The study of Ca-doped BCTZ ceramics sintered in reducing atmosphere

被引：9

作者：

Chen, Lei ^{[1
]}

Li, Longtu ^{[1
]}

Wang, Xiaohui ^{[1
]}

Tian, Zhibin ^{[1
]}

Gui, Zhilun ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

来源：

JOURNAL OF ELECTROCERAMICS | 2008年 / 21卷 / 1-4期

关键词：

BCTZ; MLCC; Calcium; Insulation resistance;

D O I：

10.1007/s10832-007-9245-9

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：

Effects of Ca2+ doped into (Ba1-xCax)(Ti1-yZry)O-3 (BCTZ) ceramics on microstructure and insulation resistance have been investigated. It is found that the shift of Ca2+ from A-sites to B-sites greatly influences the unit cell volume and the Curie temperature of BCTZ ceramics. During the firing process in reducing atmosphere, the large amounts of additive Ca2+ dispense among the grain boundaries and lead to the restrain of the grain growth. Within the same volume, the specimen with smaller grain size provides more grain boundaries, which helps in providing an efficient diffusion pathway for oxygen during annealing step and results in the improvement of the insulation resistance of the samples.

引用

页码：569 / 572

页数：4

共 13 条

[1] Dielectric properties of acceptor-doped (Ba,Ca)(Ti,Zr)O3 ceramics [J].