Paper Title:
Effects of Zr and Y Addition on the Electrical Degradation Characteristics of ZnO Varistors
  Abstract

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, A. Fukumori, M. Takada, Y. Sato, S. Yoshikado, "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
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