التفاصيل البيبلوغرافية
| العنوان: |
MOCVD and Spray Pyrolysis for Coated Conductor Synthesis. |
| المؤلفون: |
Vergnières, L., Donet, S., Jimenez, C., Odier, P., Weiss, F., Bruzek, C. E., Saugrain, J. M. |
| المصدر: |
IEEE Transactions on Applied Superconductivity; Jun2005 Part 3 of 3, Vol. 15 Issue 2, p2759-2762, 4p |
| مصطلحات موضوعية: |
COATING processes, ELECTRIC currents, SUPERCONDUCTIVITY, CHEMICAL reactions, CRYSTALS, CRYSTALLOGRAPHY |
| مستخلص: |
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/CeO2/YBCO and CeO2/YBCO, respectively, on Ni/CeO2 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° on Ni tapes and 8.3° on IBAD hastelloy ones. High performance was obtained with Jc values reaching 0.6 MA/cm at 77 K (sf) on Ni tape and larger than 1.3 MA/cm² 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, so on single crystals. Textured YBCO was also deposited on metallic tapes. [ABSTRACT FROM AUTHOR] |
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