Effects of Cs substitution on physical properties of BSCCO superconductor

In this study, bulk and fiber superconductors of Bi2Sr2Ca1-xCsxCu2O8+δ (x= 0.0, 0.025, 0.05, 0.075, 0.10, 0.125, and 0.15) were produced by a solid-state and LFZ techniques. The variations of superconducting properties by Cs substituting for Ca in Bi-2212 superconductors have been studied via X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), DC magnetic measurements (M-H and M-T). The critical transition temperature, TC, values were not significantly changed by increasing Cs content and from M-T measurements it was found as around 80 K for all bulk samples and 90 K for all fiber samples. It is observed from the XRD patterns that the major phase is Bi-2212 for all samples. The magnetic hysteresis results indicate that by increasing Cs doping the loop widths decrease for bulk samples, but in fiber samples the widest hysteresis loop is x=0.05. Additionally, the critical current densities, Jc, of samples have been calculated by using the Bean's critical state model. Keywords: Ceramic Superconductors, Substitution, XRD, SEM, DC Magnetic Measurements, Critical Transation Temperature, Bean Model, Bi-2212