Abstract
We report on the use of the multistep electrolytic process for the synthesis of high-Tc single-phase HgBa2Ca2Cu3O8+δ (Hg-1223) superconducting films. The process includes: (i) deposition of BaCaCu precursor alloy; (ii) oxidation of BaCaCu films; (iii) electrolytic intercalation of Hg in precursor Ba2Ca2Cu3Ox films; (iv) electrochemical oxidation and annealing of Hg-intercalated Ba2Ca2Cu3Ox films to convert into Hg-1223. Films were characterized by thermo-gravimetric analysis and differential thermal analysis, x-ray diffraction and scanning electron microscopy. The electrolytic intercalation of Hg in Ba2Ca2Cu3Ox precursor proves to be a novel alternative to the high-temperature–high-pressure mercuration process. The films are single-phase Hg-1223 with Tc = 121.5 K and Jc = 4.3 × 104 A cm−2 at 77 K.
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