EPR and magnetic susceptibility studies on MnO-B2O3-CdO glasses

Electron paramagnetic resonance (EPR) of Mn2+ ions revealed their distribut ion on different structural units of 2B(2)O(3). CdO glass matrix doped with MnO. Distorted octahedral symmetric sites were detected. The progressive c lustering of Mn2+ ions was evidenced when the MnO content increased. Magnet ic measurements revealed both Mn2+ and Mn3+ valence states as simultaneousl y present in the vitreous matrix and the transition from isolated ions in s amples with x less than or equal to 3 mol% MnO to those involved in dipole- dipole interactions for samples with x < 20 mol% and to antiferromagnetical ly coupled pairs when x greater than or equal to 20 mol%.