Abstract
Superconductive BaPb1-xBixO3 (BPB) single crystals could be grown in hydrothermal NaCl solution. The solubility of BPB in NaCl hydrothermal solution was much higher than that in KCl hydrothermal solution under the same condition. The optimum condition to grow BPB single crystals were as follows; temperatures at the dissolution zone in a gold capsule, 400° to 450°C; temperature difference ΔT, 20°-30°C; pressure, 100MPa. The composition of crystals grown in NaCl hydrothermal solution was found to deviate slightly in the Bi lean side from that of nutrients as well as in KCl solution. The hydrothermally grown single crystal with x=0.25 showed the transition temperature Tc of 11.4K to the superconducting state and the narrowest transition temperature width ΔTc of 1.8K.
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