Abstract: Incorporating Sb to BiPbSrCaCuO system led to the appearance of a second phase.Besides this impure phase the XRD pattern of the main phase of Bil₆ Pb_0.4Sb₁₀Sr_1.5-2.0Ca₂Cu₂O_y could be indexed with a tetragonal structure with cell parameters a=0.54 andc=3.06nm, i.e. it corresponds to the low-T_c phase of BiSrCaCuO system,the so called 2212phase.It is of interest to indicate that this phase(with Sb and Pb incorporation)showed aT_c at～110K and Tonset at～120K favorably close to that of the high-T_c phase ofBi(Pb)SrCaCuO system the so called 2223 phase.It is also observed that the c-axis wasincreased from 3.06nm to 3.08nm and T_c was increased as the ignition time waslengthened.

Key words: superconductor, bismuth lead antimony strontium calcium copper oxide