Optical and structural properties of Mn2+ doped PbGeO3-SbPO4 glasses and glass-ceramics

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Author(s):	Volpi, V. ; Montesso, M. ; Ribeiro, S. J. L. ; Viali, W. R. ; Magon, C. J. ; Silva, I. D. A. ; Donoso, J. P. ; Nalin, M. Total Authors: 8
Document type:	Journal article
Source:	Journal of Non-Crystalline Solids; v. 431, p. 5-pg., 2016-01-01.
Abstract
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. (AU)

FAPESP's process:	13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:	Edgar Dutra Zanotto
Support Opportunities:	Research Grants - Research, Innovation and Dissemination Centers - RIDC