Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7210629 | Rare Metal Materials and Engineering | 2016 | 5 Pages |
Abstract
YBa2Cu3O7-x (YBCO) films were prepared on single-crystal LaAlO3 (100) substrate using a low-fluorine sol-gel method. The effect of the oxygen content in the atmospheres of heat treatment at 725 °C on the critical current density (Jc) of the obtained YBCO films was investigated. Results show that all the films heat-treated in the oxygen content range of 100â¼1700 µL/L exhibit good biaxial-texture characteristics. However, high-Jc YBCO films are not obtained at the oxygen contents of 100 and 200 µL/L due to the lower density of the surfaces. With increasing the oxygen content, the film surface becomes dense gradually. When the oxygen content is 300 µL/L, the surface of the film is very dense and Jc reaches 4.3 MA/cm2. Furthermore, many copper-rich second phases grow up on the surfaces with further increasing oxygen content up to 800 and 1700 µL/L, which is a dominant reason for the decline in Jc of the films.
Related Topics
Physical Sciences and Engineering
Engineering
Mechanics of Materials
Authors
Wu Chuanbao, Zhao Gaoyang, Fang Po, Lei Li, Li Chengshan,