Abstract
Fe3O4 has been studied by using Mössbauer spectroscopy and X-ray diffraction. The crystal is found to have a cubic spinel structure with the lattice constant a 0 = 8.3970 ± 0.0005 °A. The temperature dependence of the magnetic hyperfine fields at 57Fe nuclei at the tetrahedral (A) and the octahedral (B) sites is analyzed by using the Néel theory of ferrimagnetism. The dominant superexchange interaction is found to be the antiferromagnetic intersublattice A − O − B superexchange interaction and its strength is J A−B = −23.4 k B . The intrasublattice A − O − A superexchange interaction is also antiferromagnetic with a strength of J A−A = −14.6 kB. The weakest superexchange interaction is the ferromagnetic B − O − B interaction: J B−B = 1.23 k B . The Debye temperatures of the tetrahedral and the octahedral sites are found to be Θ A = 351 ± 5 K and Θ B = 322 ± 5 K, respectively.
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Kim, S.J., Kim, C.S. & Hahn, E.J. Mössbauer studies on superexchange interactions in Fe3O4 . Journal of the Korean Physical Society 64, 852–856 (2014). https://doi.org/10.3938/jkps.64.852
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DOI: https://doi.org/10.3938/jkps.64.852