Dependence of grain growth and grain-boundary structure on the Ba/Ti ratio in BaTiO3

被引:61
作者
Cho, YK [1 ]
Kang, SJL [1 ]
Yoon, DY [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea
关键词
D O I
10.1111/j.1551-2916.2004.00119.x
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 grain-growth behavior and grain-boundary structure in titanium-excess BaTiO3 depend on the amount of excess titanium at 1250degrees and 1300degreesC. With excess titanium, abnormal grain growth (AGG) occurs and the grain boundaries are mostly flat or faceted with hill-and-valley shapes. With 0.5 at.% excess titanium, the large grains have flat {111} faces forming singular grain boundaries parallel to {111} double twins. With excess-titanium content between 0.1 and 0.3 at.%, the abnormal grains appear to have polyhedral shapes with {100} faces. These flat or faceted grain boundaries are expected to have singular structures, and hence AGG can occur by the step growth mechanism. When the excess-titanium content is decreased to 0, the grain boundaries become curved, indicating a rough atomic structure, and normal grain growth occurs.
引用
收藏
页码:119 / 124
页数:6
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