Abstract
We have prepared Tl2-xCrx)Ba2CaCu2O8-δ (Tl-2212) for x = 0.0-0.4 by standard solid state reaction with carbonate precursor and Cr2O3 as a source of Cr. The role of Cr substitute the Tl-sites in Tl-2212 superconductor system has been studied. The dc electrical resistance was determined using four point probe and the phase occurrence was studied by X-ray diffraction method. The transition temperature showed metallic normal state behavior for all samples. It was found that the addition of 0.2% mole Cr enhanced the Tc zero for 3.22%, whereas Tconset was enhanced up to 10.47%. The effectiveness substitution of Tl-sites by Cr was achieved in the series of x < 0.2%. Most of the samples were in 14/mmm space group.
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