Magnetic dipolar and electric quadrupolar effects on the Mössbauer spectra of magnetite above the Verwey transition View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1977-09

AUTHORS

L. Häggström, H. Annersten, T. Ericsson, R. Wäppling, W. Karner, S. Bjarman

ABSTRACT

Mössbauer spectroscopic studies (57Fe) of powdered magnetite have been undertaken between 120 K and 880 K. Below the magnetic transition temperature (TC=839.5 K) three six-line patterns have been fitted to our experimental spectra. The broadening of the B-pattern is explained by two magnetically non-equivalent B-site irons, suggesting broadening due to electron hopping to be negligible. In the paramagnetic state the electric quadrupole splittings of iron at A-and B-sites are found to be constant, independent of temperature, having the values zero and 0.16 mm/s, respectively. The centroid shifts, on the other hand, show above 700 K large deviations from the calculated second order Doppler shift. It is proposed that the deviations arise from a variation in band overlap. The temperature variation of the magnetic fields is found to be proportional to the sublattice magnetization. The difference in the magnetic fields at the two non-equivalent B-sites is measured to be 1.1 T at 310 K. More... »

PAGES

201-214

Journal

TITLE

Hyperfine Interactions

ISSUE

1

VOLUME

5

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01021693

DOI

http://dx.doi.org/10.1007/bf01021693

DIMENSIONS

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