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Lithium niobate bulk crystallization promoted by CO2 laser radiation

Ferreira, N. ; Costa, F. M. ; Nogueira, R.N. ; Graça, M.P.F.

Applied Surface Science Vol. 258, Nº 23, pp. 9457 - 9460, September, 2012.

ISSN (print): 0169-4332
ISSN (online):

Journal Impact Factor: 1,576 (in 2008)

Digital Object Identifier: 10.1016/j.apsusc.2011.08.050

Abstract
The crystallization induced by laser radiation is a very promising technique to promote glass/ceramic transformation, being already used to produce crystalline patterns on glass surfaces. In this work, a SiO2–Li2O–Nb2O5 glass, prepared by the sol–gel route, was submitted to CO2 laser radiation and conventional heat-treatments in order to induce the LiNbO3 crystallization. The structure and morphology of the samples prepared by both routes was analyzed as a function of exposure time, radiation power and heat-treatment temperatures by XRD, Raman spectroscopy and SEM. The results reveal a correlation between the crystallization degree of LiNbO3 particles and glass matrix with the heat treatment type and experimental parameters. An heat-treatment at 650 °C/4 h was necessary to induce crystallization in heat treatments samples while 4 W/500 s was enough for laser radiation ones, corresponding a reduction time processing of ∼14 000 s