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1998 Fiscal Year Final Research Report Summary

Magnetization Process of High-Tc Superconductors due to Pulsed Field and Development of Superconducting Permanent Magnet

Research Project

Project/Area Number 09305041
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionNagoya University

Principal Investigator

MIZUTANI Uichiro  Grad.School of Eng., Nagoya Univ., Professor, 工学研究科, 教授 (00072679)

Project Period (FY) 1997 – 1998
KeywordsPulsed Magunetization Technique / High-T_c Superconducting Bulk Magnet / Pulsed Field / melt-processing / Pinning Mechanism / Superconducting Permanent Magnet
Research Abstract

The c-axis oriented REBa_2Cu_3O_<7*> quasi-single crystal grown by the melt-processing with the use of a seed crystal is known to capture magnetic fields of the order of 1 Tesla at 77 K and to enhance its capability by lowering the temperature. We believe that the trapping field ability of a superconducting permanent magnet can be further enhanced to the level more than 10 times as high as that of the ordinary Nd-Fe-B permanent magnet, if its microstructure is well controlled. The objective of the present work is to develop superconducting permanent magnetic materials generating 3-5 Tesla in the free space and to develop the pulsed field magnetization technique to magnetize the synthesized superconductor.
In 1997, we synthesized the melt-processed bulk superconductors and analyzed the dynamical motion of the magnetic fluxes in the superconductor driven by the pulsed field. We observed the magnetization curve different from that obtained under the static field. When the pulsed field is l … More ow, the magnetic fluxes enter into the superconductor very slowly but begin to enter very rapidly once the intensity of the pulsed field exceeds 2-4 Tesla. We obtained crucial information about the viscous motion of the magnetic fluxes and pinning mechanism in the presence of the pulsed field. We could also successfully synthesized the Y-123, Sm-123 and Nd-123 quasi-single crystal by dispersing the 211 particles in the matrix uniformly.
In 1998, We could enhance both superconducting and mechanical properties of the Sm-123 bulk superconductor by dispersing fine Ag particles in the matrix and could trap magnetic field of 1.7 Tesla at 77 K.The value could be increased to 9 Tesla at 25 K.All these data for the Sm-123 superconductors synthesized without any assistance of irradiation are the highest reported in the literature. This is 30 times as high as that of the Nd-Fe-B permanent magnet (reported in Chunichi-Shinbun, evening newspaper, March 27th, Heisei 10) . The research to magnetize this superconductor by the pulsed field has been also conducted. We have concluded that a magnetic field generator producing 3-5 Tesla in free space will be developed in very near future. Less

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Uichiro Mizutani: "Synthesis of C-axis oriented single-domain Sm123 superconductors capable of trapping 9 Tesla at 25K and its application to a strong maputic field generator" Materials Science and Engineering. 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroshi Ikuta: "Melt-processed Sm-Ba-Cu-O superconductors trapping strong magnetic field" Superconductor Science and Technology. vol.11. 1345-1347 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroshi Ikuta: "Melt-processing of Ag-added LRE-Ba-Cu-O (LRE=Nd,Sm)" Applied Superconductivity. vol.6. 109-117 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Uichiro Mizutani: "Pulsed-field magnetization applied to high-Tc superconductors" Applied Superconductivity. vol.6. 235-246 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 生田 博志: "高温超電導バルク材料" 電気学会誌. Vol.118No.12. 759-761 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Uichiro Mizutani, A.Mase, H.Ikuta, Y.Yanagi, M.Yoshikawa, Y.Itoh and T.Oka: "Synthesis of c-axis oriented single-domain Sm 123 superconductors capable trapping 9 Tesla at 25 K and its application to a strong magnetic field" Materials Science and Engineering. (1999 ; in print).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Ikuta, A.Mase, Y.Yanagi, M.Yoshikawa, Y.Itoh, T.Oka and U.Mizutani: "Melt-processed Sm-Ba-Cu-superconductors trapping strong magnetic" Superconductor Science and echnology. vol.11. 1345-1347 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H,Ikuta, S.Ikeda, A.Mase, M.Yoshikawa, Y.Yanagi, Y.Itoh, T.Oka and U.Mizutani: "Melt-processing of Ag-added LRE-Ba-Cu-O (LRE=Nd" Applied Superconductivity. vol.6. 109-117 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] U.Mizutani, T.Oka, Y.Itoh, Y.Yanagi, M.Yoshikawa H.Ikuta: "Pulsed field magnetization applied to high-Tc superconductor" Applied Superconductivity. vol.6. 235-246 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Ikuta, T.Oka and U.Mizutani: "Present situation in the development of high-Tc bulk superconductors" Oyo-Butsuri Gakkai-ishi. (1999, vol.4, in print).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Ikuta and U.Mizutani: "High-Tc supereconducting bulk materials" Denki-Gakkai-shi.vol.118, No.12. 759-761

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

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Published: 1999-12-08  

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