Study on the Doping of V, Nb or Ta to Bi-system and Their Effect of Promoting the Formation of 2223

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Since the discovery of BiSrCaCuO superconductor, for stabilizing and promoting the formation of high T<sub>c</sub> 2223 phase substituting a part of Bi with Pb is the most effective way. We have systematically studied the effect of the high va
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