INFLUENCE OF HIGH-PRESSURES AND TEMPERATURES ON THE BEHAVIOR OF BISMUTH-BASED SUPERCONDUCTORS

The present study demonstrates the possibility of preparing Bi-based SC-ceramics with almost theoretical density and high level of superconductive and mechanical properties in a short time by temperature treatment under high pressure conditions. It is shown that there is a P-T-tau-region where the 2223 phase content may be increased. The variation of unit cell volume of 2223 phase is also observed. The critical current density of the samples can be increased after the P-T-tau treatment by a factor of 25 times.