Cation ordering in NiFe2-x Crx O4-spinels studied by Mössbauer spectroscopy in external fields

NiFe2–x Crx O4, 0 ≤ x ≤ 1.8, produced from appropriate oxides, has been studied using Mössbauer spectroscopy (MS) at low and ambient temperatures and in external fields up to 7 Tesla. X‐ray diffraction (XRD) shows all samples to be single phase cubic spinels, where a0 changes with change in x, as a...

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Bibliographic Details
Published in:Physica Status Solidi (b) 2008-08, Vol.245 (8), p.1635-1640
Main Authors: Winell, S., Amcoff, Ö., Ericsson, T.
Format: Article
Language:English
Subjects:
61.05.cp
76.80.+y
Online Access:Get full text
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Summary:NiFe2–x Crx O4, 0 ≤ x ≤ 1.8, produced from appropriate oxides, has been studied using Mössbauer spectroscopy (MS) at low and ambient temperatures and in external fields up to 7 Tesla. X‐ray diffraction (XRD) shows all samples to be single phase cubic spinels, where a0 changes with change in x, as a concave curve, with a minimum at around x = 1. Analyses, based on Mössbauer spectra, show NiFe2–x Crx O4 to be a nearly perfect inverted spinel for x ≤ 0.6. However, for higher x ‐values the ordering is more complicated. It is shown that iron also populates the octahedral positions for x ≥ 0.8. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200743507