期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 458, 期 1-2, 页码 66-76出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.04.143
关键词
PbO-Nb2O5-P2O5 glasses; optical properties; dielectric properties
PbO-Nb2O5-P2O5 glasses containing different concentrations of MnO ranging from 0 to 2.5 mol% were prepared. A number of studies viz., differential thermal analysis, infrared, optical absorption, luminescence, Raman and ESR spectra, magnetic susceptibility and dielectric properties (constant epsilon ', loss tan delta, ac conductivity sigma(ac) over a range of frequency and temperature) of these glasses have been carried out. The results have been analyzed in the light of different oxidation states of manganese ions. The analysis indicates that when the concentration of MnO is around 1.0 mol%, manganese ions mostly exist in Mn2+ state, occupy network forming positions with MnO4 structural units and increase the rigidity of the glass network. When MnO is present in higher concentrations, these ions seem to exist mostly in Mn3+ state and occupy modifying positions. (c) 2007 Elsevier B.V. All rights reserved.
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