Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 644, Issue -, Pages 554-561Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.05.091
Keywords
Coated conductors; Buffer layer; Chemical solution deposition; Texture; Morphology
Categories
Funding
- International Science & Technology Cooperation Program of China [2012DFA50780]
- National Science Fund Program of China [51302225, 51202201]
- Innovative Research Team of Shaanxi province [2013KCT-07]
- International Science & Technology Cooperation Program
- Natural Science Fund Program of Shaanxi Province [2013KW12-03, 2014JQ6202]
- Weiyang District Science and Technology Plan Program of Xi'an city in Shaanxi Province [201412]
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Textured La2Zr2O7 (LZO) films have been fabricated onto textured metallic Ni-5 at.%W (Ni5W) tapes using a reel-to-reel chemical solution deposition (CSD) system. Subsequently, CeO2 cap and YBCO superconducting layers have successfully deposited on the LZO buffered substrates in sequence by CSD method, indicating good structural transition and smooth surface morphology of such the buffer layer. We have evaluated the effect of the travel speed of the tape during the annealing process of the LZO layer on the texture and superconducting performance of the final YBCO layers deposited on Ni5W/LZO/CeO2 substrates by all chemical method. The appearance of outgrown grains and pinholes on the surface of CeO2 layer results in the formation a-axis grains and impurity, which leads to the decrease of superconducting performance of YBCO layer. The high c-axis-oriented YBCO film grown on the LZO/CeO2 buffered Ni5W metallic tape exhibits a high critical current density J(C) of 2.1 MA/cm(2) at 77 K and 0 T when the preferred travel speed of tape of 4.2 m/h is adopted to fabricate the underlying LZO film. (C) 2015 Elsevier B.V. All rights reserved.
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