EFFECT OF SILVER IN BI1.7PB0.3SR2-XAGXCA2CU3OY

The oxide superconductor Bi1.7Pb0.3Sr?(2-x)AgxCa2Cu3Oy has been synthe sized under the ordinary pressure. The x-ray diffraction spectra of th ese specimens show the presence of only 2212 phase when x<0.4, and the transition temperature achieved 99 K. With the x increase, the struct ure of sample transfers to 2223 phase. The investigation indicates tha t substitution of Sr2+ by Ag1+ increases the distance between layers. This may respond to T-c increase in 2212 phase and 2223 phase form at a relatively low temperature. (C) 1995 American Institute of Physics.