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Development of Bi alloy insulator composites exhibiting metal-insulator-transition-like resistivity change

Research Project

Project/Area Number 11555171
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Composite materials/Physical properties
Research InstitutionYamaguchi University

Principal Investigator

MIKI Toshikatsu  Yamaguchi University, Faculty of Engineering, Professor, 工学部, 教授 (70091212)

Co-Investigator(Kenkyū-buntansha) MURATA Takuya  Yamaguchi University, Faculty of Engineering, Research Associate, 工学部, 助手 (70263796)
笹岡 秀紀  ベンチャービジネスラボラトリー, 非常勤研究員
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥4,700,000 (Direct Cost: ¥4,700,000)
KeywordsPTCR / over-current limiter / Bi-insulator composite / Bi alloy / metal-network / PTCR element / PTCR材料 / 温度感応型電流制限素子 / 導電性ネットワーク / チューブラ型 / スパッタパタン型 / Biガラスコンポジット / 衝撃圧成型 / 電極一括形成技術 / 金属ネットワーク切断モデル / 抵抗ジャンプ温度の低温化 / コンポジット材料 / 抵抗温度特性 / マイクロ波プロセス
Research Abstract

In this project, we have investigated "metal-insulator transition like PTCR material : Bi-insulator composite" to develop a new type of thermo-sensitive over-current limiter. The composite utilizes self-fixing process in metal-networks composed of Bi micro-particles depending on temperature change. Two prototypes have been made not only for verifying the PTCR mechanism but also for fabricating the electrical element. Besides, effect of microwave heating was studied to improve the PTCR property of the usual ceramics material. Obtained results are summarized as follows.
1) The ρ_<RT>, resistivity at room temperature, of Bi-polyimide composite increases after one cycle of heating and cooling process. On the other hand, in Bi-glass composite the ρ_<RT> was kept stable at 〜 1 Ωcm even with repeated thermal stresses. The ρ_<HT>, resistivity at high temperature, of the Bi-glass composite was higher than 10^6 Ωcm.
2) We proposed the PTCR mechanism for the Bi-glass composite in terms of "Bi-metal micro-networks" based on the microstructure observations. The hysterisis characteristic in ρ - T relation was expressed by freezing process of Bi micro-particles.
3) The critical temperature of the resistivity change in Bi-Sn alloy-glass composite was 〜 100K lower than that of Bi-glass composite, which is close to that of a PTCR BaTiO_3. However, the ρ - T relation shows semiconductor characteristics and the ρ_<HT>/ρ_<RT> is lower than 1.
4) We have made two prototypes of Bi-glass with PTCR property. One is micro-tube filled with Bi, and another is micro-pattern designed by sputtered Bi on a glass plate. In both elements Bi micro- particles with micron or lower in size should be packed in glass matrix for obtaining PTCR property.
5) Although ρ_<RT> of BaTiO_3 ceramic was reduced by microwave heating, the PTCR property is inferior to that of Bi-glass composite.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] S.Jida, T.Suemasu, T.Miki: "Effect of microwave heating on BaTiO_3:Nb ceramics with positive temperature coefficient of resistivity"Journal of Applied Physics. 86・4. 2089-2094 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Murata, Y Hirokane, S.Jida, T.Miki: "Bismuth-Glass Composites with a Metal-Insulator-Transition-Like Resistivity Change at High Temperatures"Japanese Journal of Applied Physics. 41・3A. 1441-1445 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Uchida, T.Miki: "Effect of X-Irradiation on BaTiO_3:Ta Ceramics-Electrical Properties and ESR-"Applied Radiation and Isotopes. (掲載予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Jida, T. Suemasu, T. Miki: "Effect of microwave heating on BaTiO_3 : Nb ceramics with positive temperature coefficient of resistivity"Journal of Applied Physics. Vol.86 - No.4. 2089-2094 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Murata, Y. Hirokane, S. Jida, T. Miki: "Bismuth-Glass Composites with a Metal-Insulator-Transition-Like Resistivity Change at High Temperatures"Japanese Journal of Applied Physics. Vol.41 - No.3A. 1441-1445 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Uchida, T. Miki: "Effect of X-Irradiation on BaTiO_3 : Ta Ceramics - Electrical Properties and ESR -"Applied Radiation and Isotopes. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Jida, T.Suemasu, T.Miki: "Effect of microwave heating on BaTiO_3 : Nb ceramics with positive temperature coefficient of resistivity"Journal of Applied Physics. 86・4. 2089-2094 (1999)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Murata, Y.Hirokane, S.Jida, T.Miki: "Bismuth-Glass Composites with a Metal-Insulator-Transition-Like Resistivity Change at High Temperatures"Japanese Journal of Applied Physics. (掲載予定).

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Uchida, T.Miki: "Effect of X-Irradiation on BaTiO_3 : Ta Ceramics -Electrical Properties and ESR-"Applied Radiation and Isotopes. (掲載予定).

    • Related Report
      2001 Annual Research Report
  • [Publications] Ayako KAl,Toshikatsu Miki: "Hybrid Crystals of Calcium Carbonate and Amino Acids "Jpn.J.Appl.Phys.. 39. L1071-L1073 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Jida, S.Suemasu, T. Miki: "Effect of microwave heating on BaTiO3:Nb ceramicis with positive temperature coeffcient of resistivity"Journal of Applied Physics. 86・4. 2089-2094 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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