Abstract
An improvement of the transport critical current density,Jc,of MgB2 wires was obtained after the addition of 10 wt%B4C powders, afterreaction at 800 °C: Jc valuesof 1 × 104 A cm−2 at 4.2 K and 9 T were obtained for wires of 1.11 mm diameter in a Fematrix. The starting mixture of Mg and B was doped with submicrometricB4C, the ratio beingMg:B:B4C = 1:2:0.08, correspondingto 10 wt% B4C. For T>800 °C, adecrease of Jc was found, due to the reaction with the Fe sheath. In order to investigate theorigin of the improvement of the transport properties for heat treatments up to800 °C, x-ray diffraction measurements were performed. A decrease of the lattice constanta from 3.0854 to 3.0797 Å was found, thus suggesting an effect of the substitution of carbon on theproperties of the wires. A comparison with the literature data shows that the addition ofB4C powders leads to the second highest improvement ofJc reported so far after SiC, thus constituting an alternative for future applications.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.