Effect of Li2O on the microstructure, magnetic and transport properties of Tl-2223 superconductor

Abstract

The present study gives an account of the effect of Li 2 O on the ease of phase formation and superconducting properties of Tl 2 Ba 2 Ca 2 Cu 3 O 10+δ (Tl-2223) material. Li substitution only slightly decreases the superconducting transition temperature, while the optimal concentration of 20% doping improves the critical current density (J c ) by ~ two fold. We found substantial effects on the synthesis temperature, microstructure and normal state transport properties of Tl-2223 with Li 2 O addition. Short-time thermal annealing under flowing Ar+4%H 2 (1 hr.) further improves the superconducting volume fractions, as well as J c .

Effect of Pressure on the Superconducting Properties of Tl2Ba2Ca2Cu3O9-δ

“…Crystalline samples were synthesized from a precursor having a composition equivalent to Ba 2 Ca 2 Cu 3 O 7 , and then, an appropriate molar amount of Tl 2 O 3 was added to complete the formation of the desired compound. (See [8] for more details on the synthesis). Our sample measured 2.67 ± 0.05 mm by 1.28 ± 0.05 mm and was 1.04 ± 0.05 mm thick.…”