Effects of Fullerene Addition on Pinning Properties and Microstructures in Melt-Textured Y-Ba-Cu-O Superconductors
| Autor: | Masato Murakami, Muralidhar Miryala, Kazuo Inoue, Mikihito Tanichi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Superconductivity
Flux pinning Fullerene Materials science Condensed matter physics Carbon nanotube Yttrium barium copper oxide Condensed Matter Physics Microstructure 01 natural sciences Electronic Optical and Magnetic Materials law.invention Magnetic field chemistry.chemical_compound chemistry law Condensed Matter::Superconductivity 0103 physical sciences Electrical and Electronic Engineering 010306 general physics Nanodiamond |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 29:1-5 |
| ISSN: | 2378-7074 1051-8223 |
| Popis: | Bulk Y-Ba-Cu-O superconductors have significant potential for engineering applications due to high critical current density ( J c) and high trapped magnetic fields, which is attributed to the presence of pinning centers such as micro-sized Y2BaCuO5 (Y211) inclusions. The introduction of nanosized particles is known to function as more effective pinning centers than micro-sized ones. It has been reported that J c values were enhanced with the addition of nanosized particles such as ZrO2 and Y2Ba4CuMOy (M = Nb, Zr, etc.) in the YBa2Cu3O x (Y123) matrix. We have focused on nanocarbon as another candidate of the pinning center and reported that the addition of carbon nanotube (CNT) and nanodiamond led to the enhancement of J c in Y-Ba-Cu-O superconductors. Fullerene (C60) is also expected to improve the flux pinning performance. We then fabricated melt-processed Y-Ba-Cu-O bulk samples with the addition of fullerene and investigated the pinning properties and microstructures. SEM observation showed that nanosized particles were distributed in the Y123 matrix. J c exhibited the highest values for the sample with 1.0 wt% fullerene addition. These results suggest that fullerenes act as effective pinning centers. |
| Databáze: | OpenAIRE |
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