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Studies on Whisker of Ice Crystals

Research Project

Project/Area Number 60460229
Research Category

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

Allocation TypeSingle-year Grants
Research Field 結晶学
Research InstitutionHokkaido University

Principal Investigator

KURODA Toshio (1987)  The Institute of Low Temperature Science, Hokkaido University, 低温科学研究所, 教授 (70080447)

小林 禎作 (1985-1986)  北海道大学, 低温科学研究所, 教授 (70001641)

Co-Investigator(Kenkyū-buntansha) KOUCHI Akira  The Institute of Low Temperature Science, Hokkaido University, 低温科学研究所, 助手 (60161866)
FURUKAWA Yoshinori  The Institute of Low Temperature Science, Hokkaido University, 低温科学研究所, 助手 (20113623)
黒田 登志雄  北海道大学, 低温科学研究所, 助教授 (70080447)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1987: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥4,700,000 (Direct Cost: ¥4,700,000)
KeywordsWhisker / Ice crystal / Kinetic coefficient / Condensation coefficient / Screw dislocation / らせん転位 / スパイラル成長 / 氷
Research Abstract

Purpose of this study is to investigate an origin of ice whisker and a mechanism of growth of its tip surface ((0001)). The following results were obtained.
1) We made an experimental apparatus for growth of ice whisker from the vapor phase at -80゜C at lowest and for in-situ observation of grawing whisker using a refrigerator LAUDA-SK80D which was bought by this Grant.
2) We succeded in growing ice whisker on (0001)substrate of PBI_2 crystal at -50[[ -70゜C. Its growth direction is c-axis and tip surface is composed of (0001) face.
3) Since a probablity of growth of ice whisker was less than 1%, a necessary condition of ice whisker growth is that screw dislocations intersect only (0001) faces of ice crystals nucleated on PbI_2 substrate.
4) The Growth rates R_<exp> of tip surface were measured as functions of supersaturation<sigma>_<<infinite>> 5) The experimental results were analyzed by taking into account the diffusion process of water molecules and the surface kinetic process for incorporating the molecules into crystal lattice, and it was found that the dependences on surface supersaturation of kinetic coefficient and condensation coefficient were interpreted by spiral growth with the aid of screw dislocations.

Report

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

    (3 results)

All Other

All Publications (3 results)

  • [Publications] Toshio Kuroda: Journal of Crystal Growth.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshio,Kuroda: "Growth Mechanism of Ice Whisker" Journal of Crystal Growth.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Kobayashi: Journal of Crystal Growth.

    • Related Report
      1986 Annual Research Report

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

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