2Cu3O7-x (YBCO) films were prepared on LaAlO3 (100) substrate using a low-fluorine sol-gel method. The effect of the oxygen content during firing YBCO films at 725 °C on the critical current density (Jc) of the resulting YBCO films were investigated. It is found that all the YBCO films fired in the oxygen content scale of 100~1700 ppm exhibit good biaxial-texture characteristics. However, the YBCO film is less dense when the oxygen content is low and thus the critical current density (Jc) of the film is inferior. The film surface becomes denser with increasing the oxygen content during the firing process, and Jc of the film reaches 4.3 MA/cm2 when the oxygen content is elevated to 300 ppm. Furthermore, many copper-rich second phases appear on the films surfaces and become more gradually with the further elevating the oxygen content, resulting in the decline of Jc."/>

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Preparation of YBa2Cu3O7-x Films at the Firing Temperature of 725 °C by a Low-Fluorine Sol-Gel Method
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Xi'an University of Technology,,,,

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The Project of Introducing Talents of Discipline to Universities (“111” Project, B08040); The International Cooperation Fund of the State Key Laboratory of Solidification Processing in NWPU

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    Abstract:

    In this paper, the YBa2Cu3O7-x (YBCO) films were prepared on LaAlO3 (100) substrate using a low-fluorine sol-gel method. The effect of the oxygen content during firing YBCO films at 725 °C on the critical current density (Jc) of the resulting YBCO films were investigated. It is found that all the YBCO films fired in the oxygen content scale of 100~1700 ppm exhibit good biaxial-texture characteristics. However, the YBCO film is less dense when the oxygen content is low and thus the critical current density (Jc) of the film is inferior. The film surface becomes denser with increasing the oxygen content during the firing process, and Jc of the film reaches 4.3 MA/cm2 when the oxygen content is elevated to 300 ppm. Furthermore, many copper-rich second phases appear on the films surfaces and become more gradually with the further elevating the oxygen content, resulting in the decline of Jc.

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[Wu Chuanbao, Zhao Gaoyang ,Fang Po, Lei Li, Li Chengshan. Preparation of YBa2Cu3O7-x Films at the Firing Temperature of 725 °C by a Low-Fluorine Sol-Gel Method[J]. Rare Metal Materials and Engineering,2016,45(10):2534~2538.]
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History
  • Received:August 07,2015
  • Revised:January 14,2016
  • Adopted:February 24,2016
  • Online: November 10,2016
  • Published: