Microstructure and high critical current of powder in tube MgB2
arXiv:cond-mat/0208293 · doi:10.1063/1.1561572
Abstract
We report dc transport and magnetization measurements of Jc in MgB2 wires fabricated by the powder-in-tube method, using commercial MgB2 powder with 5 %at Mg powder added as an additional source of magnesium, and stainless steel as sheath material. By appropriate heat treatments, we have been able to increase Jc by more than one order of magnitude from that of the as-drawn wire. We show that one beneficial effect of the annealing is the elimination of most of the micro-cracks, and we correlate the increase in Jc with the disappearance of the weak-link-type behavior.
12 pages, 3 figures, submitted to APL
References in corpus (9)
- Large transport critical currents in dense Fe- and Ni-clad MgB2 superconducting tapes
- Improved superconducting properties in nanocrystalline bulk MgB_2
- High transport critical current density obtained for Powder-In-Tube-processed MgB2 tapes and wires using stainless steel and Cu-Ni tubes
- High transport critical current density above 30 K in pure Fe-clad MgB2 tape
- High transport currents in mechanically reinforced MgB2 wires
- Effect of lattice strain and defects on the superconductivity of MgB2
- Very fast formation of superconducting MgB2/Fe wires with high Jc
- The influence of microstructures and crystalline defects on the superconductivity of MgB2
- Improved superconducting properties of MgB2
Cited by in corpus (6)
- Hot isostatic pressing of powder in tube MgB2 wires
- Large field generation with Hot Isostatically Pressed Powder-in-Tube MgB2 coil at 25 K
- Defect structures in MgB2 wires introduced by hot isostatic pressing
- Superconductivity in porous MgB2
- MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical-chemical vapor deposition
- Hollow carbon spheres as an efficient dopant for enhancing critical current density of MgB2 based tapes