In situ observation of the formation of FeSe

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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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
Publication date2011
Volume24
Journal number1
Pages015007
ISSN0953-2048
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 9

Keywords

  • Superconducting materials
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