Chinese Physics Letters · 2001 · 26 citations · 2 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsAlloysGrain Structure AnalysisMetalsMicrostructure AnalysisStacking FaultsSuperconducting MaterialsCritical Current DensityCurrent DensityGrain BoundariesHigh-temperature SuperconductorsMicrostructureSuperconducting NanostructuresSuperconducting Properties
The structural features of MgB2 superconductors prepared under different conditions have been analysed by means of transmission electron microscopy. The MgB2 crystal is identified to have a hexagonal structure with the space group of P6/mmm. Superconducting materials synthesized under a high pressure of 6 Gpa are made of regularly stacked grains as large as a few microns in sizes. Stacking faults and microstructure properties of grain boundaries, either with or without impurities, appearing in a sample with the critical current density greater than 105A/cm2, have been systematically investigated.
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Superconductivity at 39 K in magnesium diboride
Jun Nagamatsu, Norimasa Nakagawa, Takahiro Muranaka et al. · Nature · 2001 · 6.4K citations