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Samples of nominal composition Bi,_._,Pb,Sb,Sr,Ca,Cu,O (x = 0 -0.8, y = 0 -0.3) were prepared and investigated by x-ray, DTA, TG and microprobe analyses. T, was measured by resistive and magnetic (DC susceptibility) methods. The addition of antimony exerted a stabilizing influence on the formation of the 2223 phase, the solubility of Sb being 60.1 mole. The optimal temperatures of t h e formation of the 2223 phases with dinerent Pb a n d S b content are in the range 83W4O"C. Deviation from the optimal temperature of about 1-2°C can b e the cause of a sharp decrease in the volume of the 2223 phase. The anomalies at 240 K revealed a temperature dependence of resistance and magnetic susceptibility for some samoles with and without Sb