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Structural, dielectric, impedance and optical properties of CaBi2B2O7 glasses and glass-nanocrystal composites

Majhi, Koushik and Varma, KBR (2009) Structural, dielectric, impedance and optical properties of CaBi2B2O7 glasses and glass-nanocrystal composites. In: Materials Chemistry and Physics, 117 (2-3). pp. 494-499.

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Optically clear glasses were fabricated by quenching the melt of CaCO3-Bi2O3-B2O3 (in equimolecular ratio). The amorphous and glassy characteristics of the as-quenched samples were confirmed via the X-ray powder diffraction (XRD) and differential scanning calorimetric (DSC) studies These glasses were found to. have high thermal stability parameter (S). The optical transmission studies carried out in the 200-2500 nm wavelength range confirmed both the as-quenched and heat-treated samples to be transparent between 400 nm and 2500 nm. The glass-plates that were heat-treated just above the glass transition temperature (723 K) for 6 h retained approximate to 60% transparency despite having nano-crystallites (approximate to 50-100 nm) of CaBi2B2O7 (CBBO) as confirmed by both the XRD and transmission electron microscopy (TEM) studies. The dielectric properties and impedance characteristics of the as-quenched and heat-treated (723 K/6 h) samples were studied as a function of frequency at different temperatures. Cole-Cole equation was employed to rationalize the impedance data.

Item Type: Journal Article
Publication: Materials Chemistry and Physics
Publisher: Elsevier Science
Additional Information: Copyright for this article belongs to Elsevier Science.
Keywords: Glasses; Nanocrystal composites; Thermal properties; Electrical properties; Transmission electron microscopy (TEM)
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 03 Jan 2010 09:20
Last Modified: 19 Sep 2010 05:52
URI: http://eprints.iisc.ac.in/id/eprint/24912

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