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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.)

Sodium Fluoride Solubility and Crystallization in Photo-Thermo-Refractive Glass

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Autor(es):
Fokin, Vladimir M. [1] ; Souza, Guilherme P. [1] ; Zanotto, Edgar D. [1] ; Lumeau, Julien [2] ; Glebova, Larissa [2] ; Glebov, Leonid B. [2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Fed Sao Carlos, Dept Mat Engn, Vitreous Mat Lab, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Cent Florida, CREOL, Coll Opt & Photon, Orlando, FL 32816 - USA
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of the American Ceramic Society; v. 93, n. 3, p. 716-721, MAR 2010.
Citações Web of Science: 14
Resumo

Photo-thermo-refractive (PTR) glass undergoes a refractive index change after UV exposure followed by heat treatment for nanocrystallization of NaF, allowing phase holograms to be permanently recorded in the glass. PTR glass was invented 60 years ago, and optical elements based on PTR glass have been produced for the past decade, but its detailed crystallization mechanism is largely unknown. Since solubility and composition of the parent glass determine the supersaturation and hence the thermodynamic driving force for crystallization, the present paper was aimed at measuring the solubility of NaF in PTR glass via estimating the equilibrium volume fraction of crystallized NaF as a function of temperature. The temperature above which all NaF originally contained in the parent glass remains dissolved in the melt, and that below which all NaF could crystallize, were also estimated. Redesigning of thermal processing parameters and composition of PTR glass, aiming at the improvement of optical elements based on this glass, can be performed in light of the results achieved. (AU)

Processo FAPESP: 08/00475-0 - Vladimir Mikhailovich Fokin | S.I. Vavilov State Optical Institute - Rússia
Beneficiário:Edgar Dutra Zanotto
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
Processo FAPESP: 07/08179-9 - Processos cinéticos em vidros e vitrocerâmicas
Beneficiário:Edgar Dutra Zanotto
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 08/02645-0 - Comportamento térmico e evolução microestrutural de vidro foto-termo-refrativo durante cristalização
Beneficiário:Guilherme Parente Souza
Linha de fomento: Bolsas no Brasil - Pós-Doutorado