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Superconducting ceramics in the Bi1.5SrCaCu2O sub x system by melt quenching technique

Author
Deguire, Mark R.
Published
Oct 1, 1989.
Physical Description
1 electronic document
Additional Creators
Bansal, Narottam P.
Online Version

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Summary
Bi sub 1.5 SrCaCu sub 2 O sub x has been prepared in the glassy state by rapid quenching of the melt. The kinetics of crystallization of various phases in the glass have been evaluated by a variable heating rate differential scanning calorimetry method. The formation various phases on thermal treatments of the glass has been investigated by powder X-ray diffraction and electrical resistivity measurements. Heating at 450 C formed Bi sub 2 Sr sub 2 CuO sub 6, which disappeared on further heating at 765 C, where Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8 formed. Prolonged heating at 845 C resulted in the formation of a small amount of a phase with T sub c onset of approx. 108 K, believed to be Bi sub 2 Sr sub 2 Ca sub 2 Cu sub 3 O sub 10. This specimen showed zero resistivity at 54 K. The glass ceramic approach could offer several advantages in the fabrication of the high-T sub c superconductors in desired practical shapes such as continuous fibers, wires, tapes, etc.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19900002290.
Accession ID: 90N11606.
NASA-CR-185139.
NAS 1.26:185139.
E-5064.
Annual Meeting of the American Ceramic Society; 23-27 Apr. 1989; Indianapolis, IN; United States.
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View MARC record | catkey: 15688594