A simple, low-cost, and easily scalable method, thermal spray followed by post-spray annealing, has been successfully demonstrated for fabricating high-J c epitaxial superconducting films of Tl 0.5 Pb 0.5 Sr 1.6 Ba 0.4 Ca 2 Cu 3 O 9 [(Tl,Pb)-1223]. The process was performed by spraying a stoichiometric solution containing Tl, Pb, Sr, Ba, Ca, and Cu nitrates onto LaAlO 3 substrates heated to 300-400 °C. Subsequently, the amorphous films were placed inside a silver containment along with two-semicircular unfired pellets, and were reacted and crystallized by a thermal anneal at 870 o C in air. X-ray diffraction showed that the films consist mainly of c-axis aligned (Tl,Pb)-1223 phase with a small amount of (Tl,Pb)-1212 phase. X-ray ϕ-scans revealed very good epitaxial growth. Four-probe transport measurements on a 4 mm wide and 1.2 µm thick film showed a superconducting transition temperature of 106-109K, with a zero-field critical current of 51 A at 77K, which corresponds to a critical current density of 1.1×10 6 A/cm 2 .
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