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

TL;DR

This paper demonstrates that mechanical alloying of MgB2 with carbon via high energy milling and subsequent processing significantly enhances the superconductor's critical magnetic field and current density.

Contribution

It introduces a novel mechanical alloying method with carbon to improve MgB2's superconducting properties in bulk form.

Findings

Critical fields exceeding 32T achieved.

Critical current density approaching 10^6 A/cm^2.

Effective enhancement of superconducting properties through mechanical alloying.

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.