Development of High-Performance QMG Bulk Magnets for High Magnetic Field Engineering Applications
| Autor: | Hidekazu Teshima, Mitsuru Morita, Shinya Nariki |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Flywheel energy storage Superconductivity Materials science Condensed matter physics Magnetic energy Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Ion Magnetic field Paramagnetism Magnet Phase (matter) 0103 physical sciences Electrical and Electronic Engineering 010306 general physics |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 26:1-4 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/tasc.2016.2537382 |
| Popis: | This paper describes the recent progress in QMG bulks in Nippon Steel and Sumitomo Metal Corporation. QMG is a high-Jc bulk material, which consists of a single crystalline RE123 phase with finely dispersed RE211 particles. QMG bulks have a significant potential for high-field engineering applications, since they can trap high magnetic fields depending on their J c and size. Gd-QMG bulks are very attractive for various bulk applications such as flywheel energy storage systems, ship motors, wind power generators, etc. The trapped magnetic field of Gd-QMG bulks 60 mm in diameter at 77 K is twice as large as that of Y-QMG bulks with a similar size due to their excellent J c properties. An enlargement in the diameter of the bulk leads to the enhancement of the trapped magnetic field. The large Gd-based QMG bulks up to 150 mm in diameter were fabricated by incorporating the RE compositional gradient method. Compact nuclear magnetic resonance (NMR)/MRI spectrometers are one of the promising applications of bulk superconductors. Eu-QMG bulks are suitable for NMR magnets. NMR applications require extremely homogenous magnetic fields. In the Eu-system, the small paramagnetic moment of the Eu ion compared to the Gd ion improves the field homogeneity in the bulk. |
| Databáze: | OpenAIRE |
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