Abstract
The growth of mm-sized crystals in the Tl-Ca-Ba-Cu-O and Bi-Ca-Sr-Cu-O superconductor systems is discussed. The presence of polycrystals, which can be described as syntactic intergrowth crystals, is widely found. In the Tl-Ca-Ba-Cu-O s crystals of three distinct phases with superconducting transitions at 103, 106–108 and 112–114 K have been grown. In the Bi-Ca-Sr-Cu-O system crystals have been grown for two phases that exhibit transition temperatures at 80 and 92 K. Oxygen annealing is shown to substantially improve the superconducting properties in both systems.
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