Electrical and spectroscopic properties of Fe2O3 doped Na2SO4-BaO-P2O5 glass system

► Na2SO4-BaO-P2O5 glasses doped with different concentrations of Fe2O3 were prepared. ► Spectroscopic and dielectric spectral features have been studied. ► Ac conductivity in the low temperature is explained based on QMT model. ► Analysis of the dc conductivity indicated that at T > θD/2, SPH model is appropriate. ► Dielectric relaxation effects are analyzed using Cole-Cole plots and spreading of τ is established.