Biswas, Kaushik and Sontakke, Atul D and Annapurna, K (2010) Effect of TiO(2) on thermal, structural and third-order nonlinear optical properties of Ca-La-B-O glass system. Journal of Alloys and Compounds, 489 (2). pp. 493-498. ISSN 0925-8388

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A series of calcium lanthanum metaborate glasses in the composition (wt%) of 23.88CaO-28.33La(2)O(3)-47.79B(2)O(3) modified with TiO(2) up to 20 wt% are prepared by a melt quenching technique to study the influence of TiO(2) on their thermal, structural, linear and nonlinear optical properties. The differential thermal analysis (DTA) studies have demonstrated significant effects due to the presence of TiO(2) on the glass forming ability and crystallization situations. The glass with 15wt% TiO(2) has achieved a eutectic composition and also exhibited a better glass forming ability among the glasses studied. The FT-IR spectra of these glasses show mainly vibration modes corresponding to stretching of BO(3) trigonal, BO(4) tetrahedral units and of B-O-B bending bonds. At higher concentrations of TiO(2), development of vibration band around 400 cm(-1) has indicated the formation of TiO(6) structural units in the glass network. The red shift of optical absorption edge (UV cutoff) shows a monotonous decrease in direct and indirect optical band gap energies (E(opt)) with an increase of TiO(2) content in the glasses based on their absorption spectra. The optical transparency of these glasses is found to be varied from 64 to 87% within the wavelength range 450-1100 nm depending on the TiO(2) content. Besides these studies, linear refractive indices, the nonlinear optical properties of these glasses have also been evaluated. (C) 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Amorphous materials; Optical materials; Quenching; Thermal analysis
Subjects: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 01 Feb 2012 11:41
Last Modified: 09 Mar 2016 11:01

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