Improved Hc2 in Bulk-Form Magnesium Diboride by Mechanical Alloying With Carbon

Abstract

High energy milling of MgB2 pre-reacted powder renders the material largely amorphous through extreme mechanical deformation and is suitable for mechanically alloying MgB2 with dopants including carbon. Bulk samples of milled C and MgB2 powders subjected to hot isostatic pressing and Mg vapor annealing have achieved critical fields in excess of 32T and critical current density approaching 10^6 A/cm^2.

13 pages, 3 figures references updated, typos corrected, numerical error corrected

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• Superconductivity of bulk MgB2 + nano(n)-SiC composite system: A high field magnetization study
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• Effect of oxygen incorporation on normal and superconducting properties of MgB2 films
• Development of Doped MgB2 Wires and Tapes for Practical Applications
• Measurement of the magnetic penetration depth of a superconducting MgB${}_2$ thin film with a large intraband diffusivity
• Reaction method control of impurity scattering in C-doped MgB2, proving the role of defects besides C substitution level
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• Carrier Transport in Magnesium Diboride: Role of Nano-inclusions
• Strong enhancement of critical current density in MgB2 superconductor using carbohydrate doping
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