Optical and structural properties of Mn2+ doped PbGeO3-SbPO4 glasses and glass-ceramics
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This paper shows the study of optical and structural properties of SbPO4-PbGeO3-MnCl2 glass and glass-ceramics. Glass was prepared by melting-quenching methodology while the glass ceramic was obtained by controlled thermal treatment of the glass. The UV-Vis results show that the glass presents only Mn2+ species, but, the thermal treatment leads to oxidation of Mn2+ to Mn3+ species, what was evidenced by an absorption band in the visible range. High resolution transmission electron microscopy shows the presence of nanocrystalline phases of Mn2O3 and PbGeO3 confirming the formation of a glass-ceramic Electron paramagnetic resonance measurements suggest that manganese ions occupy only one environment in the glass. On the other hand, for glass-ceramic at least three different structural sites were identified by simulation of the EPR signal. (C) 2015 Elsevier B.V. All rights reserved.