Cation ordering in NiFe2-xCrxO4-spinels studied by Mössbauer spectroscopy in external fields
2008 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 245, no 8, 1635-1640 p.Article in journal (Refereed) Published
NiFe2-xCrxO4, 0 < ;= x < ;= 1.8, produced from appropriate oxides, has been studied using Mossbauer 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 a(0) change in x, as a concave curve, with a minimum at around x=1. Analyses, based on Mossbauer spectra, show NiFe2-xCrxO4 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.
Place, publisher, year, edition, pages
2008. Vol. 245, no 8, 1635-1640 p.
61.05.cp • 76.80.+y
IdentifiersURN: urn:nbn:se:uu:diva-103313DOI: 10.1002/pssb.200743507ISI: 000258414500025OAI: oai:DiVA.org:uu-103313DiVA: diva2:218033