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2005 Fiscal Year Final Research Report Summary

Infiltration-growth of Superconductive REBCO Oxide and Simulation of Faceted Peritectic Crystal Growth

Research Project

Project/Area Number 15360404
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

MORI Nobuyuki  KYUSHU UNIVERSITY, Faculty Engineering, Materials Sci.& Eng., Ass.Prof, 大学院・工学研究院, 助教授 (20108666)

Co-Investigator(Kenkyū-buntansha) OGI Keisaku  KYUSHU UNIVERSITY, Faculty Engineering, Materials Sci.& Eng., Prof, 大学院・工学研究院, 教授 (40038005)
Project Period (FY) 2003 – 2005
Keywordscrystal growth / facet / YBCO / REBCO / superconductor / superconducting oxide / 123 / 211 / nucleation
Research Abstract

Growth process and structures of RE123(REBa_2Cu_3O_<7-x>) crystals in superconductive REBCO(RE=Y,Nd) and REBCO/Ag oxides fabricated by infiltration-growth and unidirectional solidification in the atmosphere of air or Ar-1%O_2 were studied experimentally and analytically to clarify the growth and structure-formation mechanism of faceted 123 crystals. To get a sample without shrinkage and with fine microstructure by the infiltration-growth, Ba-Cu-O(-RE,Ag) liquid was infiltrated into sintered porous Y211(/Ag) or Nd422(/Ag) solid, and then cooled under the peritectic temperature(Tp) to grow 123 crystal under a temperature gradient. The critical transition conditions of macrostructures from columnar to equiaxed structures and the change in freezing front temperature of 123 phase during solidification were analyzed to clarify the effects of growth rate(R), temperature gradient(G) and sample size(cross section) by using R-ΔT(undercooling for growth) and ΔT(for formation of a new crystal)-Vc( … More cooling rate) relations.The formation processes of macrostructure such as columnar and/or equiaxed structures of faceted 123 crystals during unidirectional solidification were well simulated by two-dimensional numerical method, in which the effects of crystallographic orientations and the nucleation of crystals in the liquid were considered. Further, the nucleation and growth processes of faceted RE123 (RD=Nd,Sm,Gd) crystals were observed in-situ on MgO(100) by using a high temperature in-situ observation apparatus with zoom-type optical microscope. RE123 crystals nucleated and grew at various undercooling, and the growth rate (u) and incubation time (t_<inc>) for nucleation were measured. u was approximated by a function of ΔTr: u=A_<gp>ΔTr^2/η(T), where A_<gp> is a constant, ΔTr=ΔT/Tp and η(T) is viscosity.Nucleation rate (I_v) was obtained from the relationship between time and number of nucleated crystals, and it was approximated by an exponential function: I_V={A_n/η(T)}exp(-B/ΔTr^2), where An and B are constants. It was clarified that u and Iv depend on not only ΔT but also Tp of RE123. Less

  • Research Products

    (12 results)

All 2006 2005

All Journal Article (12 results)

  • [Journal Article] Growth of Faceted 123 Crystals in Superconductive YBCO/Ag Composites Fabricated by Infiltration-growth Method2006

    • Author(s)
      N.Mori, K.Dateki, T.Hirao, K.Ogi
    • Journal Title

      Physica C to be published (received for publication)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] In-situ observation and analysis of crystal growth process of GdBCO superconductive oxide2006

    • Author(s)
      Y.Nakahara, T.Inokawa, N.Mori, K.Ogi
    • Journal Title

      Physica C to be published (received for publication)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] NdBCO及びSmBCO超伝導酸化物における結晶成長過程の直接観察及び解析2006

    • Author(s)
      森 信幸, 中原義昭, 深町星児, 向田昌志, 大城桂作
    • Journal Title

      日本金属学会誌 投稿中

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Growth Process and Microstructure of Y123 Film Fabricated by Advanced MOD-TFA Process2006

    • Author(s)
      T.Minei, Y.Tanaka, M.Ogata, N.Mori, K.Yamada, M.Mukaida
    • Journal Title

      Physica C to be published (received for publication)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Growth of Faceted 123 Crystals in Superconductive YBCO/Ag Composites Fabricated by Infiltration-growth Method2006

    • Author(s)
      N.Mori, K.Dateki, T.Hirao, K.Ogi
    • Journal Title

      Physica C (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] In-situ observation and analysis of crystal growth process of GdBCO superconductive oxide2006

    • Author(s)
      Y.Nakahara, T.Inokawa, N.Mori, K.Ogi
    • Journal Title

      Physica C (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] In-situ Observation and Analysis of Crystal Growth Process in NdBCO and SmBCO Superconductive Oxide2006

    • Author(s)
      Nobuyuki Mori, Yoshiaki Nakahara, Seiji Fukamachi, Masashi Mukaida, Keisaku Ogi
    • Journal Title

      J.Jpn.Inst.Met. (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Growth Process and Microstructure of Y123 Film Fabricated by Advanced MOD-TFA Process2006

    • Author(s)
      T.Minei, Y.Tanaka, M.Ogata, N.Mori, K.Yamada, M.Mukaida
    • Journal Title

      Physica C (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Formation of faceted 123 crystals in superconductive REBCO oxide fabricated by infiltration-growth method2005

    • Author(s)
      Nobuyuki Mori, Toshihiko Hirao, Ryosuke Hirooka, Kousuke Dateki, Keisaku Ogi
    • Journal Title

      Materials Science Forum 475-479

      Pages: 2563-2566

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Analytical Study of the Growth and Formation Processes of Faceted 123 Crystals in Superconductive REBCO Oxide2005

    • Author(s)
      Nobuyuki Mori, Keisaku Ogi
    • Journal Title

      Materials Transactions Vol.46

      Pages: 930-934

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Formation of faceted 123 crystals in superconductive REBCO oxide fabricated by infiltration- growth method2005

    • Author(s)
      Nobuyuki Mori, Toshihiko Hirao, Ryosuke Hirooka, Kousuke Dateki, Keisaku Ogi
    • Journal Title

      Materials Science Forum 475-479

      Pages: 2563-2566

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Analytical Study of the Growth and Formation Processes of Faceted 123 Crystals in Superconductive REBCO Oxide2005

    • Author(s)
      Nobuyuki Mori, Keisaku Ogi
    • Journal Title

      Materials Transactions 46

      Pages: 930-934

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2007-12-13  

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