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

Murugan, Senthil G and Varma, KBR and Takahashi, Yoshihiro and Komatsu, Takayuki (2001) Nonlinear-optic and ferroelectric behavior of lithium borate–strontium bismuth tantalate glass–ceramic composite. In: Applied Physics Letters, 78 (25). pp. 4019-4021.

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Abstract

Transparent glasses in the system (100–x) $Li_2B_4O_7 –xSrBi-2Ta_2O_9 (0 \leq x \leq 20)$ 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 (\epsilon r) of the glass–ceramic composite (x = 20, heat treated at 773 K/8 h) was in between that of the parent host glass $(Li_2B_4O_7)$ 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 $(E_c)$ and the remnant polarization $(P_r)$ were 1053 V/cm and 0.483 µC/cm2, respectively.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Institute of Physics (AIP).
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 07 Jun 2005
Last Modified: 19 Sep 2010 04:19
URI: http://eprints.iisc.ernet.in/id/eprint/3285

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