Abstract
The present study gives an account of the effect of Li2O on the ease of phase formation and superconducting properties of Tl2Ba2Ca2Cu3O10+x (Tl-2223) material. Li substitution only slightly decreases the superconducting transition temperature, while the optimal concentration of 20% doping improves the critical current density (Jc) by ~ two fold. We found substantial effects on the synthesis temperature, microstructure and normal state transport properties of Tl-2223 with Li2O addition. Short-time thermal annealing under flowing Ar+4%H2 (1 hr.) further improves the superconducting volume fractions, as well as Jc.
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