Effect of Fe on the crystal growth morphology of Bi-Sr-Ca-Cu-O

Abstract

The effect of Fe on the crystal growth of was studied by a floating zone method. The result shows that the planar solid-liquid growth interface breaks down into a cellular growth interface with increasing Fe substitution in the feed rods of . The size of the single crystals decreases with the increase in Fe substitution in the feed rods. When Fe substitution content y is 0.06 in a feed rod, the Bi-2212 single crystals in an as-grown bar are too small to be visible. The maximum thickness along the c-axis of the pure Bi-2212 single crystals is as large as 2 mm. The solubility limit of Fe in Bi-2212 crystals is 0.025. The Fe substitution in Bi-2212 crystals depress sharply not only the superconductivity transition temperature but also the homogeneity of the superconducting phase in the crystals.