Mossbauer and X-ray study of (Fe/sub 1-x/Ni/sub x/)/sub 7/Se/sub 8/ and (Fe/sub 1-x/Co/sub x/)/sub 7/Se/sub 8

Mossbauer and X-ray study of (Fe/sub 1-x/Ni/sub x/)/sub 7/Se/sub 8/ and (Fe/sub 1-x/Co/sub x/)/sub 7/Se/sub 8

Mossbauer spectroscopy and X-ray diffraction. The crystal structure is found to be a triclinic superstructure of the NiAs structure while Fe/sub 7/Se/sub 8/ has a hexagonal structure. Changes of quadrupole shifts near 122 K for (Fe/sub 1-x/Ni/sub x/)/sub 7/Se/sub 8/ and 124 K for (Fe/sub 1-x/Co/sub...

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Veröffentlicht in:IEEE transactions on magnetics 1996-09, Vol.32 (5), p.4863-4865
Hauptverfasser: Eng Chan Kim, Jae Suk Yang, Sin Giu Kang, Dong Uk Lee, Hyo Duk Nam
Format: Artikel
Sprache:eng
Schlagworte:
Cobalt
Ferrimagnetic materials
Iron
Magnetic moments
Nickel
Physics
Silicon compounds
Spectroscopy
Temperature measurement
X-ray diffraction
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container_title IEEE transactions on magnetics
container_volume 32
creator Eng Chan Kim
Jae Suk Yang
Sin Giu Kang
Dong Uk Lee
Hyo Duk Nam
description Mossbauer spectroscopy and X-ray diffraction. The crystal structure is found to be a triclinic superstructure of the NiAs structure while Fe/sub 7/Se/sub 8/ has a hexagonal structure. Changes of quadrupole shifts near 122 K for (Fe/sub 1-x/Ni/sub x/)/sub 7/Se/sub 8/ and 124 K for (Fe/sub 1-x/Co/sub x/)/sub 7/Se/sub 8/ indicate that the spin-rotation transition proceeds abruptly, in contrast to the gradual transition reported for Fe/sub 7/Se/sub 8/ with a triclinic superstructure. Isomer shifts indicate a ferrous character for the iron ions at all four sites. The Neel temperature is found to decrease with increasing nickel and cobalt concentration.
doi_str_mv 10.1109/20.539177
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subjects Cobalt
Ferrimagnetic materials
Iron
Magnetic moments
Nickel
Physics
Silicon compounds
Spectroscopy
Temperature measurement
X-ray diffraction
title Mossbauer and X-ray study of (Fe/sub 1-x/Ni/sub x/)/sub 7/Se/sub 8/ and (Fe/sub 1-x/Co/sub x/)/sub 7/Se/sub 8
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