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EPR Study of Defect Centers in New Mg2InV3O11 Vanadate

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Abstract.

A new multicomponent vanadate Mg2InV3O11 has been synthesized and investigated by electron paramagnetic resonance (EPR) technique. X-ray diffraction measurements have shown that Mg2InV3O11−δ is isostructural with the magnetic system M2FeV3O11 (M = Mg, Zn, Co, Ni). According to the nominal stoichiometry of the Mg2InV3O11 compound all ions are nonmagnetic, but the registered EPR spectra in the 4–300 K temperature range have revealed the presence of a rich variety of paramagnetic centers involving predominantly monomeric and dimeric V4+ ions and their complexes. The most intense EPR component attributed to VO2+ vanadyl ions in an axial symmetry displays the hyperfine structure and could be described by the following spin Hamiltonian parameters: g ∥ = 1.924(1), g ⊥ = 1.965(1) and A ∥ = 162(1)·10−4 cm−1, A ⊥ = 50.8(4) · 10−4 cm−1. The presence of a complicated spectrum at low magnetic fields (g ≅ 4) is the evidence of existence of vanadium dimers. The study of the temperature dependence of EPR parameters (g-factors, line widths, and integrated intensities) has allowed drawing conclusions on existing paramagnetic centers and their magnetic interactions. The role of oxygen deficiency in producing the magnetic centers has been discussed.

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Authors and Affiliations

  1. Institute of Physics, Szczecin University of Technology, Szczecin, Poland

    G. Zolnierkiewicz, J. Typek & N. Guskos

  2. Department of Physics, University of Athens, Athens, Greece

    N. Guskos

  3. Department of Inorganic and Analytical Chemistry, Szczecin University of Technology, Szczecin, Poland

    M. Bosacka

Authors
  1. G. Zolnierkiewicz
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  2. J. Typek
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  3. N. Guskos
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  4. M. Bosacka
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Authors' address: Grzegorz Zolnierkiewicz, Institute of Physics, Szczecin University of Technology, Al. Piastow 17, Szczecin 70-310, Poland

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Zolnierkiewicz, G., Typek, J., Guskos, N. et al. EPR Study of Defect Centers in New Mg2InV3O11 Vanadate. Appl Magn Reson 34, 101–109 (2008). https://doi.org/10.1007/s00723-008-0101-0

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  • DOI: https://doi.org/10.1007/s00723-008-0101-0

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