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Proceedings Paper

Microstructure and superconducting properties of Bi2-xPbxSr2CaCu2Oy spherical particles transformed from an amorphous state prepared by a containerless melt solidification method
Author(s): Hiroki Fujii; Hiroaki Kumakura; Kazumasa Togano
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Paper Abstract

We successfully prepared amorphous Bi-Pb-Sr-Ca-Cu-O spherical particles by a containerless melt solidification method. These particles were obtained by the melt solidification of Bi2-xPbxSr2CaCu2Oy [(Bi,Pb)-2212] powder during the free-fall using a propane gas torch. The diameter of these particles was about 100 micrometers . The crystalline (Bi,Pb)-2212 superconductors were obtained by the transformation from the amorphous state under several oxygen partial pressures. (Bi,Pb)-2212 phase was formed via (Bi,Pb)2Sr2CuOy phase for all P02 values. Low P02 was more effective to introduce Pb into Bi2Sr2CaCu2Oy lattice and only the heat treatment under P02 equals 0.01 atm was successful in obtaining Pb-rich (Bi,Pb)-2212 with modulation-free structure. The critical composition separating Pb-poor modulated and Pb-rich modulation-free structures in (Bi,Pb)- 2212 was x equals 0.5. However, no lamellar structure composed of modulated and modulation-free regions was present in any particles for all P02 values. Enhancement of critical current density was obtained by the Pb substitution.

Paper Details

Date Published: 6 July 1999
PDF: 8 pages
Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); doi: 10.1117/12.351283
Show Author Affiliations
Hiroki Fujii, National Research Institute for Metals and CREST/Japan Science and Technology Corp. (Japan)
Hiroaki Kumakura, National Research Institute for Metals and CREST/Japan Science and Technology Corp. (Japan)
Kazumasa Togano, National Research Institute for Metals and CREST/Japan Science and Technology Corp. (Japan)


Published in SPIE Proceedings Vol. 3792:
Materials Research in Low Gravity II
Narayanan Ramachandran, Editor(s)

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