Additives distribution and electrical properties in zinc oxide varistor prepared by a wet chemical method

被引:3
|
作者
Takehana, M
Nishino, T
Sugawara, K
Sugawara, T
机构
[1] Electronic Device Division, TDK Corp., Akita Prefecture 018-04
[2] Div. of Mat. Process Engineering, Mining College, Akita University, Akita City, Akita Prefecture 010
关键词
zinc oxide; varistor; wet chemical method; electrical property; additives;
D O I
10.1007/BF02706006
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Cobalt-, praseodymium-added zinc oxide varistor was prepared through a wet chemical method followed by sintering with or without calcination. Changes in grain size, compact density, additives distribution, and voltage-current/capacitance-voltage relations were investigated for the characterization of the samples sintered at temperatures from 1473 to 1573 K without calcination or with calcination al 773 K for 2 h. The electrical properties were compared with those of samples prepared by two types of ball mill methods. The wet chemical method provided almost the same additives-distribution profile and less impurities in comparison with the ball grinding method carried out for 10-100 h. The donor concentration and the potential-barrier height for the samples were evaluated by Double Schottky Barrier Model. Addition of small amount of both cobalt and praseodymium in preparation by the wet chemical method was effective for a better nonlinearity relation between voltage and current, which has potential for a smaller sized varistor.
引用
收藏
页码:538 / 543
页数:6
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