Effect of excess BaO and Nb2O5 on the grain coarsening of Ba(Ni1/3Nb2/3)O3 ceramics

被引：1
|
作者：
Park, JK [1 ]
Kim, DY
Hwang, NM
机构：
[1] Seoul Natl Univ, Sch Mat Sci & Engn, Seoul 151742, South Korea
[2] Seoul Natl Univ, Ctr Microstruct Sci Mat, Seoul 151742, South Korea
[3] Korea Res Inst Stand & Sci, Taejon 305606, South Korea
来源：
SCRIPTA MATERIALIA | 2001年 / 44卷 / 02期
关键词：
sintering; Ba(Ni1/3Nb2/3)O-3; solid-liquid interface; grain coarsening; abnormal grain growth;
D O I：
10.1016/S1359-6462(00)00584-4
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The change of grain shape and resultant change in coarsening behavior of Ba(Ni1/3Nb2/3)O3 (BNN) ceramics which are widely used as microwave dielectrics were studied. During sintering at 1600 °C, the grains of the BNN specimen containing excess Nb2O5 were spherical and exhibited normal grain growth. With excess BaO, the grain shape was angular and abnormal grain growth was observed to occur. The normal and abnormal grain growth behavior can be explained in terms of diffusion controlled and 2-D nucleation controlled coarsening mechanism, respectively. An important point is that the grain shape is changed by a small compositional variation of the BNN specimen, and therefore the coarsening behavior is drastically changed.
引用
收藏
页码：195 / 199
页数：5
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