Structural and magneto-electrical properties of bi(2-x)sm(x)sr(2)cacu(2)o(8+delta)high t(c)superconductor prepared by pechini method

Polycrystalline superconducting samples of Bi(2-x)Sm(x)Sr(2)CaCu(2)O(8+delta)were synthesized using Pechini method with different doping Sm concentrations (x = 0.0, 0.05, and 0.10) and investigated. FTIR spectroscopy showed that our final samples are totally free of organic elements. Le Bail refinement revealed that they were crystallized in the Bi-2212 phase. A small amount of the omnipresent Bi-2201 phase appeared as an impurity phase in all samples, whereas a small amount of Bi-2223 appeared only in the case ofx = 0.5. In one hand, the Sm doping decreases the cell parameters, and in other hand, it leads to a transformation into a pseudo-tetragonal structure in the case ofx = 0.10.The modulation was found to be incommensurate and increases with Sm content. The magneto-electrical resistivity curves show a transition to the superconductor state. The critical temperature T(C)decreases with the Sm doping, whereas the activation energy U(0)increased from 53.4 meV to 68.9 meV.