Effect of Bismuth of Oxide Content on the Sintering of Zinc Oxide |
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Authors: | Jinho Kim Toshio Kimura Takashi Yamaguchi |
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Affiliation: | Faculty of Science and Technology, Keio University, 3–14–1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan |
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Abstract: | Densification and microstructure de velopment in Bi2O3-doped ZnO have been studied with a special emphasis on the effect of the Bi2O3 content. A small amount of Bi2O3 in ZnO ( 0.1 mol%) retarded densification, but the addition of Bi2O3 to more than 0.5 mol% promoted densification by the formation of a liquid phase above the eutectic temperature (~740°C). The liquid phase increased grain-boundary mobility, which was responsible for the formation of intragrain pores and the decrease in the sintered density. The increase in the Bi2O3 content increased the probability of the formation of skeleton structure, which reduced the grain growth rate and the sintered density. |
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Keywords: | zinc oxide varistors sintering microstructure bismuth oxide |
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