A reel to reel MOCVD process for coated conductors

A MOCVD process for continuous deposition of YBCO and oxide buffer layers on long metal tapes was developed. Textured Ni alloyed tapes were coated with oxide buffer layers at low oxygen partial pressure without oxidation of the metal tape. 350-1000 nm thick YBCO films were deposited at a tape velocity of 4 m/h. MOCVD buffer layers and additional samples, which were delivered from partners of the Virtual Institute, were used. The YBCO films on chemically coated buffer layers exhibit 0.3-7 MA/cm2 at 77 K. On PVD coated buffer layers the critical current density was 1-2 MA/cm2. The excellent in plane texture (FWHM=5-6 ) and out of plane texture (FWHM=1.4-3 ) of the YBCO films on chemically coated buffer layers may enable to increase further the critical current density. (orig.)