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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Crystal nucleation and growth kinetics of NaF in photo-thermo-refractive glass

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Dyamant, I. [1] ; Abyzov, A. S. [2] ; Fokin, V. M. [3] ; Zanotto, E. D. [1] ; Lumeau, J. [4] ; Glebova, L. N. [5] ; Glebov, L. B. [5]
Total Authors: 7
[1] Univ Fed Sao Carlos, Dept Mat Engn, Vitreous Mat Lab, UFSCar, BR-13565905 Sao Carlos, SP - Brazil
[2] Natl Sci Ctr, Kharkov Phys & Technol Inst, Kharkov - Ukraine
[3] SI Vavilov State Opt Inst, St Petersburg 193171 - Russia
[4] Aix Marseille Univ, CNRS, UMR 7249, Cent Marseille, Inst Fresnel, F-13013 Marseille - France
[5] Univ Cent Florida, Coll Opt & Photon, CREOL, Orlando, FL 32816 - USA
Total Affiliations: 5
Document type: Journal article
Source: Journal of Non-Crystalline Solids; v. 378, p. 115-120, OCT 15 2013.
Web of Science Citations: 20

Photo-thermo-refractive (PTR) glass is an optically transparent photosensitive oxide glass. Upon heating, the UV-exposed regions of this glass undergo copious crystallization of NaF nano-crystals giving rise to a permanent, localized refractive index change. But the unexposed parts of the glass also undergo some crystallization which causes unwanted light scattering. Holographic optical elements produced from PTR glass have been used in special laser systems. In this article we report, for the first time since the invention of PTR glass about half a century ago, the steady-state nucleation rates, nucleation time-lags and crystal growth rates for UV-unexposed PTR glass estimated in a wide temperature range, from T-g - 470 degrees C up to 750 degrees C A self-consistent description of these data is presented in the framework of classical nucleation theory using the interfacial free energy of the critical nuclei and the effective diffusion coefficient as adjustable parameters. The diffusivity calculated from crystallization kinetics and that estimated from viscous flow via the Stokes-Einstein-Eyring equation show a decoupling phenomenon. (C) 2013 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 12/17417-9 - Crystallization kinetics of non-stoichiometric glass-forming compositions
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Visiting Researcher Grant - International
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC