Effect of Simultaneous Addition of Zr and Y on Electrical Characteristics of ZnO Varistors

Abstract:

The effect of simultaneously adding Zr and Y to Bi–Mn–Co–Sb–Si–Cr–Ni-added ZnO varistors (having the same composition as a commercial varistor) on the varistor voltage, leakage current, and resistance to electrical degradation were investigated. Varistor voltage increased with increasing amount of Y for addition of 0–2 mol % Zr. On the other hand, the nonlinear coefficient α prior to electrical degradation changed very little on the addition of both Y and Zr. With the addition of approximately 1 mol% Zr, the leakage current decreased with increasing amount of Y added. A ZnO varistor with a varistor voltage of approximately 600 V/m, a low leakage current, and excellent resistance to electrical degradation was fabricated by adding approximately 2 mol% Y and approximately 1 mol% Zr.

• Periodical: Key Engineering Materials (Volume 485)
• Pages: 257-260
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.485.257
• Online since: July 2011
• Authors: Takayuki Watanabe, Ai Fukumori, Yuji Akiyamna, Yuuki Sato, Shinzo Yoshikado
• Keywords: Leakage Current, Resistance to Electrical Degradation, Varistor Voltage, Y Addition, ZnO Varistor, Zr Addition

References

[1] K. Eda, A. Iga, and M. Matsuoka: J. Appl. Phys. Vol. 51(5) (1980), p.2678.

[2] C. -H. Kim and J. -H. Kim: J. Ceram. Soc. Vol. 24 (2004), p.2537.

[3] M. Takada and S. Yoshikado: J. Euro. Ceram. Soc. Vol. 30 (2009), p.531.

[4] T. Takemura, M. Kobayashi, Y. Takada, and K. Sato: J. Am. Ceram. Soc. Vol. 70 (1987), p.237.

[5] S. Bernik, S. Mac, and B. Ai: J. Euro. Ceram. Soc Vol. 21 (2001), p.1875.

[6] Y. Akiyama, M. Takada, A. Fukumori, Y. Sato, and S. Yoshikado: Key Eng. Mater. Vol. 421–422 (2010), p.209.

[7] Y. Akiyama, A. Fukumori, M. Takada, Y. Sato, and S. Yoshikado: Key Eng. Mater. Vol. 445 (2010), p.237.