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http://bura.brunel.ac.uk/handle/2438/9009
Title: | Synthesis of YBa2Cu3O(7-δ) and Y2BaCuO5 nanocrystalline powders for YBCO superconductors using carbon nanotube templates |
Authors: | Shi, Y Hasan, T Babu, NH Torrisi, F Milana, S Ferrari, AC Cardwell, DA |
Keywords: | Superconductivity;Flux pinning;Nanotubes;Trapped field |
Issue Date: | 2012 |
Publisher: | ACS Publications |
Citation: | ACS Nano, 6(6), 5395 - 5403, 2012 |
Abstract: | We fabricate nanosized superconducting YBa(2)Cu(3)O(7-δ) (Y-123) and nonsuperconducting Y(2)BaCuO(5) (Y-211) powders using carbon nanotubes as template. The mean particle size of Y-123 and Y-211 is 12 and 30 nm, respectively. The superconducting transition temperature of the Y-123 nanopowder is 90.9 K, similar to that of commercial, micrometer-scale powders fabricated by conventional processing. The elimination of carbon and the formation of a high purity superconducting phase both on the micro- and macroscale is confirmed by Raman spectroscopy and X-ray diffraction. We also demonstrate improvement in the superconducting properties of YBCO single grain bulk samples fabricated using the nanosize Y-211 powder, both in terms of trapped field and critical current density. The former reaches 553 mT at 77 K, with a ∼20% improvement compared to samples fabricated from commercial powders. Thus, our processing method is an effective source of pinning centers in single grain superconductors. |
Description: | This is the author's accepted manuscript. The final published article is available from the link below. Copyright © 2012 American Chemical Society. |
URI: | http://pubs.acs.org/doi/abs/10.1021/nn301262t http://bura.brunel.ac.uk/handle/2438/9009 |
DOI: | http://dx.doi.org/10.1021/nn301262t |
ISSN: | 1936-086X |
Appears in Collections: | Mechanical and Aerospace Engineering Dept of Mechanical and Aerospace Engineering Research Papers |
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