Browsing by Author "Hamel, M."

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    Effect of Al Substitution on Structural and Electrical Properties of Bi1.6Pb0.4Sr2CaCu2−xMxO8+δ Superconducting Ceramics
    (Springer, 2012) Bouaïcha, F.; Mosbah, M.-F.; Hamel, M.; Benmaamar, F.
    In 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.