High critical current YBCO thick films by TFA-MOD process

As a method of the fabrication processes of YBa2Cu3O7-x (YBCO), the metalorganic deposition (MOD) process using metal trifluoroacetete (TFA) is considered to be a strong candidate due to its low cost fabrication process for coated conductors with high J(c). In our previous work, a triple coated film with I pm in thickness was fabricated on a CeO2/IBAD-YSZ layer buffered Hastelloy substrate by optimizing the condition of heat treatments such as P-H2O in the multi-coating method [Physica C 378-381 (2002) 1013]. The J(c) value of 1.6 MA/cm(2) (77 K in self-field) in this film patterned 100 mum width and the I-c* value of 153 A/cm-width at 77 K in self-field were achieved. In order to obtain a thicker film with high overall I-c* for 1 cm width, the influence of the heat treatment conditions of P-H2O, P-O2, and the temperature in the MOD process was investigated. Subsequently, a 5 times coated film was obtained on a CeO2/IBAD-Zr2Gd2O7 layer buffered Hastelloy substrate by optimizing the conditions of heating and dip coating. As a result, the overall transport I-c value was improved to 210 A and J(c) value of 1.53 MA/cm(2) was obtained (77 K in self-field). (C) 2003 Elsevier B.V. All rights reserved.