INVESTIGATION OF THE PHASE-DIAGRAM AND SUPERCONDUCTIVITY OF HG-PB-BI-BA2CACU2O6+DELTA

Compounds of the series Hg-(1-x-y)BixPbyBa2CaCu2O6+delta (0 less than or equal to x,y less than or equal to 0.5) are synthesized directly fr om the metal oxides without using a precursor. Structural and morpholo gical investigations are made by x-ray diffraction, SEM and EDXA techn iques. Bi and Pb substitution suppresses or enhances the simultaneous formation of Hg-1201 and Hg-1223 phase. Multiphase Hg0.8Bi0.2Ba2CaCu2O 6+delta has a maximum T-c of 134K. For Bi and Pb concentrations higher than 0.5 mole, non-superconducting phases are formed.