Glass nancomposite of strontium bismuth niobate and lithium borate: structural and dielectric investigations

摘要

Glass nanocomposites (GNC) in the system (100-x)Li_2B_4O_7 - xSrBi_2Nb_2O_9 (0≤X≤30) were prepared by splat quenching technique. The as-quenched samples of all the compositions under study have been confirmed to be amorphous by X-ray powder diffraction (XRD) studies. Differential thermal analyses (DTA) suggest the glassy nature of the as-quenched samples. High-resolution transmission electron microscopic (HRTEM) studies carried out on heat-treated samples reveal the presence of platy crystallites of SrBi_2Nb_2O_9(SBN) dispersed in the glassy matrix of Li_2B_4O_7 (LBO). The dielectric constant (ε_r) and the dielectric loss (D) decrease with increase in frequency (100 Hz-10 MHz) at 300 K. The Influence of the composition and the microstructure on the dielectric properties of the LBO-SBN nanocomposite has been Established.