Abstract
We have been studying REBa2Cu3Ox (RE: rare earth elements) coated conductors on clad-type substrates. We developed coated conductors on the 10mm wide clad-type tape, and succeeded in obtaining the maximum critical current of 380A/cm with the 2.0μm thick GdBa2Cu3Ox superconducting film. At present, we are trying to widen the tape width from 10mm to 30mm in order to increase production throughput. We report our recent progress on scaling-up of the buffer layers and their properties.The buffer layers consisted of three layers; CeO2 as the seed layer, yttrium-stabilized zirconia (YSZ) as the diffusion barrier layer and CeO2 as the lattice matching layer. They were grown by the RF-sputtering method and the electron beam evaporation technique (EB). EB deposition has possibility of higher throughput compared with the RF-sputtering. The intensity ratio of (200) to (200)+(111) for the lattice matching layer showed as high as 98%. The uniform properties of 40m long and 30mm wide substrates were successfully produced by all sputtering method. Additionally, the tape travel speed of the seed layer can be increased from 7m/h (RF-sputtering deposition) to 10m/h (EB deposition) on short sample (0.3m long).
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