Spectroscopic investigation of some lead phosphate oxide glasses containing manganese ions

The structural investigation of the xMnO(100 - x)[2P(2)O(5). PbO)] vitreous system with 0 less than or equal to x less than or equal to 50 mol% was re alised using IR spectroscopy, electron paramagnetic resonance (EPR), magnet ic susceptibility and photoacoustic (PA) measurements. The characteristic f requencies of different atomic group vibrations were identified. The depend ence of the position and shape of these bands with the MnO content of these glasses was explained. The EPR and magnetic susceptibility data suggest th at in these glasses the Mn ions exists only in divalent state; these ions a re isolated or participate to dipole-dipole interactions. The concentration dependence of the thermal diffusivity coefficient shows that complex struc tural changes appear in these glasses for x less than or equal to 5 mol%, i n agreement with IR and EPR data. (C) 1999 Elsevier Science B.V. All rights reserved.