Grain boundaries and pinning in bulk MgB2

Pavlo Mikheenko, E Martinez, Alexander Bevan, John Abell, JL MacManus-Driscoll

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83 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)S264-S270
JournalSuperconductor Science & Technology
Volume20
Issue number9
Early online date23 Aug 2007
DOIs
Publication statusPublished - 1 Sep 2007

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