NTHESIS, CHARACTERIZATION AND STUDY THE EFFECT OF Te ON CRITICAL TEMPERATURE OF Tl -Re BASED CUPRATES
Journal Title: International Journal of Scientific Research and Management - Year 2014, Vol 2, Issue 5
Abstract
n 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- Ca - Cu -O precursors were made by taking BaCO 3 , CaCO 3 and CuO in the ratio of 2:2:3. The Tl -Re based cuprate with the formal composition Tl 1.88 Re 0.12 Ba 2 Ca 2 Cu 3 O 10+δ was formed by adding stoichiometric amount of Tl 2 O 3 and Re 2 O 7 to the precursor and whole mixture was synthesized under closed condition at 950 o C. For Tellurium doping, Tl 2 O 3 , TeO 2 , and Re 2 O 7 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.
Authors and Affiliations
Profulla C Kalita
Keywords
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