Fabrication and properties of (Hg0.8Re0.2)Ba2Ca2Cu3Ox superconducting thick films

Approximately 50 µm thick epitaxial c-axis orientated (Hg0.8Re0.2)Ba2Ca2Cu3Ox superconducting films have been prepared on MgO(100) substrates using a spraying process and post-Hg-vapour annealing. The effects of the heating temperature–time combinations and the filling factor of Hg (ffHg) on the physical, electrical and magnetic properties of the thick films have been investigated. The interesting observation was the formation of a thick interfacial layer between the film and the substrates. This interfacial layer was found to be protective against excessive diffusion and dissolution of the Mg2+ ions from the substrate or counter-diffusion of Ba, Ca and Cu ions from the films. The XRD investigations showed that the a–b plane of the HgRe-1223 phase aligns parallel to the substrate surface. The best Tc and Tzero were found to be 131.9 and 129.3 K, respectively. Magnetic properties up to 5 T have been investigated. The calculated value of critical current density, Jc, was found to be 4.82 × 105 A cm−2 at 4.5 K. The results obtained suggested that fabrication of HgRe-1223 thick film superconductors using a spraying process with 130 K transition is possible and they are very promising particularly for electronic applications.

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