Title :
Reel to reel continuous formation of Y-123 coated conductors by IBAD and PLD method
Author :
Iijima, Yasuhiro ; Kakimoto, Kazuomi ; Kimura, Mariko ; Takeda, Kaoru ; Saitoh, Takashi
Author_Institution :
Fujikura Ltd., Tokyo, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
Continuous deposition of Y-123 tapes was performed by ion-beam-assisted deposition (IBAD) and pulsed laser deposition (PLD) method. YSZ template films were deposited by IBAD on Ni-based alloy tapes with tape shifting speeds of 0.1-0.3 m/h. They were uniformly coated with an in-plane mosaic spread of 12-13 degrees in 5 m length. In order to overcome the low deposition rate of the IBAD process, large area ion sources with inductively coupled discharge plasma were applied. Y-123 films were deposited by PLD on the YSZ templates with a tape shifting speed of 1.0 m/h. The degradation of Y-123 targets for the PLD process was effectively restricted by combined motion of rapid rotation and linear shifting. Ic of 84.0 A and Jc of 0.76MA/cm2 were obtained at 77 K, 0 T in the length of 1.0 m when the in-plane mosaic spread for the Y-123 film was 7 degrees. Ic of 35.0 A and Jc of 0.25MA/cm2 were obtained in a 4.6 m long sample at the length of 4.0 m, when the in-plane mosaic spread for the Y-123 film was 11 degrees
Keywords :
barium compounds; critical current density (superconductivity); high-temperature superconductors; ion beam assisted deposition; mosaic structure; pulsed laser deposition; superconducting thin films; yttrium compounds; 1 m; 4 m; 4.6 m; 5 m; 77 K; Ic; IBAD; Jc; Ni-based alloy tapes; PLD; Y-123 coated conductors; Y-123 tapes; Y2O3-ZrO2; YBa2Cu3O7; YSZ template films; deposition rate; in-plane mosaic spread; linear shifting; rapid rotation; reel to reel continuous formation; sample length; tape shifting speed; target degradation; Conducting materials; Conductors; Degradation; Grain boundaries; High temperature superconductors; Optical pulses; Pulsed laser deposition; Substrates; Superconducting epitaxial layers; Superconducting films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on