed. The results show that textured ceramics were successfully obtained with orientation factor more than 0.8. The textured ceramics have a microstructure with strip-like grains aligning in the direction parallel to the casting plane. The degree of grain orientation increases initially, then decreases with increasing sintering temperature, and increases continuously with increasing soaking time. The textured NKBT ceramics shows obvious dielectric relaxor characteristics which can be well explained by microdomain-macrodomain transition theory with calculating criterion K. The results show that formation of texture is beneficial to microdomain-macrodomain transition, which lead to weaken relaxor behavior and raise the dielectric constant at T-tr. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2987 / 2996
页数:10
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