Abstract

Effects of growth velocity and a variety of nominal composition of a feed rod on the growth behavior of Bi-2212 single crystal has been studied with an infrared radiation mirror furnace. A variety of growth morphologies at a solid-liquid interface of an as-grown rod have been observed by an optical polarization microscope. The planar solid-liquid interface tends to break down into the cellular interface while increasing the velocity from 0.2 mm/h or deviating from the nominal optimal composition of the feed rod Bi2.1Sr1.9Ca1.0Cu2.0Ox. The thickness of the single crystals along the c-axis varies from 0.05 mm to 2 mm for the different growth velocities and nominal composition of a feed rod. The superconducting transition temperature of the as-grown single crystals varies from 84 K to 92 K for the different growth velocities and the nominal composition of a feed rod. The homogeneity of superconducting phase of the crystals also depends on the growth velocities and the composition of a feed rod.

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