Structure and dielectric properties of Ag2O-SeO2-TeO2 mixed former glasses

Abstract Structure and dielectric properties of different compositions of Ag 2 O-SeO 2 -TeO 2 mixed former glasses have been reported in this paper. Amorphous nature of the compositions has been confirmed from X-ray diffraction patterns. Thermal stability of these glasses has been investigated using differential scanning calorimetry and a connection between glass transition temperature and cross-linking density has been established. Fourier transform infrared (FTIR) spectroscopy has been used to investigate the effect of SeO 2 on the glass network structure, and the existence of different structural units, such as TeO 4 , TeO 3 and SeO 3 2 − has been ascertained. The composition dependence of the relative proportion of these structural units has been studied. Dielectric spectra have been analyzed using Cole-Cole model. The relaxation time obtained from the analysis exhibits Arrhenius behavior. The activation energy for the relaxation time shows mixed glass former effect. Further, dielectric properties of these glasses have been correlated with the polarizability along with the optical basicity of these glasses.