Crystal growth of Bi2Sr2CuO6 from flux system KCl-KF and its superconductivity

DTA of the starting materials enabled an appropriate temperature programme to be introduced for crystal growth by spontaneous nucleation. By the improved thermogravimetric method, Bi2Sr2CuO6 crystals were grown after determination of the crystallisation temperature. A single crystal in the form of a...

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Bibliographic Details
Published in:Journal of materials science 1991-10, Vol.26 (19), p.5323-5326
Main Authors: CHEN CHANGKANG, WANKLYN, B. M, SMITH, D. T, WONDRE, F. R
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Growth from melts
zone melting and refining
Materials science
Methods of crystal growth
physics of crystal growth
Physics
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Summary:DTA of the starting materials enabled an appropriate temperature programme to be introduced for crystal growth by spontaneous nucleation. By the improved thermogravimetric method, Bi2Sr2CuO6 crystals were grown after determination of the crystallisation temperature. A single crystal in the form of a thin rectangular platelet up to 6 x 4 mm2 was obtained and identified by X-ray powder pattern and by SEM. Analyses were performed by using high-resolution EPMA, which indicated that it is the nonstoichiometric compound Bi2+xSr2-xCuO6. The superconducting properties are strongly dependent on the composition of Bi and Sr in the crystals and on heat treatment. The transition temperature of 7 K with 0.5 K width for as-grown crystals, was obtained. 7 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01143228