Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0167-2738(00)00671-8
Title: Effect of high-energy mechanical activation on the microstructure and electrical properties of ZnO-based varistors
Authors: Phui Fah, C.
Wang, J. 
Issue Date: 1-Jul-2000
Citation: Phui Fah, C., Wang, J. (2000-07-01). Effect of high-energy mechanical activation on the microstructure and electrical properties of ZnO-based varistors. Solid State Ionics 132 (1) : 107-117. ScholarBank@NUS Repository. https://doi.org/10.1016/S0167-2738(00)00671-8
Abstract: Zinc oxide-based varistors were prepared by subjecting the mixed oxide powders to high-energy mechanical activation for 5 h and 10 h, respectively. The crystallite sizes of the constituent oxides were refined to 10 approximately 15 nm by 5 h of high-energy mechanical activation. Similarly, the average particle size was refined from 0.45 μm to about 0.18 μm. The material derived from high-energy mechanical activation exhibit a higher density (>98% relative density) and more refined microstructure upon sintering at 1100 °C than those of the material derived from the powder subjected to no high-energy mechanical activation. They demonstrate much higher α-values than those of the materials sintered from the oxide powder without high-energy mechanical activation. These enhanced electric properties are due to great structural homogeneity and refined grain size brought about by high-energy mechanical activation.
Source Title: Solid State Ionics
URI: http://scholarbank.nus.edu.sg/handle/10635/107012
ISSN: 01672738
DOI: 10.1016/S0167-2738(00)00671-8
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