Abstract
Superconducting crystals of Bi Sr Ca Cu O with and without Pb or Y dopant have been grown in platinum or alumina crucibles from KCl or self-flux. The improved thermogravimetric analysis (ITGA) enables the crystallization temperature to be measured and then the crystals to be grown by introducing a Pt wire as a nucleation centre or by top-seeding. At the end of crystal growth the crystals could be separated from the flux. Differential thermal analysis (DTA) is useful for getting some information to design the temperature program. The crystals of Bi Sr Ca Cu O, Bi(Pb) Sr Ca Cu O and Bi Sr Ca(Y) Cu O were identified as mainly 2212 phase with the two Cu O layer structure by X-ray diffraction and by electron probe microanalysis (EPMA). The as-grown crystals are superconducting with transition temperatures between 80 and 90 K.
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