MOCVD and Spray Pyrolysis for Coated Conductor Synthesis
| Autor: | Carmen Jiménez, P. Odier, François Weiss, L. Vergnieres, C.E. Bruzek, J.M. Saugrain, S. Donet |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
High-temperature superconductivity Analytical chemistry Chemical vapor deposition Yttrium barium copper oxide Condensed Matter Physics Epitaxy Electronic Optical and Magnetic Materials law.invention Full width at half maximum chemistry.chemical_compound chemistry law Physical vapor deposition Metalorganic vapour phase epitaxy Electrical and Electronic Engineering Ion beam-assisted deposition |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 15:2759-2762 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/tasc.2005.847772 |
| Popis: | A reel-to-reel MOCVD system has been optimized to get high quality YBCO coated conductor tapes. The buffer layer architectures, the superconducting film as well as the silver shunt layer were deposited in this reactor. Reported stacking are YSZ/CeO/sub 2//YBCO and CeO/sub 2//YBCO, respectively, on Ni/CeO/sub 2/ alloys (5%W) and on SS/YSZ (IBAD) tapes. Epitaxial growth was depicted with a strong in-plane and out-of-plane texture: FWHM of YBCO phi-scans were 6.6/spl deg/ on Ni tapes and 8.3/spl deg/ on IBAD hastelloy ones. High performance was obtained with Jc values reaching 0.6 MA/cm/sup 2/ at 77 K (sf) on Ni tape and larger than 1.3 MA/cm/sup 2/ on IBAD substrates. Critical currents over 80 A/cm were attained on samples prepared with a tape velocity set at 4.6 m/h. Beside MOCVD, spray pyrolysis has been developed as an alternative method to decrease significantly the equipment and the production costs. This technique works at atmospheric pressure and uses an aqueous solution of nitrates as precursors. First transport measurements gave Ic values close to 20 A/cm (77 K, sf) on single crystals. Textured YBCO was also deposited on metallic tapes. |
| Databáze: | OpenAIRE |
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