Preparation of YBCO Superconducting Film by Chemical Solution Deposition Using a Novel Copper Precursor Derived from PEG_(200) and Sucrose

Preparation and characterization of the YBCO superconducting films by chemical solution route with polyethylene glycol (PEG200) and Cu(NO3)2 as precursors are presented. It was found that PEG200 and sucrose were novel chelates and Cu (NO3)2 was an alternative precursor for the preparation of YBCO superconducting film by chemical solution route. The precursor solution was prepared by mixing yttrium trifluoroacetate, barium trifluoroacetate, and copper nitrate in solvent of methanol with chelates including PEG200 and sucrose. YBCO films were prepared by coating the precursor solution on LaAlO3 single crystal substrate, following vacuum drying, rapid calcining, firing and oxygen annealing. The prepared films were characterized by optical microscope (OM), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that films were crack-free and homogeneous, stronger tendency of (00l) texture, uniform with less pore, pure c-axis orientation. The films showed good superconducting properties, with Tc of 90 K and critical current density (Jc) of 1 MA/cm2 (77 K, 0 T). This work demonstrates that the developed method is a promising method for preparation of YBCO superconducting film which has a fine superconducting characterization with advantages of simple and rapid.