中国物理B ›› 2009, Vol. 18 ›› Issue (4): 1631-1636.doi: 10.1088/1674-1056/18/4/058

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Study on reaction mechanism of YBa2Cu3O7-x film by TFA-MOD process

曹江利1, 丁发柱2, 吕旭东2, 古宏伟2, 李弢2   

  1. (1)School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; (2)Superconductor Research Center, General Research Institute for Non-ferrous Metals, Beijing 100088, China
  • 收稿日期:2008-07-02 修回日期:2008-11-07 出版日期:2009-04-20 发布日期:2009-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 50672011) and the Hi-Tech Research and Development Program of China (Grant No 2007AA03Z216).

Study on reaction mechanism of YBa2Cu3O7-x film by TFA-MOD process

Ding Fa-Zhu(丁发柱)a)†, ü Xu-Dong(吕旭东)a), Gu Hong-Wei(古宏伟)a)‡, Li Tao(李弢)a), and Cao Jiang-Li(曹江利)b)   

  1. a Superconductor Research Center, General Research Institute for Non-ferrous Metals, Beijing 100088, China; b School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2008-07-02 Revised:2008-11-07 Online:2009-04-20 Published:2009-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 50672011) and the Hi-Tech Research and Development Program of China (Grant No 2007AA03Z216).

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摘要： This paper systematically investigates the intermediate phases of YBa2Cu3O7-x (YBCO) film prepared by metalorganic deposition method using trifluoroacetates (TFA-MOD). According to x-ray diffraction and Raman analyses, the precursor film decomposed in a mixture of BaF2, Y2O3 and CuO after the pyrolysis process. Then these intermediate phases converted into tetragonal YBa2Cu3O6.5 at about 725 °C. The influence of water vapour pressure on the YBa2Cu3O7-x film growth on LaAlO3 single-crystal substrates was also studied. The films prepared at low water vapour pressures (40--140 hPa) showed poor electrical performance due to the a-axis grain structure and impurity phases. However, the films prepared at 190 hPa exhibited the highest critical temperature of 90 K and the highest Jc of 3.8 MA/cm2, which was attributed to the formation of a purer YBCO phase and stronger biaxial texture.

关键词: TFA-MOD, YBCO, intermediate phase, water vapour pressure

Abstract: This paper systematically investigates the intermediate phases of YBa2Cu3O7-x (YBCO) film prepared by metalorganic deposition method using trifluoroacetates (TFA-MOD). According to x-ray diffraction and Raman analyses, the precursor film decomposed in a mixture of BaF2, Y2O3 and CuO after the pyrolysis process. Then these intermediate phases converted into tetragonal YBa2Cu3O6.5 at about 725 °C. The influence of water vapour pressure on the YBa2Cu3O7-x film growth on LaAlO3 single-crystal substrates was also studied. The films prepared at low water vapour pressures (40--140 hPa) showed poor electrical performance due to the a-axis grain structure and impurity phases. However, the films prepared at 190 hPa exhibited the highest critical temperature of 90 K and the highest Jc of 3.8 MA/cm2, which was attributed to the formation of a purer YBCO phase and stronger biaxial texture.

Key words: TFA-MOD, YBCO, intermediate phase, water vapour pressure

中图分类号: 

  • 74.72.Bk
68.55.A- (Nucleation and growth) 68.55.-a (Thin film structure and morphology) 61.05.cp (X-ray diffraction) 78.30.Hv (Other nonmetallic inorganics)