Abstract
Differential thermal analysis and slow-cooling crystal growth experiments were applied in order to determine the primary crystallization field of Bi 2Sr 2CaCu 2Q x in the Bi-Sr-Ca-Cu-O system. The self-flux composition Bi 0.29Sr 0.29Ca 0.145Cu 0.24O y thus determined was successfully applied in both the liquid phase epitaxial (LPE) and the traveling solvent floating zone (TSFZ) growth of Bi 2Sr 2CaCu 2O x single crystals. The liquidus temperature of this self-flux solution is near 903 °C. Optimized composition and growth conditions were determined. Epitaxial films of Bi 2.11Sr 2.00Ca 0.85Cu 2.04O x were obtained for the LPE growth. Large single crystals with the composition Bi 2.01Sr 2.03Ca 0.93Cu 2.03O x were obtained for the TSFZ growth with a low velocity (0.2 mm h −1). The compositions of both LPE and TSFZ samples were near the Sr-saturated corner of the solid solution of the 2212 phase. This is consistent with the fact that both the T c value and the c-axis parameter of our samples were near the upper end of the 2212 phase solid solution.
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