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

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

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

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Veröffentlicht in:IEEE transactions on magnetics 1996-09, Vol.32 (5), p.4863-4865
Hauptverfasser: Kim, Eng Chan, Yang, Jae Suk, Kang, Sin Giu, Lee, Dong Uk, Nam, Hyo Duk
Format: Artikel
Sprache:eng
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Zusammenfassung:Mossbauer spectroscopy and X-ray diffraction. The crystal structure is found to be a triclinic superstructure of the NiAs structure while Fe(7)Se(8) has a hexagonal structure. Changes of quadrupole shifts near 122 K for (Fe(1-x)Ni(x ))(7)Se(8) and 124 K for (Fe(1-x)Co(x))(7)Se(8) indicate that the spin-rotation transition proceeds abruptly, in contrast to the gradual transition reported for Fe(7)Se(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
ISSN:0018-9464
DOI:10.1109/20.539177