Abstract
The influence of starting composition (i.e. variations in the Ca and Cu content, and with Pb additions) on the properties of flux grown superconducting Bi 2CaSr 2Cu 2O 8 single crystals was investigated. Excess Cu promoted 2-0-2-1 intergrowths, whereas excess Ca gave more “pure” 2-1-2-2 crystals with less intergrowths. Pb additions suppressed the growth of 2-1-2-2 and yielded more 2-0-2-1, despite the presence of excess Ca. The optimum composition was evaluated from XRD and SQUID results.
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