| 非化学配比对BaTiO_3缺陷及晶粒大小的影响 |
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| 引用本文： | 唐超群,姚淑德.非化学配比对BaTiO_3缺陷及晶粒大小的影响[J].华中科技大学学报(自然科学版),1997(6). |
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| 作者姓名： | 唐超群 姚淑德 |
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| 作者单位： | 北京大学(唐超群)，华中理工大学物理系(姚淑德) |
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| 摘 要： | 对原子分数为０．２５％的Ｌａ掺杂的具有不同Ｂａ和Ｔｉ原子数配比Ｒ的ＢａＴｉＯ３材料，通过正电子寿命测量和电镜观测，研究了Ｒ对材料缺陷及晶粒大小的影响．结果表明：Ｂａ过量明显地使材料中的Ｔｉ空位增多而使晶粒变小，Ｔｉ过量使材料中Ｂａ空位增多，同时使晶粒变大，但影响轻微．
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| 关 键 词： | BaTiO_3 缺陷 晶粒大小 |
The Influence of Non Stoichiometry on the Defects and Grain Size of BaTiO 3 |
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| Tang
Chaoqun Assoc. Prof., Dept. of Physics,HUST,Wuhan ,China.
Yao Shude.The Influence of Non Stoichiometry on the Defects and Grain Size of BaTiO 3[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,1997(6). |
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| Authors: | Tang
Chaoqun Assoc Prof Dept of Physics HUST Wuhan China
Yao Shude |
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| Institution: | Tang
Chaoqun Assoc. Prof., Dept. of Physics,HUST,Wuhan 430074,China.
Yao Shude |
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| Abstract: | The measurement of positron lifetime and observation by scanning
electron microscopy (SEM) have been carried out for BaTiO 3 ceramics with different ratios R
of Ba atomicity to Ti atomicity. Experimental results show that both the defect behavior and
grain size of BaTiO 3 ceramics are influenced by non stoichiometery, i.e., by different R . In
Ti rich samples, with an increase of 1/ R , both the Ba vacancy concentration and the grain
size gradually increase. In Ba rich samples, as the R increases, the Ti vacancy
concentration increases rapidly, but the grain size decreases significantly. |
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| Keywords: | BaTiO 3 defect grain size |
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