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Characterization of lithium borate–bismuth tungstate glasses and glass-ceramics by impedance spectroscopy

Murugan, Senthil G and Varma, KBR (2001) Characterization of lithium borate–bismuth tungstate glasses and glass-ceramics by impedance spectroscopy. In: Solid State Ionics, 139 (1-2). pp. 105-112.

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Official URL: http://dx.doi.org/10.1016/S0167-2738(00)00825-0

Abstract

Transparent glasses in the system (1−x)Li2B4O7–xBi2WO6 (0≤x≤0.35) were prepared via melt quenching technique. Differential thermal analysis was employed to characterize the as-quenched glasses. Glass-ceramics with high optical transparency were obtained by controlled heat-treatment of the glasses at 720 K for 6 h. The amorphous nature of the as-quenched glass and crystallinity of glass-ceramics were confirmed by X-ray powder diffraction studies. High resolution transmission electron microscopy (HRTEM) shows the presence of nearly spherical nanocrystallites of Bi2WO6 in Li2B4O7 glass matrix. Capacitance and dielectric loss measurements were carried out as a function of temperature (300–870 K) in the frequency range 100 Hz–40 MHz. Impedance spectroscopy employed to rationalize the electrical behavior of glasses and glass-ceramics suggest the coexistence of electronic and ionic conduction in these materials. The thermal activation energies for the electronic conduction and ionic conduction were also estimated based on the Arrhenius plots.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Lithium borate;Bismuth tungstate;Glass;Glass-ceramic; Impedance spectroscopy.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 02 Aug 2011 08:33
Last Modified: 02 Aug 2011 08:33
URI: http://eprints.iisc.ernet.in/id/eprint/39515

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