STUDY OF DOPING EFFECT ON THE BI2SR2CA2CU3OY SUPERCONDUCTOR

We have systematically investigated the doping effect on the Bi2Sr2Ca2 Cu3Oy superconductive material. After entering into the crystal lattic e, Pb and/or Sb atoms cause not only variations of the temperature con dition during the sample preparation process, but also variations of s tructures and superconductivity. By analyzing the experimental results , we have come to the conclusion that the Pb and/or Sb atoms enter int o the Bi-O planes, preferably occupy the sites of Bi ions, regulate th e crystal structures and the distribution of oxygen ions in Bi-O plane s and nearby lattice sites, thus benefiting the formation of the high- T-c phase and improving the superconductivity.