TY - JOUR
T1 - In situ observation of the formation of FeSe
AU - Grivel, Jean-Claude
AU - Wulff, Anders Christian
AU - Yue, Zhao
AU - Andersen, Niels Hessel
AU - Bednarcik, J.
AU - von Zimmermann, M.
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
KW - Superconducting materials
KW - Superledende materialer
U2 - 10.1088/0953-2048/24/1/015007
DO - 10.1088/0953-2048/24/1/015007
M3 - Journal article
VL - 24
SP - 015007
JO - Superconductor Science & Technology
JF - Superconductor Science & Technology
SN - 0953-2048
IS - 1
ER -