Abstract
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 temperature superconducting (HTS) Bi - Sr - Ca - Cu - O system was investigated by preparing (1) small single crystals from flux solvents, and (2) thick films by doctor blade casting. It was found that the Bi 2Sr 2CaCu 2O x (2212) is the predominant phase in all doped samples Examples of HTS 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°K in the proportion of 20 to 80% respectively.
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