Abstract
A floating zone method was used to study the effects of the growth velocityand the starting compositions of the feed rod on the crystal growth behavior of Bi-2212. It shows that a necessary condition for obtaining large single crystals along the c-axis is that the solid-liquid interface of a rod maintains a smooth interface during crystal growth. A planar growth interface tends to break down into a cellular interface, while increasing the velocity from 0.2 mm/h, or while deviating from the optimum composition of Bi 2.1Sr 1.9Ca 1.0Cu 2.0O x in a feed rod. Single crystals of up to 20×5.5×1.5 mm 3 along the a-, b- and c-axes have been grown in a 6.4 mm diameter rod with optimum growth conditions. X-ray Laue measurements show that the quality of the single crystals is good. T c onset is 91 K for as-grown crystals.
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