Effect of the Buffered-template on the Property of YBCO Superconducting Film Deposited by MOCVD Method

[YBa2Cu3O7-x] thin films were deposited on various buffered-templates by a metal organic chemical vapor deposition(MOCVD). Three different templates of CeO2/YSZ/CeO2/pure-Ni (CYC), CeO2/YSZ/Y2O3/Ni-3at.%W (YYC) and CeO2/IBAD-YSZ/stainless steel were used. The Ni and Ni-W alloy tapes were biaxially textured by cold rolling and annealing heat treatment. The dense YBCO films were grown on both the IBAD and YYC templates with no microcrack, while the YBCO films on the CYC templates were grown with the formation of microcracks and NiO. The YBCO film on the YYC template showed the higher Ic than that on CYC template. Especially, the IBAD templates with a thin CeO2 (type I) and thick CeO2 (type II) top layer were used to compare the deposition nature of the YBCO on them. Comparing the current property of the YBCO films on IBAD templates, the YBCO film deposited on thick CeO2layer was better than the film on thin CeO2 layer.