Grain boundaries and pinning in bulk MgB2
| Autor: | Judith L. MacManus-Driscoll, Elena Martínez, A.I. Bevan, J.S. Abell, Pavlo Mikheenko |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Zener pinning Condensed matter physics Metals and Alloys Condensed Matter Physics Grain size law.invention Grain growth Optical microscope law Condensed Matter::Superconductivity Materials Chemistry Ceramics and Composites Grain boundary diffusion coefficient Grain boundary Electrical and Electronic Engineering Electron backscatter diffraction Grain boundary strengthening |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1361-6668 0953-2048 |
| Popis: | 7 pages, 7 figures, 1 table.-- et al. We report the grain size dependence of critical current and grain boundary pinning in bulk MgB2. By combining polarized optical microscopy and electron backscatter diffraction, we obtain evidence of special grain boundaries with a high density of dislocations that are able to provide high critical current in MgB2 polycrystals. We argue that reduction of grain size to the nanoscale level is sufficient to provide the critical current densities required for large-scale applications at the boiling temperature of liquid hydrogen. The research was sponsored by the European Commission within the Sixth Framework Programme HIPERMAG, EPSRC of the UK, and The Marie Curie Excellence Grant, NanoFen, contract EXT-014156. |
| Databáze: | OpenAIRE |
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