Production of Bi-based high temperature vanadium doped superconductors at various rations, investigation of their structural and physical properties

In this study, glass-ceramic Bi2-xVxSr2Ca2Cu3O10+ ? (x= 0,1, 0,3 and 0,5) superconductors were prepared by using the melt-quenching method. The glass samples produced were treated by heat at 840 oC. These samples were characterized by thermal analysis (DSC-TGA), scanning electron microscopy (SEM), x-ray powder diffraction (XRD) techniques, and also by Hall effect measurements at different temperatures in the range 140-300 K under different applied magnetic fields, 0,2, 0,6, 1,0 and 1,4 T respectively. Two main phases (BSCCO 2212 and 2223) were observed in the x-ray data and the values of the lattice parameters were in quite agreement with the known values for 2212 and 2223 phases. Crystallization kinetics of the samples were investigated with the help of DSC technique. The kinetic parameters were also determined via non-isothermal JMAK method for different heating speed applied the samples. Besides, the activation energies for exothermic peaks were found as in the range of 357,202 - 390,66 kJ/mol, by using Kissinger method.