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Controlling the Critical Current Density under Magnetic Field of Melt Processed Bulk High Temperature Superconductors

Research Project

Project/Area Number 14350006
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionNagoya University

Principal Investigator

IKUTA Hiroshi  School of Engineering, Department of Crystalline Materials, Associate Professor, 工学研究科, 助教授 (30231129)

Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥11,400,000 (Direct Cost: ¥11,400,000)
Fiscal Year 2003: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2002: ¥7,400,000 (Direct Cost: ¥7,400,000)
KeywordsMelt-Processed Bulk Superconductor / High Temperature Superconductor / Critical Current Density / Trapped Field / Element Substitution / Pinning Effect / 補足磁場 / 溶解バルグ超伝導体 / 臨海電流密度 / 酸素処理
Research Abstract

The change of the critical current density (J_c) as well as the trapped field of melt-processed bulk superconductors brought about by an element substitution, oxygen annealing, changing the composition of the starting materials and so on were systematically studied. First, we optimized the starting composition of the Dy-system. Then, CeO_2 was added, which decreased the loss of the melt during the processing, resulting in a more than 10% increase in the trapped field. The addition of ZnO to this composition increased J_c between 0 and 3 T, and the trapped field increased for 20%. The optimum content of ZnO for increasing J_c and the trapped field was determined to be about 0.025 wt.% independent of the sample size and regardless whether CeO_2 is added or not. When ZnO was added to the Sm-system, the trapped field increased by a factor of 1.5. It was elucidated that the increase in J_c with Zn doping is particularly large in the region beneath the seed crystal where the Sm211 phase is d … More eficient, and this brought about the increase of the trapped field. We have also succeeded for the first time the preparation of single-domain bulk samples of the ternary Nd-Eu-Gd system with a diameter equal to or larger than 30 mm. The trapped field of these samples was larger when the ratio of Gd in the 211 phase of the starting materials was smaller, but the material strength increased when the content of Gd was large. Consequently, the magnetic flux density that the sample could trap without being cracked at low temperature increased. Similarly, the trapped field at the liquid nitrogen temperature of the ternary Sm-Eu-Gd system was large when the content of Gd of the 211 phase was 50%. The diffusivity of oxygen in a melt-processed superconductor was found to be between single-and poly-crystalline samples, and decreases when Ag is added because the microstructure is denser. It was important to perform the oxygen annealing at low temperature for the Sm-system in order to obtain a sample with large J_c and trapped field. However, the diffusivity decreases at lower temperature, and therefore, we studied the effect of high pressure oxygen annealing under 10 atm. Based on that result, we proposed a two-step annealing process, and confirmed its effectiveness. We also prepared samples of the Sm-system with adding Y_2Ba_4CuZrO_y, which was reported to have a small size in melt-processed superconductors, and found that the addition of this material compensates the Sm211 phase that is deficient under the seed crystal, and the trapped field increased with a very small content of about 1mol%. Less

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (47 results)

All Other

All Publications (47 results)

  • [Publications] T.Yamada 他: "Single domain, c-axis oriented (Nd-Eu-Gd)-Ba-Cu-O bulk superconductors"Supercond.Sci.Technol.. 16. 827-831 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] B.Latha 他: "Position Dependence of Superconducting Properties of Large Single Domain Sm-Ba-Cu-O Bulk Superconductors Prepared under various Conditions"Physica C. 392-396. 521-525 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yamada 他: "Field trapping capability of melt-processed (Nd-Eu-Gd)-Ba-Cu-O bulk superconductors"Physica C. 392-396. 623-627 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Oka 他: "A 3 Tesla Magnetic Field Generator Using Melt-Processed Bulk Superconductors as Trapped Field Magnets and Its Applications"Physica C. 392-396. 709-712 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Oka 他: "A Strong Magnetic Field Generator Using Superconducting Bulk Magnets"Proceedings of the 6th Meeting of Symposium on New Magneto-Science 2002. 81-85 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Oka 他: "Construction of a Strong Magnetic Field Generator with Use of Melt-Processed Bulk Superconductors"IEEE Trans.Appl.Superconduct.. 13. 1584-1587 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Matsuzawa 他: "Application of high-T_c superconducting bulk magnets to the confinement of weakly ionized plasma"Appl.Phys.Lett.. 82. 2850-2852 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 岡徹雄 他: "超電導バルク磁石を使った3.15T強磁場発生装置の開発"低温工学. 37. 689-696 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 生田博志: "基礎講座 超伝導バルク材料とその応用技術"応用物理. 72. 742-746 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Matsuzawa 他: "Magnetic confinement of weakly ionized plasma with superconducting bulk magnets"Proceedings of the Third Asia-Pacific International Symposium on the Basic and Application of Plasma Technology. 45-48 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] B.Latha 他: "Effects of Zn Doping on the Superconducting Properties of the Melt Textured Dy-Ba-Cu-O Bulk Superconductors"Jpn.J.Appl.Phys.. 43. 970-975 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Ikuta 他: "Melt processing of (rare earth)Ba-Cu-O bulk superconductors"Supercond.Sci.Technol.. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] B.Latha 他: "Fabrication and Superconducting Properties of Cold-Seeded Melt Growth Dy-Ba-Cu-O Bulk Superconductors"Supercond.Sci.Technol.. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Iwasaki 他: "Annealing melt-processed Sm-Ba-Cu-O bulk superconductors under 10 atm oxygen"Physica C. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] B.Latha 他: "Enhancement of Critical Currents and Trapped Fields of Melt textured ZnO doped Dy-Ba-Cu-O Bulk Superconductors"Physica C. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] A.Takagi 他: "Preparation of melt-textured YBa_2Cu_3O_<7-δ> with CeO_2 additions and their superconducting properties"Physica C. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 生田博志 他: "溶融バルク超伝導体への不純物添加効果"日本金属学会誌. (投稿済み).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Ikuta: "High Temperature Superconductivity 1 Materials (第3章)"Springer-Verlag. 35 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yamada, H.Ikuta, Y.Itoh, U.Mizutani: "Single domain, c-axis oriented (Nd-Eu-Gd)-Ba-Cu-O bulk superconductors"Supercond.Sci.Technol.. 16. 827-831 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] B.Latha, M.Yoshikawa, Y.Yanagi, T.Yamada, Y.Itoh, H.Ikuta, U.Mizutani: "Position Dependence of Superconducting Properties of Large Single Domain Sm-Ba-Cu-O Bulk Superconductors Prepared under various Conditions"Physica C. 392-396. 521-525 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yamada, H.Ikuta, M.Yoshikawa, Y.Yanagi, Y.Itoh, U.Mizutani: "Field trapping capability of melt-processed (Nd-Eu-Gd)-Ba-Cu-O bulk superconductors"Physica C. 392-396. 623-627 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Oka, K.Yokoyama, Y.Itoh, Y.Yanagi, M.Yoshikawa, H.Ikuta, U.Mizutani, H.Okada, K.Noto: "A 3 Tesla Magnetic Field Generator Using Melt-Processed Bulk Superconductors as Trapped Field Magnets and Its Applications"Physica C. 392-396. 709-712 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Oka, K.Yokoyama, Y.Itoh, Y.Yanagi, M.Yoshikawa, H.Ikuta, U.Mizutani, K.Noto: "A Strong Magnetic Field Generator Using Superconducting Bulk Magnets"Proceedings of the 6th Meeting of Symposium on New Magneto-Science 2002 (Nov.6-8, 2002,Tsukuba). 81-85 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Oka, K.Yokoyama, Y.Itoh, H.Ikuta, U.Mizutani, H.Okada, K.Katagiri, K.Noto: "Construction of a Strong Magnetic Field Generator with Use of Melt-Processed Bulk Superconductors"IEEE Trans.Appl.Superconduct.. 13. 1584-1587 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Matsuzawa, K.Ohishi, K.Ishikawa, T.Morita, M.Yoshikawa, H.Ikuta, U.Mizutani: "Magnetic confinement of weakly ionized plasma with superconducting bulk magnets"Appl.Phys.Lett.. 82. 2850-2852 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Oka, K.Yokoyama, Y.Itoh, Y.Yanagi, M.Yoshikawa, H.Ikuta, U.Mizutani, H.Okada, K.Noto: "A Development of 3.15 T Strong Magnetic Field Generator Using Superconducting Bulk Magnets"Cryogenic Engineering, [Japanese]. 37. 689-696 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Ikuta: "Superconducting Bulk Materials and Their Applications"Oyo Buturi, [Japanese]. 72. 742-746 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Matsuzawa, K.Ohishi, K.Ishikawa, K.Itou, T.Morita, M.Yoshikawa, H.Ikuta, U.Mizutani: "Application of high-T_c superconducting bulk magnets to the confinement of weakly ionized plasma"Proceedings of the Third Asia-Pacific International Symposium on the Basicand Application of Plasma Technology (Dec.15-17, 2003, Taoyuan, Taiwan). 45-48 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] B.Latha, H.Ikuta, U.Mizutani: "Effects of Zn Doping on the Superconducting Properties of the Melt Textured Dy-Ba-Cu-O Bulk Superconductors"Jpn.J.Appl.Phys.. 43. 970-975 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Ikuta, T.Yamada, M.Yoshikawa, Y.Yanagi, Y.Itoh, B.Latha, U.Mizutani: "Melt processing of (rare earth)-Ba-Cu-O bulk superconductors"Supercond.Sci.Technol.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] B.Latha, H.Ikuta, U.Mizutani: "Fabrication and Superconducting Properties of Cold-Seeded Melt Growth Dy-Ba-Cu-O Bulk Superconductors"Supercond.Sci.Technol.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Iwasaki, H.Ikuta, M.Yoshikawa, Y.Yanagi, Y.Itoh, U.Mizutani: "Annealing melt-processed Sm-Ba-Cu-O bulk superconductors under 10 atm oxygen"Physica C. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] B.Latha, H.Ikuta, U.Mizutani: "Enhancement of Critical Currents and Trapped Fields of Melt textured ZnO doped Dy-Ba-Cu-O Bulk Superconductors"Physica C. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] A.Takagi, T.Miyamoto, H.Ikuta, U.Mizutani: "Preparation of melt-textured YBa_2Cu_3O_<7-δ> bulk with CeO_2 additions and their superconducting properties"Physica C. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Ikuta: "The effect of adding impurities to Melt-Processed Bulk Superconductors"J.Japan Inst.Metals, [Japanese]. (submitted).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Ikuta: "Melt Processed RE-Ba-Cu-O Bulk Superconductors (High Temperature Superconductivity 1 Materials, ed.A.V.Narlikar)"Springer-Verlag, Berlin, 2003). 79-113 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yamada 他: "Single domain, c-axis oriented (Nd-Eu-Gd)-Ba-Cu-O bulk superconductors"Superconductor Science and Technology. 16. 827-831 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Yamada 他: "Field trapping capability of melt-processed (Nd-Eu-Gd)-Ba-Cu-O bulk superconductors"Physica C. 391-396. 623-627 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] B.Latha 他: "Position Dependence of Superconducting Properties of Large Single Domain Sm-Ba-Cu-O Bulk Superconductors Prepared under various Conditions"Physica C. 391-396. 521-525 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 生田博志: "超伝導バルク材料とその応用技術"応用物理. 72. 742-746 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] B.Latha 他: "Effects of Zn Doping on the Superconducting Properties of the Melt Textured Dy-Ba-Cu_O Bulk superconductors"Jpn.J.Appl.Phys.. 43. 970-975 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Iwasaki 他: "Annealing melt-processed Sm-Ba-Cu-O bulk superconductors under 10 atm oxygen"Physica C. (印刷中).

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Ikuta(共著): "High Temperature Superconductivity 1 Materials"Springer-Verlag, Berlin. 503 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Ikuta他: "Extracting the utmost from high performance of Sm-Ba-Cu-O bulk superconductors by pulse field magnetization"Superconductor Science and Technology. 15. 606-612 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Yamada他: "Oxygen diffusivity in melt-processed SmBCO and YBCO bulk-superconductors"Physica C. 378-381. 713-717 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] U.Mizutani他: "Application of RE123-bulk Superconductors as a Permanent Magnet in Magnetron Sputtering film Deposition Apparatus"Journal of American Ceramic Society. (印刷中).

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Oka他: "Construction of a Strong Magnetic Field Generator with Use of Melt-Processed Bulk Superconductors"IEEE Transactions on Applied Superconductivity. (印刷中).

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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