Abstract
Thecost-effective and environment-friendly template of LaMnO3/epi-MgO/ion beam-assisted deposited (IBAD-)MgO/solution deposition planarized (SDP) Y2O3/Hastelloy tape was used as the substrate, on which the technique of metal organic chemical vapor deposition (MOCVD) has been applied to depositing 1.2- μm-thick YBa2Cu3O7−x (YBCO) films by modulating the substrate temperature ranging from 750 to 850 ∘C. The effects of substrate temperature on the preferential orientation, textures, surface morphology, and performance of the YBCO films were systematically investigated. X-ray diffraction and scanning electron microscope revealed that as substrate temperature increased from 750 to 810 ∘C, the orientation of YBCO films was transferred from the a-axis to the c-axis; meanwhile, the textures were improved and the films became denser. However, as the substrate temperature rose above 810 ∘C, the composition distributions and textures of YBCO films degraded quickly, and the films were barium-poor with CuYO2 impurity arising, of which all negatively affected the critical current density (J c) of YBCO films. Around 810 ∘C, the YBCO film was of the best crystallization and microstructure as well as highly epitaxial growth, leading to the highest J cof 1.8 MA/cm 2 at 77 K and self-field.
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Acknowledgments
We gratefully acknowledge the support of the National Science Foundation of China under Grant No. 91421110, National Basic Research Program (973) of China through Grant No. 2015CB358600, Sichuan Youth Science and Technology Innovation Research Team Funding (No.2011JTD0006), and the Fundamental Research Funds for the Central Universities (No.ZYGX2011Z002) for this work.
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Zhang, F., Xiong, J., Zhao, R. et al. Temperature-Modulated Growth of MOCVD-Derived YBa2Cu3O7−x Films on IBAD-MgO Templates. J Supercond Nov Magn 28, 2697–2702 (2015). https://doi.org/10.1007/s10948-015-3101-y
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DOI: https://doi.org/10.1007/s10948-015-3101-y