Effect of recurrent annealing on Structure and Electrical Properties of High Temperature Tl1.7Ag0.3Sr2Ca2Cu3O10+δ Superconductor

Abstract

Bulk samples of high temperature superconductivity Tl1.7Ag0.3Sr2Ca2Cu3O10+δ have been prepared by a two- step solid state reaction process at annealing temperature 850 ºC & pressure at 8ton/cm2 .The study showed that the Oxygen rate (δ) plays a major role to increase (Tc) , the best rate of Oxygen in the prepared compounds was (10.27( .The influence of annealing time have been investigated to obtain the optimum conditions for the formation and stabilization of the high-Tc phase (Tl-2223). The result have shown that the optimum annealing time was 140h , The x-ray data of all superconductor samples showed a tetragonal structure .The micro structure of the superconductor have been investigated using Scanning Electron Microscope (SEM) ,to determine the elements ratios in the compounds and the range of the annealing influence .