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Dielectric anomaly in strontium borate-bismuth vanadate glass nanocomposite

Prasad, Syam N and Varma, KBR and Lang, Sidney B (2001) Dielectric anomaly in strontium borate-bismuth vanadate glass nanocomposite. In: Journal of Physics and Chemistry of Solids, 62 (7). pp. 1299-1311.

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Official URL: http://dx.doi.org/10.1016/S0022-3697(01)00024-5


Transparent glass nanocomposites in the pseudo binary system (100 - x) SrB4O7 (SBO)-x Bi2VO5.5 (BiV) (0 less than or equal to n less than or equal to 70) were prepared by the splat quenching technique. The nano-crystallization of bismuth vanadate (BiV) in 50 SBO-50 BiV (in mol%) glass composite has been demonstrated. These were characterized for their structural, thermal and dielectric properties. As-quenched composites under study have been confirmed to be amorphous by X-ray powder diffraction (XRD) studies. The glass transition temperature (T-g) and crystallization temperatures (T-er) were determined using differential thermal analyses (DTA), High resolution transmission electron microscopic (HRTEM) studies carried out on heat-treated samples reveal the presence of spherical nanosize crystallites of Bi2VO5.5 (BiV) dispersed in the glassy matrix of SrB4O7 (SSO). The dielectric constant (epsilon (r)) and the dielectric loss (D) measurements were carried out on the as-quenched and heat-treated glass nanocomposite samples in the frequency range 100 Hz-10 MHz. The as-quenched and the heat-treated at two different temperatures (720 and 820 K) samples exhibited broad dielectric anomalies in the vicinity of the ferroelectric-to-paraelectric transition temperature of the parent BiV ceramics. The Curie-Weiss law was found to be valid at a temperature above the transition temperature, establishing the diffused nature of the transition. (C) 2001 Elsevier Science Ltd. All rights reserved.

Item Type: Journal Article
Publication: Journal of Physics and Chemistry of Solids
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: A. Glasses;A. Nanostructures;C. X-ray diffraction;D. Dielectric properties.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 02 Aug 2011 07:02
Last Modified: 02 Aug 2011 07:02
URI: http://eprints.iisc.ac.in/id/eprint/39526

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