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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
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]
Número total de Autores: 7
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Journal of Non-Crystalline Solids; v. 378, p. 115-120, OCT 15 2013.
Citações Web of Science: 19
Resumo

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)

Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
Beneficiário:Edgar Dutra Zanotto
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 12/17417-9 - Cinética de cristalização de vidros não estequiométricos
Beneficiário:Edgar Dutra Zanotto
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional