Fabrication of Long Lengths of Epitaxial Buffer Layers on Biaxially Textured Nickel Substrates Using a Continuous Reel-to-Reel Dip-Coating Unit |
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Authors: | M. Parans Paranthaman Thomas G. Chirayil Fred A. List Xingtian Cui Amit Goyal Dominic F. Lee Eliot D. Specht Patrick M. Martin Robert K. Williams Donald M. Kroeger Jonathan S. Morrell David B. Beach Ron Feenstra David K. Christen |
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Affiliation: | Chemical and Analytical Sciences Division, Oak Ridge National Lab, Oak Ridge, TN.;Metals &Ceramics Division, Oak Ridge National Lab, Oak Ridge, TN.;Solid State Division, Oak Ridge National Lab, Oak Ridge, TN. |
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Abstract: | A low-cost, nonvacuum, solution precursor route has been developed to produce epitaxial oxide buffer layers of Eu2O3 or La2Zr2O7 on biaxially textured Ni (100) tapes. A reel-to-reel continuous dip-coating unit consisting of a constant-tension tape transport system attached to a controlled atmosphere furnace was fabricated. Nickel tapes were pulled through a 2-methoxyethanol solution of europium methoxyethoxide/acetate or lanthanum zirconium methoxyethoxide. The double-sided dip-coated tapes were then annealed in a preheated furnace at 1000°–1100°C with a high flow rate of Ar/H2 (4%) gas. The dip-coated buffers were dense, continuous, crack-free, and epitaxial with a single cube texture. A critical current ( J c) of >1 MA/cm2 at 77 K and self-field was obtained for YBa2Cu3O7-δ (YBCO) films with a layer sequence of YBCO ( ex situ BaF2 process)/CeO2 (sputtered)/YSZ (sputtered)/Eu2O3 (dip-coated)/nickel. We have produced 1–2 m lengths of epitaxial buffer layers on textured nickel substrates using a nonvacuum process for the first time. |
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Keywords: | coatings nickel/nickel compounds substrates |
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