Abstract
The effect of simultaneous substitution of Pb for Bi and Y for calcium in Bi 2Sr 2CaCu 2O 8+ δ has been studied. Phase pure single crystals of Bi 1.7Pb 0.3Ca 1− x Y x Cu 2O 8+ δ has been grown for x = 0 to 5. Variation in lattice parameters and the change in superconducting transition temperature for different x values has been studied. The optical micrograph revealed the layer growth mechanism and occurrence of some growth twins which are not removed even after annealing. Chemical etching with a bromide-ethanol solution revelaed elongated diamond shaped etch pits reflecting the orthorhombic symmetry of the crystal.
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