Structural, optical and dielectric properties of glass-nanocomposite

Transparent glass-nanocomposite sample [50Li2B4O7–50(SrO–Bi2O3–Nb2O5)] (mol %) was prepared by a conventional melt-quenching technique. Fluorite (Bi3NbO7) and SrBi2Nb2O9 (SBN) was produced by heat-treating the as-prepared sample at 773 K for 6 h (HT773). The nanocrystallites of fluorite and SBN phases in the Li2B4O7 glass matrix were established by differential thermal analysis (DTA) which is confirmed by X-ray powder diffraction (XRD), infrared spectroscopy and transmission electron microscopic (TEM) studies. The influence of heat-treating the as-prepared sample on the optical properties (transmission, optical band gap and Urbach energy) has been investigated. Properties such as dielectric constant and dielectric loss as a function of frequency (120 Hz –100 k Hz) and temperature (300–829 K) are reported.