Effects of Zr and Y Addition on the Electrical Degradation Characteristics of ZnO Varistors

Abstract:

Article Preview

The effects of the addition of Y or both Y and Zr to Bi-Mn-Co-Sb-Si-Cr-Ni-added ZnO varistors on the varistor voltage and the tolerance characteristics of electrical degradation were investigated. The deterioration of the tolerance characteristics of electrical degradation by the addition of Y was probably caused by an increase in the number of willemite (Zn2SiO4)-type particles or a decrease in the number of spinel (Zn2.33Sb0.67O4)-type particles, but this deterioration was reduced by adding Zr. Moreover, the reduction in the average ZnO grain size due to the addition of Y was a major factor in the increased varistor voltage, and the ZnO grain growth was inhibited by the formation of an un-known compound after adding Y. The varistor voltage of a varistor with 2 mol% added Y increased by approximately 50% compared to a varistor with no Y added.

Info:

Periodical:

Edited by:

Shinobu Fujihara and Tadashi Takenaka

Pages:

237-240

DOI:

10.4028/www.scientific.net/KEM.445.237

Citation:

Y. Akiyama et al., "Effects of Zr and Y Addition on the Electrical Degradation Characteristics of ZnO Varistors", Key Engineering Materials, Vol. 445, pp. 237-240, 2010

Online since:

July 2010

Export:

Price:

$35.00

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

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

[3] M. Takada and S. Yoshikado: J. Euro. Ceram. Soc. 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 21 (2001), p.1875.

[6] Y. Akiyama, S. Yoshikado et al.: Key Eng. Mater. Vol. 421-422 (2010), p.209.

[7] T. Senda: J. Am. Ceram. Soc. 30 (2009), p.531 (a) (b) Fig. 6 Relation between values of V bef / V deg and RII of willemite-type and spinel-type particles for samples of (a) Type 1 and (b) Type 2.

In order to see related information, you need to Login.