Abstract
PbO-Sb2O 3 -B 2 O3 glasses containing different concentrations of MoO 3 ranging from 0 to 5 mol % were prepared. A number of studies have been carried out on these glasses comprising differential thermal analysis, infrared and optical absorption, Raman and ESR spectra, magnetic susceptibility and measurements of dielectric properties (constant e', loss tan δ and a.c. conductivity σ ac . over a range of frequency and temperature) of these glasses. The results have been analyzed in terms of different oxidation states of molybdenum ions. The'analysis indicates that when the concentration of MoΟ 3 is <0.6 mol %, molybdenum ions exist mostly in the Mo 6+ state, occupy network forming positions with MoO 2- 4 structural units and increase the rigidity of the glass network. When MoO 3 is present in higher concentrations, molybdenum ions seem to exist mostly in the Mo 5+ state and occupy modifying positions.
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