Journal article
In situ observation of the formation of FeSe
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
German Electron Synchrotron4
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.
| Language: | English |
|---|---|
| Year: | 2011 |
| Pages: | 015007 (4pp) |
| ISSN: | 13616668 and 09532048 |
| Types: | Journal article |
| DOI: | 10.1088/0953-2048/24/1/015007 |
| ORCIDs: | Grivel, Jean-Claude and Wulff, Anders Christian |
