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

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Abstract

Single crystals of Bi2Sr2CuO6 (BSCO) were grown from high-temperature solution using KCl-KF as flux. Differential thermal analysis (DTA) of the starting materials enabled an appropriate temperature programme to be introduced for crystal growth by spontaneous nucleation. By means of the improved thermogravimetric (TG) method, Bi2Sr2CuO6 crystals were grown after determination of the crystallization temperature. A single crystal in the form of a thin rectangular platelet up to 6×4 mm2 was obtained and was identified by X-ray powder pattern and by scanning electron microscopy (SEM). Analyses were performed by using high-resolution electron probe microanalysis (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, has been obtained.

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Authors and Affiliations

  1. Clarendon Laboratory, University of Oxford, 0X1 3PU, Oxford, UK

    Chen Changkang, B. M. Wanklyn, D. T. Smith & F. R. Wondre

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  1. Chen Changkang
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  2. B. M. Wanklyn
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  3. D. T. Smith
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  4. F. R. Wondre
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Changkang, C., Wanklyn, B.M., Smith, D.T. et al. Crystal growth of Bi2Sr2CuO6 from flux system KCl-KF and its superconductivity. J Mater Sci 26, 5323–5326 (1991). https://doi.org/10.1007/BF01143228

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  • DOI: https://doi.org/10.1007/BF01143228

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