Abstract
Quantitative phase analyses have been performed on Fe-sheathed exsitu MgB2 tapes after the deformation process and after annealing at 700, 850 and920 °C in vacuum. The techniques used were x-ray diffraction, differential thermalanalysis and scanning electron microscopy. All superconducting cores were foundto contain certain amounts of MgO, the largest amounts being observed nearthe sheath, and after annealing at the highest temperature. Small amounts ofMgB4 were detected in the inner part of the core, presumably formed by the decomposition ofMgB2. Atthe MgB2/Fe interface, a reaction layer was observed, which was identified as the borideFe2B. In addition,tapes annealed at 700 °C revealed the presence of the metastable phaseFe23B6. The interactionof the MgB2 filament with the Fe sheath and the presence of trapped oxygen limit the possibilities of thecurrent tape fabrication techniques.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
