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SYNTHESIS, CHARACTERIZATION AND STUDY THE EFFECT OF Te ON CRITICAL TEMPERATURE OF Tl-Re BASED CUPRATES.

In the present work, we presented the synthesis, characterization and study the effect of Te on Critical Temperature Tl-Re based Cuprates: one was Re-doped and another one was simultaneously doped with Te and Re. All these materials were prepared by the usual solid-state reaction method. Ba-CaCu-O precursors were made by taking BaCO3, CaCO3 and CuO in the ratio of 2:2:3. The Tl-Re based cuprate with the formal composition Tl1.88 Re0.12Ba2Ca2Cu3O10+δ was formed by adding stoichiometric amount of Tl2O3 and Re2O7 to the precursor and whole mixture was synthesized under closed condition at 950 o C. For Tellurium doping, Tl2O3, TeO2, and Re2O7 were taken in the ratio of 1.85:0.03:0.12 and synthesized at the same condition .The samples are then palletized and annealed at oxygen environment. The Tellurium doping increased the critical temperature from 86K to 123K. X-ray diffraction reveals the presence of a number of more superconducting phases in Tl-Re-Te compounds. The gain homogeneity of the powered samples were excellent.