DOPING OF BISRCACUO COMPOUNDS WITH (V+Y), AS, SB, PB, CR AND GE

The effect of various doping elements such as (V + Y), As, Sb, Pb, Ag and Ge in range of 3-5 atom% on the phase stability of the high temper ature superconducting (HTS) Bi - Sr - Ca - Cu - O system was investiga ted by preparing (1) small single crystals from flux solvents, and (2) thick films by doctor blade casting It was found that the Bi2Sr2CaCu2 Ox (2212) is the predominant phase in all doped samples Examples of HT S critical temperature Tc results measured by microwave absorption are 94 K for (V + Y), 78 K for As, 74 K for Ge. For the Sb doped compound a two phase BSCCO material was obtained with two T(c) of 90 and 78-de grees-K in the proportion of 20 to 80% respectively.