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ince the discovery of the high temperature superconductivity in the Bi-Sr-Ca-Cu-O system , many investigations have focused on it to understand its properties and to improve them. Belonging to this system, the Bi2Sr2CaCu2O8+d (Bi-2212) phase has been widely studied in the recent years in order to understand, by various kinds of substitution, the relation between the structure and the superconductivity. Most of these substitutions have concerned the Cu site in the superconducting layer CuO2. Among these, as showed by G. Ilonca et al., the substitution by Fe kills the superconductivity at a lower concentration than Ni. At our knowledge, nothing has been made when there is in the same time a substitution by lead (Pb) on the Bi site. For that purpose samples of Bi1.6Pb0.4Sr2CaCu2−xFexO8+δ with x=0–0.06, have been prepared using the solid state reaction technique. The samples have been characterized by X-ray diffraction (XRD) and scanning electron microsopy (SEM). Structural analysis shows the influence of the Fe doping on the crystalline lattice structure of the samples

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Fe doping effect on structural properties of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mstyle mathvariant="normal"><mml:mi>Bi</mml:mi></mml:mstyle></mml:mrow><mml:mrow><mml:mn>1.6</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mstyle mathvariant="normal"><mml:mi>Pb</mml:mi></mml:mstyle></mml:mrow><mml:mrow><mml:mn>0.4</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mstyle mathvariant="…

Fe doping effect on structural properties of Bi1.6Pb0.4