CUED Publications database

Synthesis of YBa(2)Cu(3)O(7-δ) and Y(2)BaCuO(5) Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates.

Shi, Y and Hasan, T and Babu, NH and Torrisi, F and Milana, S and Ferrari, AC and Cardwell, DA (2012) Synthesis of YBa(2)Cu(3)O(7-δ) and Y(2)BaCuO(5) Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates. ACS Nano, 6. pp. 5395-5403.

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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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:42
Last Modified: 30 Jun 2014 09:47
DOI: 10.1021/nn301262t