Nonlinear-optic and ferroelectric behavior of lithium borate–strontium bismuth tantalate glass–ceramic composite Available to Purchase

Transparent glasses in the system (100–x) $Li2B4O7–xSrBi2Ta2O9$ $(0⩽x⩽20)$ were fabricated via a splat-quenching technique. The glassy nature of the as-quenched samples was established by differential thermal analyses. X-ray powder diffraction and transmission electron microscopic studies confirmed the amorphous nature of the as-quenched and crystallinity (40 nm) in the heat-treated (glass–ceramic) samples. The dielectric constant $(εr)$ of the glass–ceramic composite $(x=20,$ heat treated at 773 K/8 h) was in between that of the parent host glass $(Li2B4O7)$ and strontium bismuth tantalate ceramics in the frequency range 100 Hz–40 MHz at 300 K. These exhibited intense second-harmonic generation and a ferroelectric hysteritic behavior (P vs E loops) at 300 K. The coercive field $(Ec)$ and the remnant polarization $(Pr)$ were 1053 V/cm and 0.483 μC/cm², respectively.