PTCR Properties of Composites Consisted of Metals with Low Melting Point and Conductive Ceramics

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  • KINTAKA Yuji
    Graduate Division, Tohoku University Youkaichi Plant, Murata Mfg. Co., Ltd.
  • TANAKA Terumi
    Department of Materials Science, Faculty of Engineering, Tohoku University
  • TAKAMURA Hitoshi
    Department of Materials Science, Faculty of Engineering, Tohoku University
  • HOMMA Motofumi
    Department of Materials Science, Faculty of Engineering, Tohoku University
  • OKADA Masuo
    Department of Materials Science, Faculty of Engineering, Tohoku University

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  • 低融点金属-導電性セラミックス複合体のPTCR特性
  • テイ ユウテン キンゾク ドウデンセイ セラミックス フクゴウタイ ノ PTC

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Many metals show the steep increase of their specific resistivity on melting. This phenomenon was applied for producing new PTCR materials in the Pb-TiO2 and Sn-TiO2 systems. The xPb-(100-x)Ti0.99Nb0.01O2 samples with x>15 showed the steep increase of resistivity (PTCR properties) around 327°C, and it was noted that the temperature coefficient of resistivity below the PTCR temperature changes from negative to positive with increasing Pb content. The xSn-(100-x)Ti0.99Nb0.01O2 samples showed PTCR properties around the melting point of Sn (232°C), but PTCR properties are less significant than those observed in the Pb-TiO2 system.

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