EPR and magnetic susceptibility studies of xCr2O3-(1-x) 3B2O3-PbO glasses |
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Authors: | I Ardelean Gh Ilonca M Peteanu E Barbos E Indrea |
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Affiliation: | (1) Faculty of Physics, University of Cluj-Napoca, Romania;(2) Institute of Isotope and Molecular Technologies, Cluj-Napoca, Romania |
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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,
p=–480 K. |
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