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Englishe fabricate nanosized superconducting YBa 2Cu 3O 7-δ (Y-123) and nonsuperconducting Y 2BaCuO 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.
| Titolo: | Synthesis of YBa2Cu3O7-δ and Y2BaCuO5 nano-crystalline powders using carbon nanotube templates for YBCO superconductors |
| Autori interni: | |
| Data di pubblicazione: | 2012 |
| Rivista: | |
| Abstract: | e fabricate nanosized superconducting YBa 2Cu 3O 7-δ (Y-123) and nonsuperconducting Y 2BaCuO 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. |
| Handle: | http://hdl.handle.net/20.500.11769/373355 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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