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Viscous flow mechanisms of fluoride glasses in wide temperature range.

Research Project

Project/Area Number 63470056
Research Category

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

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionNagaoka University of Technology

Principal Investigator

MATUSITA Kazumasa  Nagaoka University of Technology. Department of Chemistry, Professor., 工学部, 教授 (80024610)

Co-Investigator(Kenkyū-buntansha) KOMATSU Takayuki  Nagaoka University of Technology. Department of Chemistry, Associate Professor., 工学部, 助教授 (60143822)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1989: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1988: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsFluoride glasses / Viscosity / Glass transition / Penetration viscometer / Rotational viscometer / Infrared optics / Fiber drawing / Macedor-Litovitz equation / Macedo-粘度式 / ガラス転移温度 / Macedo-Litovitz粘度式 / ファイバー形成能
Research Abstract

Fluoride glasses have attracted much attention because of infrared optical properties. The chemical bonds in fluoride glasses are much ionic compared with those in oxide glasses. Therefore, it is expected that many properties are different between fluoride glasses and oxideglasses. In the present study, the viscosity of fluoride glasses was measured in the wide temperature range.
In the low temperature range, the viscosity in 10^6 - 10^<12> Pa・s was measured by the penetration method by using TMA (Thermomechnical Analyzer). In the limited range, the viscosity was found to be expressed by the Fulcher equation. The glass transition temperature. T_g, was determined by DSC and thermal expansion measurements as a function of the heating rate. The glass transition temperature at zero heating rate, T_<go>, was determined by exporatolation. It was found that the viscosity at T_<go> is always 10^<12>Pa・s irrespective of chemical composition of glass.
For the measurement of high temperature viscosity, the rotational viscometer was constructed in which the atmosphere can be controlled. The vicosity in 10^<-1> - 10^2 Pa・s can be measured by this viscometer. It was found that at high temperature, the viscositu is very low and does not change with temperature so much whereas in the low temperature, the viscosity is very high and changes extraordinarily with temperature. The viscosity in the range between glass transition and 1200゚C cannot be expressed by a simple Fulcher equation and can be expressed by the Macedo-Litovitz equation, log eta = A + B/T + C/(T-To), with the assumption of B=BoT^<-2>.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 松下和正,山本英樹,小松高行: "Non-Isothermal Crystallization in ZrF_4-BaF_2-GdF_3-AlF_4 Fluorode Glasses." Thermochimica Acta.I23. 263-270 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kazumasa Matusita,Hideki Yamamoto,Takayuki Komatsu: "Crystal Growth in ZrF_4-BaF_2 Based Fluoride Glasses." Materials Science Forum. 32&33. 185-190 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kazumasa Matusita,Hiroshi Kato,Takayuki Komatsu: "Photoelastic Effects in Some Fluoride Glasses Based on the ZrF_4-BaF_2 Systems." Journal of Non-Crystalline Solids.112. 341-346 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Manabu Koide,Kazumasa Matusita,Takayuki Komatsu: "Viscosity of Fluoride Glasses at Glass Transition Temperature." Journal of Non-Crystalline Solids(投稿中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kazumasa Matusita, Hideki Yamamoto, Takayuki Komatsu: "Non-Isothermal Crystallization in ZrF_4-BaF_2-GdF_3-AlF_4 Fluoride Glasses." Thermochimica Acta. Vol. 123 263-270 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kazumasa Matusita, Hideki Yamamoto, Takayuki Komatsu: "Crystal Growth in ZrF_4-BaF_2 Based Fluoride Glasses." Materials Science Forum. Vol. 32 & 33, 185-190 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kazumasa Matusita, Hiroshi Kato, Takayuki Komatsu: "Photoelastic Effects in Some Fluoride Glasses Based on the ZrF_4-BaF_2 Systems." Journal of Non-Crystalline Solids, Vol. 112, 341-346 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Manabu Koide, Kazumasa Matusita, Takayuki Komatsu: "Viscosity of Fluoride Glasses at Glass Transition Temperature." Journal of Non-Crystalline Solids,.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kazumasa Matusita,Hiroshi Kato,Takayuki Komatsu,: "Photoelastic Effects in Some Fluoride Glassed Based on the ZrF4-BaF2 System." Journal of Non-Crystalline Solids,. 112. 341-346 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Manabu Koide,Kazumasa Matusita,Takayuki Komatsu,: "Viscosity of Fluoride Glasses at Glass Transition Temperature." Journal of Non-Crystalline Solids.

    • Related Report
      1989 Annual Research Report
  • [Publications] 松下和正、須戸達哉、小松高行: Journal of Non-Crystalline Solids.

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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