The effect of Ti/Sr ratio on grain growth of La-doped SrTiO3 ceramics

被引：7

作者：

Furukawa, Y

Sakurai, O

Funakubo, H

Shinozaki, K

Mizutani, N

机构：

[1] Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152, 2-12-1, O-okayama

来源：

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 1996年 / 104卷 / 03期

关键词：

SrTiO3; Ti/Sr ratio; grain growth; liquid phase sintering; nucleation;

D O I：

10.2109/jcersj.104.190

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：

The effect of Ti/Sr ratio on the grain growth of La-doped SrTiO3 ceramics sintered at 1400-1490 degrees C for 2h in 5%H-2-95%N-2 with precisely controlled Ti/Sr ratio of 0.96-1.04 was investigated. The grain size was maximum at Ti/Sr ratio of 1.000 and remarkably decreased with excess amounts of Sr and Ti above 1470 degrees C. However, the grain size was 2 mu m and almost constant below 1440 degrees C regardless of the composition. The bulk density was almost constant (97%) in the Ti excess region, but decreased remarkably by addition of excess Sr. The microstructure was divided into three types depending on the Ti/Sr ratio and sintering temperature; (1) Sr rich region, (2) Ti/Sr greater than or equal to 1 and above 1470 degrees C, (3) Ti/Sr greater than or equal to 1 and below 1440 degrees C. Tn the early stage, the nuclei of remarkably grown grains were formed and their amount and the grain growth rate were dependent on the Ti/Sr ratios.

引用

页码：190 / 195

页数：6