Biswas, Kaushik and Sontakke, Atul D and Balaji, S and Molla, Atiar Rahaman and Annapurna, K (2013) Crystallization kinetics and luminescence properties of a new low phonon Bi2O3-ZnO-GeO2 glass. Physics And Chemistry of Glasses-European Journal of Glass Science and Technology Part B , 54 (5). pp. 206-215. ISSN 1753-3562

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Abstract

In this work, a novel and low phonon oxide glass based on the Bi2O3-ZnO-GeO2 system has been formulated and its structural, optical properties together with crystallization kinetics under non-isothermal conditions were investigated in detail. The crystalline phase formed during optimized ceramization process was identified as cubic Bi2O3 by x-ray diffraction. The activation energy (E-c) for the first crystallization event during formation of Bi2O3 was estimated using various well established models and ranges between 258.6-308.5 kJ/mol. The Avrami exponents determined by the Augis-Bennett model and the Matusita model indicate that Bi2O3 phase formation is dominated by two-dimensional surface crystallization. The coupling phonon energy associated with do pant rare earth ions in this host has been established using Eu3+ as a spectral probe and it has been observed from the phonon side band (PSB) that the phonon energy surrounding the do pant rare earth ion is around 465 cm(-1). This low phonon energy coupling with Ho3+ ions in the present glass has resulted in mid-infrared emissions at 2.9 mu m and 2.0 mu m due to the reduced non-radiative relaxations.

Item Type:	Article
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	05 Feb 2014 12:21
Last Modified:	12 Mar 2016 14:44
URI:	http://cgcri.csircentral.net/id/eprint/2479

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