Effects of High Pressure Treatment on the Superconductivity of BiSrCaCu2Oy

Based on the convention preparation of high Tc super conductor BiSrCaCu2Oy, the effects of heat-pressure and cool-pressure on the formation, structure and superconductivity of this sample have been studied. The results show that high pressure can make the synthesis time shorter and the synthesis temperature lower, but at the same time it may restrain the formation of the phase with larger lattice parameters (high Tc phase) and increase the content of impurity phase with smaller lattice parameters. For getting better superconductivity, the 1.5 PGa is a good pressure condition.