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Jpn. J. Appl. Phys. 44 (2005) pp. L1525-L1528  |Previous Article| |Next Article|  |Table of Contents|
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Letter

Possible Breakthrough for Higher T_c Discovered in Bi(Pb)2223 Practical Tapes

Jun-ichi Shimoyama, Takeshi Kato¹, Shinichi Kobayashi¹, Kouhei Yamazaki¹, Kazuhiko Hayashi¹ and Ken-ichi Sato¹

Department of Applied Chemistry, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
¹Sumitomo Electric Industries, Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka 554-0024, Japan

(Received September 29, 2005; accepted October 22, 2005; published December 2, 2005)

By systematic studies on the post-annealing effect in air for Bi(Pb)2223 practical tapes, T_c(onset) was found to be enhanced up to 115.2 K by annealing at 680°C for 250 h from 110.2 K for an as-synthesized tape. Annealing at ∼700°C for a long time always increased the T_c(onset) of the tape above 114 K, at which the generation of the Pb3221 phase simultaneously occurred during annealing. The slightly increased c-axis length was confirmed for annealed samples. The compositional change of cations in Bi(Pb)2223 during post-annealing is believed to be responsible for the T_c enhancement of the present system.

URL: http://jjap.jsap.jp/link?JJAP/44/L1525/
DOI: 10.1143/JJAP.44.L1525

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References | Citing Articles (9)

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