Influence of different solid state routes on superconducting of Tl?Ba?CaCu?O? superconductors adding with nano Ag

The thallium-based cuprate superconductors Tl?Ba?CaCu?O?, (Tl 2212) with nano Ag addition have been synthesized via the solid state reaction method. The Tl2Ba2CaCu2O8-(Ag)x have been prepared using two different methods A and B. In method A, nano Ag was added into prereacted Tl2212 powders. In method B, nano Ag was added in to unreacted Tl?Ba?CaCu?O?. The four point probe method, X-ray powder diffraction and scanning electron microscopy (SEM) have been employed to study the materials. Resistance data for both method showed little effect on Tc onset and Tczero . Tl?Ba?CaCu?O?-(Ag)x using both methods A and B with x = 0-5 wt% showed Tc onset of 112-107 K and Tc zero of 100-96 K. The effect of using various methods on critical current densities was studied. By using method A, it was found that the sample with x = 1 wt% showed maximum critical current density, Jc (at 77 K) of 16.47 mA/cm2. Therefore, by using method B, sample with x = 3 wt% showed the maximum critical current density, Jc (at 77 K) of 1505 mA/cm2. Thus, it can be concluded that the different methods of preparation influence the superconducting properties of the samples. The possible reasons for the changes in superconductivity properties of the system studied will be discuss in this paper