Superconductivity properties and surface morphology of Bi-2223 compound doped with nano ago.

Superconducting properties as well as microstructural development of Bi1.7Pb0.3Sr2Ca2-xAgxCu3OY composite for (0≤x≤0.5) were studied. Powder pellets were fabricated using the solid state reaction method. Electrical properties of the samples were studied by the four point probe method. It was found that the doping of Ag up to 0.2 concentration enhances the superconducting transition temperature TC, the highest TC was exhibited at 126 K, while excessive concentration decreased it. The phase identification and structural characteristics of synthesized high-TC superconductors was investigated through X-ray diffractions. The results showed both (Bi, Pb)-2223 and -2212 phases coexist in the samples with orthorhombic crystal structure for all samples. Surface morphology was studied with scanning electron microscope SEM. [ABSTRACT FROM AUTHOR]