Structural, Dielectric, Pyroelectric and Ferroelectric Properties of Glass Nano Composite: Lithium Borate-Strontium Bismuth Vanadium Niobate

Venkataraman, Harihara B and Varma, KBR (2006) Structural, Dielectric, Pyroelectric and Ferroelectric Properties of Glass Nano Composite: Lithium Borate-Strontium Bismuth Vanadium Niobate. In: Ferroelectrics Letters, 33 (3-4). pp. 39-56.

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Abstract

Transparent glasses in the system (100−x) $(Li_2O-2B_2O_3)-x (SrO-Bi_2O_3-0.7Nb_2O_5-0.3V_2O_5)$ $(10 \le x \le 60$, in molar ratio) were fabricated via the melt quenching technique. The as-quenched samples were X-ray amorphous. Differential thermal analysis (DTA) confirmed the glassy nature of the as-quenched samples. Strontium bismuth vanadium niobate nanorods were grown by controlled heat-treatment of the as-quenched glasses at 783 K for 6 h. The formation of nanorod layered perovskite $SrBi_2(Nb_{0.7}V_{0.3})_2O_{9-\delta}$ (SBVN) phase via an intermediate fluorite phase was confirmed by both X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The dielectric constants of both the as-quenched and heat-treated samples (783 K/6 h) increased while the dielectric loss (D) decreased with increasing x (SBVN content). Interestingly, the dielectric constant of the glass nanocrystal composite (heat-treated at 783 K/6 h) exhibited an anomaly in the vicinity of the crystallization temperature of the host glass $(Li_2B_4O_7)$ reaching a value as high as $\approx 10^6$ at 800 K. These glass nanocrystal composites were pyroelectric and ferroelectric at 300 K.

Item Type:	Journal Article
Publication:	Ferroelectrics Letters
Publisher:	Taylor & Francis Group
Additional Information:	Copyright of this article belongs to Taylor & Francis Group.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	27 May 2008
Last Modified:	19 Sep 2010 04:45
URI:	http://eprints.iisc.ac.in/id/eprint/14058

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