Bouaïcha, F.Mosbah, M.-F.Hamel, M.Benmaamar, F.2022-04-272022-04-272012http://hdl.handle.net/123456789/13000In this work we study the effect on structural and electrical properties of superconducting compound Bi1.6Pb0.4Sr2CaCu2−yMyO8+δ were M = Al (with y = 0–0.6). The samples were prepared by the solid-state reaction method. The samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), direct current (DC) resistivity versus temperature ρ(T ) and alternative current (AC) susceptibility measurements. Structural analysis shows that the crystalline lattice structure of the prepared sample belongs, mainly, to the superconduc- tive tetragonal phase Bi(Pb)2212. The SEM micrographs show that in the undoped sample the grain size has a random distribution with few grains greater than 5 μm. The grains are very dense and well connected. A quite different microstructure is obtained for the doped samples of which grains are more connected with a flat characteristic shape of Bi(Pb)2212 superconductors. All samples exhibit a superconducting character and Tc and the superconducting volume fraction decrease with increasing rate of aluminum.enSuperconductivityBi–Pb–Sr–Ca–Cu–O systemSubstitutionNormal stateArticle