Microstructure, texture and critical current of Ag-sheathed 2223 multifilament tapes

Y.L. Liu, W.G. Wang, H.F. Poulsen, P. Vase

    Research output: Contribution to journalJournal articleResearch

    Abstract

    An Ag-sheathed 2223 multifilament tape was produced by the powder-in-tube method. The various parts of the tape were heat treated at different temperatures under reduced oxygen partial pressure. The microstructure and the texture were characterized by synchrotron x-ray diffraction and SEM and correlated with J(c). In the low temperature range (<826 degrees C), the 2223 fraction and the c-axis alignment of 2223 grains increased with increasing temperature. A significant increase of J(c) (from 1 to 41 kA cm(-2)) was observed in this range, indicating that the phase purity and the texture were the major controlling factors, In the medium temperature range (826-830 degrees C), the 2223 fraction and the grain alignment tend to saturate, and J(c) remains nearly constant at a level of 40 kA cm(-2). In the high temperature range (830-836 degrees C), the 2223 fraction and the grain alignment remained unchanged but J(c) decreased with increasing temperature. The drop in J(c) was related to the presence of an amorphous phase and a small amount of 2201 phase, indicating that the grain connectivity has become the major current-limiting factor. The variations in the filament shape, density and alignment within the multifilament tape were characterized. The influence of the inhomogeneous structure on J(c) is discussed.
    Original languageEnglish
    JournalSuperconductor Science & Technology
    Volume12
    Issue number6
    Pages (from-to)376-381
    ISSN0953-2048
    DOIs
    Publication statusPublished - 1999

    Fingerprint Dive into the research topics of 'Microstructure, texture and critical current of Ag-sheathed 2223 multifilament tapes'. Together they form a unique fingerprint.

    Cite this