High-Field A-15 Superconductors Prepared from Intermediate Compound(High Field Superconductors)

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概要

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• A15 Nb_3(Al, Ge) and Nb_3Sn have been easily synthesized starting from Nb_2(Al, Ge) and Nb_6Sn_5 intermediate compound powder, respectively. The intermediate compound powder was mixed with Nb powder by a ball mill in Ar atmosphere. The mixed powder was encased in a Nb or Ta tube, and then fabricated into a tape without intermediate annealing. The mechanical mixing of powders promotes the formation of A15 phase in subsequent reaction treatment. The bulk sintered specimens show higher onset T_c but broader T_c transition than tape specimens. In the Nb_3(Al, Ge) tape reacted at 1300℃, a J_c of over 2.7×10^4 A/cm^2 has been obtained at 4, 2K and 23T. The addition of MgO powder enhances J_c and reduces the peak effect in the Nb_3(Al, Ge) tape. The T_c of Nb_3Sn tape prepared by present process is appreciably higher than that of bronze-processed Nb_3Sn. Even pure Nb_3Sn tape shows Bc_2 of nearly 25T at 4.2K after the reaction at 900℃. The present A15 Nb_3(Al, Ge) and Nb_3Sn tapes seem to be promising for generating 20T at 4.2K.High-field superconductorNb_3(Al, Ge)Nb_3SnIntermediate compoundMechanical alloying

• 東北大学の論文
• 1996-07-15

著者

• Tomori H.

  Faculty Of Engineering Tokai University

• Tachikawa K.

  Faculty of Engineering, Tokai University

• Natsuume M.

  Faculty of Engineering, Tokai University

• Kuroda Y.

  Faculty of Engineering, Tokai University

• Natsuume M.

  Faculty Of Engineering Tokai University

関連論文

• High-Field A-15 Superconductors Prepared from Intermediate Compound(High Field Superconductors)
• An Improvement of Critical Current Density in Bronze-processed Nb_3Sn(Low-T_c Superconducting Materials Research)

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