Natural and artificial low angle grain boundaries with high current-carrying capabilities
| Autor: | A. Leenders, F. Garcia Moreno, Herbert C. Freyhardt, H. Walter, B. Bringmann, Ch. Jooss, M. P. Delamare |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
High-temperature superconductivity
Materials science 02 engineering and technology engineering.material 01 natural sciences Pulsed laser deposition law.invention chemistry.chemical_compound Complex geometry Coating law 0103 physical sciences Electrical and Electronic Engineering Monolith Composite material 010306 general physics Superconductivity geography geography.geographical_feature_category Yttrium barium copper oxide 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry engineering Grain boundary 0210 nano-technology |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 11:3788-3791 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/77.919889 |
| Popis: | For several years, the technical applications of bulk HTS YBCO superconductors are of growing interest. However, for applications which require a complex geometry of the monoliths, the Multi-Seeding Melt Growth (MSMG) and the mechanical joining of two single-domain tiles becomes necessary. However, these two techniques lead to the formation of a low-angle grain boundary (GB). The influence of the seed distance (d/sub s/) on the properties of the GB has been studied in order to obtain a precipitate free grain-boundary. On the top surface of one monolith, two distances between two seeds were chosen, i.e. 4 mm and 11 mm. Regarding d/sub s//spl sim/11 mm, some rich-copper phases and large pores can be observed throughout the GB. In contrast, for d/sub s//spl sim/4 mm, neither residual copper-rich phases nor pores are observed within the GB. Magneto-optical measurements performed on the sample with d/sub s//spl sim/4 mm, revealed that the critical current density through the GB is influenced by the growth directions. Regarding the mechanical joining, a high connectivity between two adjacent domains can be obtained by using the PLD technique for coating of the monoliths. |
| Databáze: | OpenAIRE |
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