Additives distribution and electrical properties in zinc oxide varistor prepared by a wet chemical method |
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Authors: | Makikazu Takehana Tomomichi Nishino Katsuyasu Sugawara Takuo Sugawara |
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Affiliation: | (1) Electronic Device Division, TDK Corp., 200 Hirasawa aza tachisawa Nikaho-machi Yuri-gun, 018-04 Akita Prefecture, Japan;(2) Division of Materials Process Engineering, Mining College, Akita University, 1-1 Tegata Gakuen-machi, 010 Akita City, Akita Prefecture, Japan |
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Abstract: | 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 voltagecurrent/ capacitance-voltage relations
were investigated for the characterization of the samples sintered at temperatures from 1473 to 1573 K without calcination
or with calcination at 773 K for 2 h. The electrical properties were compared with nhose 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. |
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Keywords: | Zinc Oxide Varistor Wet Chemical Method Electrical Property Additives |
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