Abstract
High temperature superconducting single crystals of 2212 phase of Bi-system have been grown by self-flux technique. They are annealed in different gas atmospheres of O2, N2 and Ar to obtain overdoped and underdoped samples. Both time as well as temperature of the annealing has been optimized to get different Tc-value in the range of 81–94 K. The oxygen contents δ for overdoped and underdoped crystals have been precisely determined by iodometric titration technique. The change in Tc and ΔTc have been discussed in terms of change in O-value in as-grown as well as in the optimally annealed crystals due to in- and out-diffusion of oxygen. The effect of annealing on surface morphology and defects features like growth steps, slip lines/bands and etch pits have also been studied by scanning electron microscopy.
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