The effect of Sb superconducting materials with nominal composition Bi1.6Pb0.4-xSbxSr2Ca2Cu3Oy (x=0.01-0.14) and Bi1.5Pb0.5-xSbxSr2Ca2Cu3Oy (x=0.025-0.12) has been investigated. These materials were subjected to DTA, ICP emission spectrometry, SEM, XRD and electric resistance measurements. It was found that the introduction of Sb raises the melting temperature of the material, it also raises Tc (up to 110K) at several defined stoichiometric ratios. A certain lack of correspondence between the 2223 phase volume and the Tc value was noticed and a possible explanation has been proposed. © 1990 Springer-Verlag.