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Direct measutement of grain boundary conductivity of ionic conductor thick films composed of onr grain perpendicular to the film surface

Research Project

Project/Area Number 61550582
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionMuzashi Institute Technology

Principal Investigator

MASAYUKI Nagai  Musashi Institute of Technology, Faculty of Engineering. Associatr Professor, 工学部, 助教授 (80112481)

Co-Investigator(Kenkyū-buntansha) KAZUNICHI Yoshino  the same as above, Lecturer, 工学部, 講師 (40061535)
TASASHI Sakurai  the same as above,@lecturer, 工学部, 講師 (70061538)
TASASHI Nishino  the same as above, professor, 工学部, 教授 (30061485)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1987: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1986: ¥1,700,000 (Direct Cost: ¥1,700,000)
Keywordsionic conductor / hydroxyapatice / thick film / doctor blade method / electrical conductivity / atmospheric dependence / 焼結膜 / 電気伝導 / 粒界伝導
Research Abstract

Among a large number of ionic conductors, polycrystalline thick films of hydroexyapatite were mainly incestigated to clatify the eddect of the grain boundary and surface on the electrical conductivity. The reason for adopting hydroxyapatite is that it exhibits ionic conduction at elevated temperatures and can easily prepared in fine powder form. High purity and extremely fine powders were prepared by a conventional wet process under vatious conditions. The resultant powders were mixed with an organic vehicle and tape casted by the doctor blade method followed by sintering after decomposition and evapotration of the organic behicle. The film thickness of the sample was about 200 m and was found too large to make the film composed of one grain perpendicular to the film surface because it consisted of grains with less that 1 m diameter. Therefore, firect measurement of grain boundary conductivity could not be cattied out. However, atmospheric dependence ot the conductivity was found rematkable for porous samples when they were measured in himidified air ot air containing CO2. The samples without any treatment showed weak dependence while thosw with soaking treatment showed strong dependence. The effect was most significant when the sapmles were soaked in a solution containing C1ions. In particular, the conductivity was markeyldy sensitive to a samll amount of CO2 and thought to possess potential as a CO2 gas sensor.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 永井正幸,西野忠: Solid State Ionics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 永井正幸,西野忠,佐伯達哉: Sensors and Actuators.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 永井正幸,西野忠,金澤孝之: J.of Mat.Sci,Lett.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 永井正幸,佐伯達哉,日比野雅之,西野忠: Solid State Ionics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masayuki Nagai and %tadashi Nishino: "Surface Condiction of Porous Hydroxyapatite Ceramics at Elevated Temperatures" Solid State Ionics.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masayuki Nagai, Tasashi Nishino and Tatsuya %saeki: "A New Type of CO_2 Gas Sensor Comprised of Porous Hydroxyapatite Ceramics" Sensors and Actuators.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masayuki Nagai, Tadashi Nishino and takafumi Kanazawa: "Sequential Phase Development of CaHPO_4. 2H_2O on Heating" Joutnal of Material Science Letters.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masayuki Nagai, Tatsuya Saeki, Masayuki Hibino and Tadashi Nishino: "Solid State Ionics" Stabilization of CO2 Sensor Characteristics by Means of Surface Treatment.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 桜井正,永井正幸,西野忠: 窯業協会誌. 94. 827-831 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 大和田仁,山下仁大,梅垣高士,金沢孝文,永井正幸: 窯業協会誌. 94. 837-841 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 永井正幸,西野忠,金沢孝文: Solid State Ionics. 18,19. 964-968 (1986)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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