Improving the Characteristics of Powder-In-Tube MgB_2 Superconductor Fabricated Using the Extrusion Technique

摘要

High-density cylindrical MgB_2 superconductors were manufactured using an ex situ powder in tube extrusion technique. The superconducting properties of the steel-sheathed MgB_2 samples were examined with respect to their magnetisation responses, critical temperature and current density. The critical current density of the superconductor was determined by means of magnetisation measurements using Bean's critical state model. J_c reached a maximum of 4 × 10~5 A/cm~2 at 5 K.