Glass nanocomposite of strontium bismuth niobate and lithium borate: structural and dielectric investigations

Prasad, Syam N and Subbanna, GN and Varma, KBR (2001) Glass nanocomposite of strontium bismuth niobate and lithium borate: structural and dielectric investigations. In: Materials Letters, 47 (1-2). pp. 11-19.

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Abstract

Glass nanocomposites (GNC) in the system (100 - x)Li2B4O7 - xSrBi(2)Nb(2)O(9) (0 less than or equal to x less than or equal to 30) were prepared by splat quenching technique. The as-quenched samples of all the compositions under study have been confirmed to be amorphous by X-ray powder diffraction (XRD) studies. Differential thermal analyses (DTA) suggest the glassy nature of the as-quenched samples. High-resolution transmission electron microscopic (HRTEM) studies carried out on heat-treated samples reveal the presence of platy crystallites of SrBi2Nb2O9(SBN) dispersed in the glassy matrix of Li2B4O7 (LBO). The dielectric constant (epsilon (r)) and the dielectric loss (D) decrease with increase in frequency (100 Hz-10 MHz) at 300 K. The influence of the composition and the microstructure on the dielectric properties of the LBO-SBN nanocomposite has been established. The optical transmission characteristics of these GNC could be varied as a function of its composition.

Item Type:	Journal Article
Publication:	Materials Letters
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	glass nanocomposites;Li2B4O7+SrBi2Nb2O9;lithium borate plus strontium bismuth niobate;X-ray diffraction;electron microscopy;dielectric properties.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	23 Jul 2009 05:02
Last Modified:	19 Sep 2010 04:54
URI:	http://eprints.iisc.ac.in/id/eprint/16998

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