Effect of sintering temperature on the electrical property and microstructure of Zn_0.9Bi_0.02Mn_0.02Cr_0.02Al_0.04O varistor

Authors

Rowel V. Tabajonda ⋅ PH Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños and Materials Science and Engineering Program, University of the Philippines Diliman
Katrina B. Oliva ⋅ PH Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños and Materials Science and Engineering Program, University of the Philippines Diliman
Roland V. Sarmago ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

The effect of different sintering temperatures ranging from 800°C to 1100°C on the electrical and microstructure of Zn_0.9Bi_0.02Mn_0.02Cr_0.02Al_0.04O varistor was investigated. From the results, the grain size of the varistor increased from 38.8 μm to 185.2 μm for increasing temperature. On the other hand, the amounts of dopants in the varistor remained constant after sintering except for aluminum. In relation to the nonlinearity coefficient, α, varistors sintered up to 1025°C has an increasing nonlinearity coefficient. The highest value of α is 6.600, which is obtained from the varistor sintered at 1025°C. Beyond that, the value α decreased. Results showed that sintering temperature affects the grain size, amount of dopants and the nonlinearity coefficient. The value of nonlinearity coefficient and grain size increases for increasing sintering temperature. However at higher temperature the value of α decreases because of the loss of other dopants that evaporates at higher temperature.

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Issue

2006: Proceedings of the 24th Samahang Pisika ng Pilipinas National Physics Congress

Article ID

SPP-2006-2D-01

Section

Materials Science

Published

2006-10-25

How to Cite

[1]

RV Tabajonda, KB Oliva, and RV Sarmago, Effect of sintering temperature on the electrical property and microstructure of Zn0.9Bi0.02Mn0.02Cr0.02Al0.04O varistor, Proceedings of the Samahang Pisika ng Pilipinas 24, SPP-2006-2D-01 (2006). URL: https://proceedings.spp-online.org/article/view/SPP-2006-2D-01.