Saikia Chaliha, Reenamoni and Tarafder, Anal and Annapurna, K and Karmakar, Basudeb (2010) Preparation and Properties of BaBiBO4-SiO2 Glasses. International Journal of Applied Glass Science, 1 (4). pp. 368-377. ISSN 2041-1294

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Abstract

Glasses in the new system (100-x) BaBiBO4–xSiO2 where x = 10–50 (mol%) were prepared by the melt-quench technique. The density of the glasses increases with an increase in BaBiBO4 content because of its higher molecular mass. Tg, Td,and Ts decrease while coefficient of thermal expansion increases with the increase in BaBiBO4 content. Vis-NIR spectra reveal that with increasing melting temperature transmission of the glasses decreases due to auto thermal reduction of Bi31 to Bi0 as confirmed by transmission electron microscopy and selected area electron diffraction analyses. Fourier transform infrared reflection spectroscopic spectra of the glasses indicate the formation of BiO6, BO3, and BO4 structural units. Ferroelectric BaBiBO4 crystalline phase is obtained from these glasses by controlled heat treatment at 5801C. X-ray diffraction analysis reveals its 45–66nm crystallite size range. Whereas, the field-emission scanning electron microscopy images show the formation of polycrystalline spherical grains of 89–194nm along with single-crystalline microrods of average diameter of 0.5–1.5 mm. Dielectric constant of the glasses increases with increase in BaBiBO4 content, which is attributed to the combined effects of high polarization and ionic refraction of both Bi31 and Ba21 ions. It is shown here that BaBiBO4–SiO2 is a promising glass system for the synthesis of glass–ceramics of novel BaBiBO4 nonlinear optical crystal.

Item Type:	Article
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	26 Mar 2012 10:52
Last Modified:	15 Feb 2017 07:27
URI:	http://cgcri.csircentral.net/id/eprint/1377

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