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

Korean Journal of Chemical Engineering volume 13, pages538–543(1996)Cite this article

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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Affiliations

  1. Electronic Device Division, TDK Corp., 200 Hirasawa aza tachisawa Nikaho-machi Yuri-gun, 018-04, Akita Prefecture, Japan

    Makikazu Takehana, Tomomichi Nishino, Katsuyasu Sugawara & Takuo Sugawara

  2. Division of Materials Process Engineering, Mining College, Akita University, 1-1 Tegata Gakuen-machi, 010, Akita City, Akita Prefecture, Japan

    Tomomichi Nishino, Katsuyasu Sugawara & Takuo Sugawara

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  1. Makikazu Takehana
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  2. Tomomichi Nishino
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  3. Katsuyasu Sugawara
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  4. Takuo Sugawara
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Correspondence to Makikazu Takehana.

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Takehana, M., Nishino, T., Sugawara, K. et al. Additives distribution and electrical properties in zinc oxide varistor prepared by a wet chemical method. Korean J. Chem. Eng. 13, 538–543 (1996). https://doi.org/10.1007/BF02706006

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Key words

  • Zinc Oxide
  • Varistor
  • Wet Chemical Method
  • Electrical Property
  • Additives