Abstract
In this paper we have reported investigations on the effect of simultaneous substitution of Bi and Tl at the Hg site in the oxygen deficient HgOδ layer of HgBa2Ca2Cu3O8+δ cuprate superconductor. Bulk polycrystalline samples have been prepared by the two-step solid state reaction process (precursor route). It has been observed that the as grown HgBi0.2−xTIxBa2Ca2Cu3O8+δ (withx = 0.00, 0.05, 0.10, 0.15, 0.20) corresponds to the 1223 phase. It has been found that the Tc varies with the average cationic size < Rd > of the dopant cations. The optimumT c of ∼ 131 K has been found for the composition HgBi0.15TI0.05Ba2Ca2Cu3O8+δ This composition leads to the average dopant cation size of ∼1.108 å which is very close to the size of Hg2+ (∼ 111 å). The microstructure for HgBi0.15TI0.05Ba2Ca2Cu3O8+δ has been found to be most dense and this phase exhibits the highest stability. The Jc of the optimum material HgBi0.15TI0.05Ba2Ca2Cu3O8+δ is found to be ∼ 1.29 × 103 A/cm2 at 77 K.
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