Crystal Growth Faults in Superconductor Tl-Ba-Ca-Cu-O Oxide Crystals

Abstract
Superconductor oxides, Tl2Ba2CaCu2O8+x (2212) and Tl2Ba2Ca2Cu3O10+x (2223), in the Tl-Ba-Ca-Cu-O system are intimately intergrown in various types of fine scale stacking faults. Removal of these planar faults is a key point in growing large single crystals of the 2223 phase. Among various planar faults, planar boundary structures between the 2212 and 2223 phases were studied by an electron microscope. Slab widths of the 2212 phase terminated on a (110) plane in the 2223 phase tend to have the width of a 5:4 lattice fringe line ratio. A structure for the boundary and its stability is discussed in terms of the solid state reaction.

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