Rectangular (1 cm ×12 cm) YBCO films prepared by MOD using spin-coating and wire-bar coating

Abstract

1 cm ×12 cm rectangular YBCO films for fault current limiter devices were prepared by MOD. Usually, solution coating in MOD is carried out by spin coating. However, there are some problems associated with spin coating of large-size rectangular substrates. Namely, the maximum substrate dimension is limited by cup size and motor torque of the apparatus. It was found that wire-bar coating is a promising alternative; this method is more easily scaled up to a large size at lower cost. By both methods, YBCO films with high J c's around 2 MA/cm2 were obtained on CeO 2-buffered sapphire. So far, the uniformity of Jc in the YBCO films prepared by spin coating was better than those by wire-bar coating. © 2006 IOP Publishing Ltd.