Effect of humidity on microstructure and properties of YBCO film prepared by TFA-MOD method
来源期刊:Journal of Rare Earths2009年第3期
论文作者:王连红 李弢 古宏伟
文章页码:486 - 489
摘 要:Epitaxial YBCO superconducting films were deposited on the single crystal LaAlO3(001) substrate by metal organic deposition method. All YBCO films were fired at 820 °C in humidity range of 2.6%-19.7% atmosphere. Microstructure of YBCO thin films was analyzed by means of X-ray diffraction(XRD) and scanning electron microscopy(SEM) . Superconducting properties of YBCO films were measured by four-probe method. XRD results showed that the second phase(such as BaF2) and a-axis-oriented grains existed in the films prepared at 2.6% humidity condition;a-axis-oriented grains increased in the film prepared at higher than 4.2% humidity condition;almost pure c-axias-oriented grains existed in the films fired at 4.2% humidity condition. Morphologies of the YBCO films showed that all films had a smooth and crack-free surface. YBCO film prepared at 4.2% humidity condition showed Jc value of 3.3 MA/cm2 at 77 K in self-field.
王连红1,2,李弢2,古宏伟2
1. The Key Laboratory of High Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences2. Superconducting Materials Research Center,General Research Institute for Non-ferrous Metals
摘 要:Epitaxial YBCO superconducting films were deposited on the single crystal LaAlO3(001) substrate by metal organic deposition method. All YBCO films were fired at 820 °C in humidity range of 2.6%-19.7% atmosphere. Microstructure of YBCO thin films was analyzed by means of X-ray diffraction(XRD) and scanning electron microscopy(SEM) . Superconducting properties of YBCO films were measured by four-probe method. XRD results showed that the second phase(such as BaF2) and a-axis-oriented grains existed in the films prepared at 2.6% humidity condition;a-axis-oriented grains increased in the film prepared at higher than 4.2% humidity condition;almost pure c-axias-oriented grains existed in the films fired at 4.2% humidity condition. Morphologies of the YBCO films showed that all films had a smooth and crack-free surface. YBCO film prepared at 4.2% humidity condition showed Jc value of 3.3 MA/cm2 at 77 K in self-field.
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