Structural and magnetic properties of MnO-B2O3-SrO glasses

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The Mn2+ ion distribution in different structural units in 2B2O3·SrO glasses was revealed by means of electron paramagnetic resonance measurements. Octahedral symmetric sites, tetragonally distorted, were detected and also the progressive clustering of Mn2+ ions above a certain impurity level (x ≥ 10 mol % MnO). Magnetic measurements revealed that both Mn2+ and Mn3+ ionic species are simultaneously present in the matrix and that a transition from magnetically isolated ions to antiferromagnetically coupled pairs occurs on increasing the manganese content over 10 mol % MnO.

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