Conference paper
Improved High Temperature Superconductor Materials for Wind Turbine Generators
Department of Physics, Technical University of Denmark1
Quantum Physics and Information Technology, Department of Physics, Technical University of Denmark2
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Risø National Laboratory for Sustainable Energy, Technical University of Denmark5
Effects of yttria addition on the structural and electrical properties of the YBCO thin films are studied. The films were deposited on (LaAlO3).3-(Sr2AlTaO8).7 substrates by pulsed laser ablation from targets with different elemental composition. The contents of elements in the film depend mainly on the yttrium content in the target.
An increase of yttrium content leads to formation of a porous film with significant improvement of current-carrying capabilities (critical current density reaches 35 kA/cm2 at 77 K, 5 T, and exceeds 2 MA/cm2 at 50 K, 5 T). The Y-enriched YBCO film remains c-oriented up to 600 nm thickness with no suppression of the critical current density in the film.
Yttria decoration of the substrate surface prior to deposition resulted in formation of YBCO films with low strain and high crystal perfection. In contrast to the Y-enriched YBCO films, the films on yttria layers are dense. At temperatures of 77 K and above the YBCO films on yttria-decorated substrates exhibit critical current densities comparable to or better than that of the Y-enriched films.
Language: | English |
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Publisher: | Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi |
Year: | 2011 |
Pages: | 238-247 |
Proceedings: | Risø International Energy Conference 2011 |
Series: | Denmark. Forskningscenter Risoe. Risoe-r |
Journal subtitle: | Proceedings |
ISBN: | 8755039030 and 9788755039032 |
ISSN: | 13992236 and 01062840 |
Types: | Conference paper |
ORCIDs: | Grivel, Jean-Claude and Hansen, Jørn Bindslev |