Development of All-CSD Processes for Coated Conductors at Nexans: Limitations and Possible Solutions
| Autor: | M.O. Rikel, M. Klein, S Mahachi, J Schutz, J. Ehrenberg, Joachim Bock, B Hoppe |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
High-temperature superconductivity Yttrium barium copper oxide Condensed Matter Physics Epitaxy Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound chemistry law Percolation Grain boundary Texture (crystalline) Electrical and Electronic Engineering Composite material Electrical conductor Layer (electronics) |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 21:2928-2932 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/tasc.2010.2079911 |
| Popis: | Nexans experience in developing all CSD processes for coated conductors with the YBCO/CGO/LZO/Ni-5% W RABITS architecture is summarized. The chosen CC architecture has a principal disadvantage that the next layer only clones, but more often deteriorates the out-of-plane texture of the previous layer (in average by ~ 20% for LZO). Depending on the quality of RABITS, this may increase the amount of grain boundaries (GBs) not transparent for the supercurrent close to the percolation limit for the current-breaking path, which explains low and poorly reproducible Jc. Modifying the buffer architecture by introducing CGO seed layer suppresses deterioration of the out-of-plane texture. Another approach, extending the range of acceptable grain misorientations by selective doping YBCO GBs with Ca is shown not possible using the current MOD-TFA process because of decomposition of initial Y123 to disordered Y124 and Y247 during pyrolysis of the second MOD layer. Possible ways of further development are discussed. |
| Databáze: | OpenAIRE |
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