Microstructure and superconducting properties of hot isostatically pressed MgB2

Abstract

Bulk samples of MgB2 have been formed by hot isostatic pressing (HIPping) of commercial powder at 100MPa and 950=B0C. The resulting material is 100% dense with a sharp superconducting transition at 37.5K. Microstructural studies have indicated the presence of small amounts of second phases within the material, namely MgO and B rich compositions, probably MgB4. Magnetisation measurements performed at 20K have revealed values of Jc=1.3 x 106A/cm2 at zero field, and 9.3 x 105A/cm2 at 1T. Magneto optical (MO) studies have shown direct evidence for the superconducting homogeneity and strong intergranular current flow in the material.

3 pages, 6 figures, text updated, new references included and discussed. Submitted to Superconductor Science and Technology

References in corpus (3)

• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering
• Effect of sintering temperature under high pressure in the uperconductivity for MgB2

Cited by in corpus (6)

• The influence of microstructures and crystalline defects on the superconductivity of MgB2
• Enhanced critical current density of MgB2 superconductor synthesized in high magnetic fields
• Superconductivity in porous MgB2
• Synthesis and Characterization of Excess Magnesium MgB2 Superconductor under Inert Carbon Environment
• Elastic properties of hot isostatically pressed magnesium diboride
• The influence of structural defects on intra-granular critical currents of bulk MgB2