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EPR and magnetic susceptibility studies of xCr2O3-(1-x) 3B2O3-PbO glasses

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Abstract

By using X-ray diffraction analysis, EPR and magnetic measurements, the chromium-ion distribution in xCr2O3-(1−x) [3B2O3-PbO] glasses with 0⩽x⩽35 mol% Cr2O3 was studied. EPR investigation evidenced the presence of both Cr3+ and Cr5+ ions, the latter being in small proportion, in agreement with the atomic magnetic moment values. For concentrations x⩽20 mol% Cr2O3 the isolated Cr3+ ions coexist with those coupled by super-exchange magnetic interactions, the isolated ones prevailing only for x<3 mol% Cr2O3. For x>20 mol % Cr2O3 microcrystalline precipitates were detected, giving rise to an antiferromagnetic transition with Néel temperature, N N≃310 K and paramagnetic Curie temperature, θ p=−480 K.

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Authors and Affiliations

  1. Faculty of Physics, University of Cluj-Napoca, Romania

    I. Ardelean, Gh. Ilonca, M. Peteanu & E. Barbos

  2. Institute of Isotope and Molecular Technologies, Cluj-Napoca, Romania

    E. Indrea

Authors
  1. I. Ardelean
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  2. Gh. Ilonca
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  3. M. Peteanu
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  4. E. Barbos
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  5. E. Indrea
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Ardelean, I., Ilonca, G., Peteanu, M. et al. EPR and magnetic susceptibility studies of xCr2O3-(1-x) 3B2O3-PbO glasses. J Mater Sci 17, 1988–1996 (1982). https://doi.org/10.1007/BF00540415

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  • DOI: https://doi.org/10.1007/BF00540415

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