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)
aSuperconductor 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
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.
Received: 02 July 2008
Revised: 07 November 2008
Accepted manuscript online:
Fund: 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).
Cite this article:
Ding Fa-Zhu(丁发柱), ü Xu-Dong(吕旭东), Gu Hong-Wei(古宏伟), Li Tao(李弢), and Cao Jiang-Li(曹江利) Study on reaction mechanism of YBa2Cu3O7-x film by TFA-MOD process 2009 Chin. Phys. B 18 1631
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
