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FLUORIDE-ION CONDUCTION AND ITS MECHANISM IN FLUORIDE GLASSES

Research Project

Project/Area Number 60550553
Research Category

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

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionKOBE UNIVERSITY

Principal Investigator

KAWAMOTO YOJI  KOBE UNIVERSITY, FACULTY OF SCIENCE, ASSOCIATE PROFESSOR, 理学部, 助教授 (00030776)

Co-Investigator(Kenkyū-buntansha) SOTANI NORIYUKI  KOBE UNIVERSITY, COLLEGE OF LIBERAL ARTS, PROFESSOR, 教養部, 教授 (90031335)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1986: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1985: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsFlouride Glass / Flouride-ion Conduction / 輸率
Research Abstract

1. Electrical conductivity measurements by ac methods were made of Al <F_3> -, Hf <F_4> -, Sc <F_3> -, Zn <F_2> -, Zr <F_4> -, Ga <F_3> -, Fe <F_3> - and In <F_3> -based fluoride glasses. The conductivities of the examined glasses ranged from about <10^(-6)> to about 10- <^2S> ・ <cm^(-1)> at 200゜C. The magnitude of conductivity, though it varies to some extent with glass composition, increased in the order described above. As the result a fluoride glass with a conductivity superior to that <beta> -Pb <F_2> was found in the In <F_3> -based glass system.
2. The transport numbers of <F^-> ions were examined of Zr <F_4> -Ba <F_2> -CsF and Fe <F_3> -Mn <F_2> -Pb <F_2> glasses with relatively high electrical conductivities by the Tubandt and emf methods, respectively. The result revealed that the former glasses are purely <F^-> -ion conductors, while the latter glasses are mixed <F^-> -ion and electron conductors.
3. Electrical conductivity and <^(19)F> -CW・NMR measurements were made of a BaZr … More <F_6> glass and <alpha> - and <beta> -BaZr <F_6> crystals. The NMR result elucidated that, in the glass and the crystals, there are two kinds of <F^-> -ion sites with different behaviors of motion. The electrical conductivity and NMR results clarified that the easiness of <F^-> -ion movement are in the order BaZr <F_6> glass, <beta> -BaZr <F_6> , <alpha> -BaZr <F_6> , indicating that a glassy state is favorable for <F^-> -ion conduction, compared with a crystalline state.
4. Based on the compositional dependence of electrical conductivity of various fluoride glasses and Zr <F_4> -Ba <F_2> -CsF glasses, the followings were deduced on the <F^-> -ion conduction-determining factors: The conductivity of <F^-> ions in fluoride glasses are predominantly determined by the activation energies for conduction. The activation energy for conduction decreases with an increase in the average polarizability of glass-constituting cations and with a decrease in the single bond strengths between glass-forming cations and <F^-> ions. Less

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Yoji Kawamoto: Solid state Ionics. 22. 207-212 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoji Kawamoto: Solid State Ionics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoji Kawamoto: J.Non-Crystalline Solids.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 河本洋二: 日本化学会誌. 1783-1789 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y.Kawamoto: Materials Science Forum. 6. 767-774 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoji Kawamoto: "Ionic Conduction of Zr <F_4> -Ba <F_2> -CsF Glasses" Solid State Ionics. 22. 207-212 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoji Kawamoto: "Exploration of Fluoride Glasses with Faster Fluoride-ion Conduction" Solid State Ionics.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoji Kawamoto: "Chemical State of Iron and Electrical Conduction in Fe <F_3> -Pb <F_2> -Mn <F_2> Glasses" J. Non-Crystalline Solids. To be published.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoji Kawamoto: "Ionic Conductivity of Zr <F_4> -Ba <F_2> -M <F_n> Fluoride Glasses (M: The Group I-V Metal Elements)" Nippon Kagaku Kaishi. 1783-1789 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoji Kawamoto: "Ionic Conductivity of Zr <F_4> -Ba <F_2> -CsF Glasses" Materials Science Forum. 6. 767-774 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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

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