Magnetic dipolar and electric quadrupolar effects on the Mössbauer spectra of magnetite above the Verwey transition
Clicks: 238
ID: 117925
1970
Mössbauer spectroscopic studies (57Fe) of powdered magnetite have been undertaken between 120 K and 880 K. Below the magnetic transition temperature (T C=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.
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häggström1970hyperfinemagnetic
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| Authors | L. Häggström;H. Annersten;T. Ericsson;R. Wäppling;W. Karner;S. Bjarman;L. Häggström;H. Annersten;T. Ericsson;R. Wäppling;W. Karner;S. Bjarman; |
| Journal | hyperfine interactions |
| Year | 1970 |
| DOI | doi:10.1007/BF01021693 |
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