In situ observation of the formation of FeSe

Jean-Claude Grivel, Anders Christian Wulff, Zhao Yue, Niels Hessel Andersen, J. Bednarcik, M. von Zimmermann

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The formation of the FeSe compound from a mixture of Fe and Se powders encased in a composite Cu/Nb sheath was studied in situ by means of high-energy synchrotron x-ray diffraction. Tetragonal beta-FeSe does not seem to form directly from the starting elements. Instead, a sequence of FeSe2, Fe3Se4 and Fe7Se8 phases formed prior to the main formation stage of beta-FeSe at 350-370 degrees C, although a small amount of this phase appears at 250 degrees C already during a heating ramp of 2 degrees C min(-1). beta-FeSe transforms to delta-FeSe around 480 degrees C and back to beta-FeSe at 405 degrees C during cooling. There is no evidence for any interface reaction between the metal sheath and the superconducting core.
    Original languageEnglish
    JournalSuperconductor Science & Technology
    Volume24
    Issue number1
    Pages (from-to)015007
    ISSN0953-2048
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Superconducting materials

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