Long length oxide template for YBCO coated conductor prepared by surface-oxidation epitaxy method

A 50 m long, biaxially textured NiO buffer layer for epitaxial growth of YBa2Cu3O7-delta (YBCO) film has been fabricated on the long cube textured nickel tape using surface-oxidation epitaxy (SOE) method. The SOE-NiO layers were highly {100} (001) textured. The full width at half maximum of 10-14.5 degrees from X-ray phi -scan (Ao) was in the range of 10-14.5 degrees through the whole length. The critical current density (Jj values exceeding 0.3 MA/cm(2) (77 K, 0 T) have been obtained in short samples of YBCO films on NiO/Ni tapes, by using thin MgO cap layer. Thirty meters Iong Ni-clad Ni-20wt.%Cr (Ni/NiCr) and Ni-clad austenitic stainless steel (Ni/SS) tapes were also prepared for YBCO coated conductors with higher strength and lower magnetism than those of pure nickel tape. Highly {100} (001) textured NiO layers were formed on those textured composite tapes by SOE method as same as on cube textured pure nickel tapes. YBCO films with J(c) of 0.1 MA/cm(2) (77 K, 0 T) have been obtained on MgO/SOE-NiO layer of short Ni/NiCr composite tape. (C) 2001 Elsevier Science B.V. All rights reserved.