Nonlinear-optic and ferroelectric behavior of lithium borate-strontium bismuth tantalate glass-ceramic composite

Senthil Murugan, G.; Varma, K. B. R.; Takahashi, Yoshihiro; Komatsu, Takayuki
June 2001
Applied Physics Letters;6/18/2001, Vol. 78 Issue 25, p4019
Academic Journal
Transparent glasses in the system (100-x) Li[sub 2]B[sub 4]O[sub 7]-xSrBi[sub 2]Ta[sub 2]O[sub 9] (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 (ε[sub r]) of the glass-ceramic composite (x=20, heat treated at 773 K/8 h) was in between that of the parent host glass (Li[sub 2]B[sub 4]O[sub 7]) 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 (E[sub c]) and the remnant polarization (P[sub r]) were 1053 V/cm and 0.483 μC/cm2, respectively. © 2001 American Institute of Physics.


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