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PTCR characteristics of semiconducting barium titanate ceramics produced by high-energy ball-milling

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Abstract

We studied the influence of potato-starch content and ball-milling time on the positive temperature coefficient of resistance (PTCR) characteristics of porous and semiconducting barium titanate ceramics, which were produced by high-energy ball-milling followed by solid state reaction. The sintered samples at room temperature crystallized in the tetragonal structure, irrespective of the potato-starch content and ball-milling time. As the ball-milling time increased, the porosity and pore size of the samples decreased, while and the grain size increased. Higher potato-starch content yielded a smaller grain size and higher porosity. The potato-starch additive and ball-milling time had little influence on the donor concentration of the grains. A larger PTCR jump was obtained with the addition of potato-starch mainly as a consequence of an increase in the porosity. A higher ball-milling time yielded both lower electrical resistivity and a lower PTCR jump.

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Authors and Affiliations

  1. Department of Advanced Materials Engineering, Sejong University, Seoul, 143-747, South Korea

    K. Park

  2. Department of Electronic Materials Engineering, Kwangwoon University, Seoul, 139-701, South Korea

    J.-G. Ha

  3. Research Institute of Industrial Science & Technology (RIST), Pohang, 790-330, South Korea

    C.-W. Kim

  4. Inorganic Chemistry Examination Team, Korean Intellectual Property Office, Daejeon, 302-701, Korea

    Jun-Gyu Kim

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  1. K. Park
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  2. J.-G. Ha
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  3. C.-W. Kim
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Correspondence to Jun-Gyu Kim.

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Park, K., Ha, JG., Kim, CW. et al. PTCR characteristics of semiconducting barium titanate ceramics produced by high-energy ball-milling. J Mater Sci: Mater Electron 19, 357–362 (2008). https://doi.org/10.1007/s10854-007-9343-0

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