Preparation of porous (Ba,Sr)TiO3 by adding corn-starch |
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| Authors: | J-G Kim J-H SimW-S Cho |
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| Institution: | a Institute of Advanced Materials, Inha University, 253 Yonghyun-dong, Nam-ku, Inchon 402-751, South Korea
b School of Materials Science and Engineering, Inha University, 253 Yonghyun-dong, Nam-ku, Inchon 402-751, South Korea |
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| Abstract: | A new method of preparing porous (Ba,Sr)TiO3 ceramics has been introduced, using an ordinary ceramics processing technique. The effect of corn-starch on the positive temperature coefficient of resistivity characteristics and microstructure of the porous (Ba,Sr)TiO3 ceramics has been investigated. When the corn-starch addition was 1-20 wt%, the PTCR jump was over 106 and 1-2 orders higher than that of samples without corn-starch. Also, it was found that the (Ba,Sr)TiO3 ceramics had porous microstructure by the addition of corn-starch. The porosity of the ceramics with 20 wt% corn-starch was 44%. The electrical properties of the (Ba,Sr)TiO3 ceramics have been discussed, based on the microstructure, resistivity of grain boundaries, donor concentration of grains and the electrical potential barrier of grain boundaries. |
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| Keywords: | A Ceramics D Electrical properties |
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