Influence of molybdenum ions on the structure of ZnO–As 2O 3–Sb 2O 3 glass system by means of spectroscopic and dielectric studies

Abstract

Glasses of the composition 5 ZnO–(50 − x) As 2O 3–45 Sb 2O 3:x MoO 3, with six values of x ranging from 0 to 10 mol% are prepared. The samples are characterized by X-ray diffraction, scanning electron microscopy and differential thermal analysis (DTA) techniques. A number of studies, viz., spectroscopic properties (optical absorption, IR, Raman, and ESR spectra), magnetic susceptibility and dielectric properties (dielectric constant ε′, loss tan δ, ac conductivity σ ac over a wide range of frequency and temperature as well as dielectric break down strength at room temperature), are carried out as a function of molybdenum ion concentration and analyzed in the light of different oxidation states of molybdenum. The analyses of the results indicate that molybdenum ions mostly exist in Mo 5+ state rather than in Mo 6+ state.