Title :
Surface-oxidation epitaxy of Ni-clad Ni-20wt%Cr and Ni-clad austenitic stainless steel tapes for Y-Ba-Cu-O coated conductors
Author :
Watanabe, Tomonori ; Matsumoto, Kaname ; Tanigawa, Toru ; Maeda, Toshihiko ; Hirabayashi, Izumi
Author_Institution :
Furukawa Electr. Co. Ltd., Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
We have prepared Ni-clad Ni-20wt%Cr (Ni/NiCr) and Ni-clad austenitic stainless steel (Ni/SS) tapes for YBa2Cu3 Ox (YBCO) coated conductors with higher strength and lower magnetism than those of pure nickel tape. Highly {100}<001> textured nickel outermost layers on those composite tapes were obtained by cold-rolling and subsequent heat treatment. The surfaces of Ni/NiCr composite tape and Ni/SS composite tape are favorable for epitaxial NiO growth by the surface-oxidation epitaxy (SOE) method. Highly {100}<001> textured NiO layers were formed on those textured composite tapes, as on cube-textured pure nickel tapes. Biaxially textured YBCO films were grown on SOE-NiO layers by the pulsed laser deposition (PLD) method. A thin MgO cap layer deposited on NiO layer improved the surface qualities of NiO, so that the YBCO films with a high critical current density (Jc) of 1.0×105 A/cm2 (77 K, 0 T) have been obtained on SOE-NiO with MgO cap layer on Ni/NiCr composite tape
Keywords :
barium compounds; cold rolling; epitaxial growth; heat treatment; high-temperature superconductors; nickel; nickel compounds; oxidation; pulsed laser deposition; substrates; superconducting thin films; surface texture; texture; yttrium compounds; MgO; MgO cap layer; Ni; Ni-Cr tapes; Ni-clad tapes; NiCr; NiO; NiO layers; PLD; YBa2Cu3O; YBa2Cu3Ox; austenitic stainless steel tapes; biaxially textured films; coated conductors; cold-rolling; composite tape; critical current density; heat treatment; highly {100}<001> textured layers; pulsed laser deposition; surface-oxidation epitaxy; tape magnetism; tape strength; Conductors; Critical current density; Epitaxial growth; Heat treatment; Nickel; Optical pulses; Pulsed laser deposition; Steel; Surface treatment; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
