Study on reaction mechanism of YBa2Cu3O7-x film by TFA-MOD process |
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Authors: | Ding Fa-Zhu Lü Xu-Dong Gu Hong-Wei Li Tao Cao Jiang-Li |
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Institution: | School of Materials Science and Engineering, University
of Science and Technology Beijing, Beijing 100083, China; Superconductor Research Center, General Research
Institute for Non-ferrous
Metals, Beijing 100088, China |
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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. |
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Keywords: | TFA-MOD YBCO intermediate
phase water vapour pressure |
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