Study of Ag and Cu / MgB2 powder-in-tube composite wires fabricated by in-situ reaction at low temperature
arXiv:cond-mat/0203464 · doi:10.1088/0953-2048/15/7/309
Abstract
Superconducting Ag or Cu sheathed MgB2 wires have been fabricated by conventional powder-in-tube techniques. The in-situ reaction of Mg and B powders with atomic proportions of 1:2 and 1.33:2 inside Ag or Cu tubes at low temperatures have been searched. An active alloying of Mg with Ag or Cu sheaths at temperatures below 660 C has been observed. For Ag sheaths, there is a strong diffusion of Mg, which does not allow the formation of large amounts of MgB2 at the core. For Cu sheaths, the diffusion of Mg is stopped by the formation of a MgCu2 layer around the superconducting core and an appropriated excess of Mg leads to superconducting cores with Tc=39 K and good Jc values, thus being possible the development of Cu/MgB2 composite wires.
10 pages, 5 figures. Submitted to Supercond. Sci. Technol
References in corpus (13)
- Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
- Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering
- Large transport critical currents in unsintered MgB2 superconducting tapes
- Large transport critical currents in dense Fe- and Ni-clad MgB2 superconducting tapes
- 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
- Very fast formation of superconducting MgB2/Fe wires with high Jc
- Substitution effect of Zn and Cu in MgB2 on Tc and structure
- Low Temperature Fabrication of MgB2
- Strain Effect in MgB2/Stainless Steel Superconducting Tape
- Influence of the starting composition on the structural and superconducting properties of MgB2 phase
- Transport Current in MgB2 based Superconducting Strand at 4.2 K and Self-Field
Cited by in corpus (4)
- Properties of superconducting MgB_2 wires: "in-situ" versus "ex-situ" reaction technique
- A sol-gel method for growing superconducting MgB2 films
- MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical-chemical vapor deposition
- Supercurrents in Magnesium Diboride/Metal Composite Wire