中国物理B ›› 2009, Vol. 18 ›› Issue (4): 1631-1636.doi: 10.1088/1674-1056/18/4/058
曹江利1, 丁发柱2, 吕旭东2, 古宏伟2, 李弢2
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)
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.
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