Hot isostatic pressing of powder in tube MgB2 wires

Abstract

The critical current density (Jc) of hot isostatic pressed (HIPed) MgB2 wires, measured by d.c. transport and magnetization, is compared with that of similar wires annealed at ambient pressure. The HIPed wires have a higher Jc than the annealed wires, especially at high temperatures and magnetic fields, and higher irreversibility field (Hirr). The HIPed wires are promising for applications, with Jc>106 A/cm2 at 5 K and zero field and >104 A/cm2 at 1.5 T and 26.5 K, and Hirr ~ 17 T at 4 K. The improvement is attributed to a high density of structural defects, which are the likely source of vortex pinning. These defects, observed by transmission electron microscopy, include small angle twisting, tilting, and bending boundaries, resulting in the formation of sub-grains within MgB2 crystallites.

13 pages,3 figures

References in corpus (6)

• Large transport critical currents in dense Fe- and Ni-clad MgB2 superconducting tapes
• High transport critical current density above 30 K in pure Fe-clad MgB2 tape
• High performance new MgB2 superconducting hollow wires
• The influence of microstructures and crystalline defects on the superconductivity of MgB2
• Microstructure and high critical current of powder in tube MgB2
• Improved superconducting properties of MgB2

Cited by in corpus (15)

• Significantly enhanced critical current densities in MgB2 tapes made by a scaleable, nano-carbon addition route
• Improved Hc2 in Bulk-Form Magnesium Diboride by Mechanical Alloying With Carbon
• Strong enhancement of Jc in binary and alloyed in-situ MgB2 wires by a new approach: Cold high pressure densification
• Large field generation with Hot Isostatically Pressed Powder-in-Tube MgB2 coil at 25 K
• Strong influence of precursor powder on the critical current density of Fe-sheathed MgB2 tapes
• Transport Properties and Exponential n-values of Fe/MgB2 Tapes With Various MgB2 Particle Sizes
• Enhanced critical current density of MgB2 superconductor synthesized in high magnetic fields
• Defect structures in MgB2 wires introduced by hot isostatic pressing
• Large irreversibility field in nanoscale C-doped MgB2/Fe tape conductors
• Strongly Enhanced Current-Carrying Performance in MgB2 Tape Conductors by Novel C60 Doping
• Synthesis of Mg(B${}_{1-x}$C${}_x$)${}_2$ Powders
• A sol-gel method for growing superconducting MgB2 films
• Elastic properties of hot isostatically pressed magnesium diboride
• Probe to properties of MgB2 thick film on silicon carbide substrate
• Strong enhancement of critical current density in MgB2 superconductor using carbohydrate doping