@article{3013722,
    title = "Magnetic and epr studies of α-, β-, and γ-fe2wo6 phases at low temperatures",
    author = "Guskos, N. and Sadlowski, L. and Typek, J. and Likodimos, V. and Gamari-Seale, H. and Bojanowski, B. and Wabia, M. and Walczak, J. and Rychlowska-Himmel, I.",
    journal = "Journal of Solid State Chemistry",
    year = "1995",
    volume = "120",
    number = "2",
    pages = "216-222",
    issn = "0022-4596, 1095-726X",
    doi = "10.1006/jssc.1995.1401",
    abstract = "The polymorphic modifications α-, β-, and γ-Fe2WO6 of the iron tungstate system were studied by means of magnetic susceptibility and EPR measurements at low temperatures. Both methods revealed a significant paramagnetic contribution, probably resulting from local distortions of the antiferromagnetic bulk structure induced by a disturbed cation ordering or the presence of Fe2+ ions. The magnetic susceptibility revealed a peak at ∼260 K for all samples which can be related with an AF phase transition. The EPR spectra comprised the contribution of various isolated paramagnetic iron centers, one arising from high-spin Fe3+ ions in rhombic crystal field symmetry with E/D ≈ 1/3 and D ≈ 0.22 cm-1, an anisotropic EPR signal consistent with an S = 3/2 ground state with large zero-field splitting, and a dominant component in the g ≈ 2 region presumably arising from an S = 1/2; spin state. The latter spectra were tentatively attributed to the formation of multi-iron clusters, one of them invoking the presence of Fe2+ ions as well. For the βFe2WO6 phase an additional EPR spectrum was observed, which probably results from high-spin Fe3+ ions in a weak crystal field. © 1995 Academic Press. All rights reserved."
}