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Type: Artigo de evento
Title: Nucleation And Growth Of Cdte1-xsx Nanocrystals Embedded In A Borosilicate Glass. Effects Of Sulfur Content And Two-step Thermal Annealing
Author: Kellermann G.
Craievich A.F.
Barbosa L.C.
Alves O.L.
Abstract: Nucleation and growth of CdTe1-xSx nanocrystals embedded in a borosilicate glass matrix and submitted to isothermal annealing were studied by small-angle X-ray scattering (SAXS). Two different sulfur contents (x=0.3 and x=0.7) were investigated. The formation and growth of the nanocrystals was studied in situ, maintaining the samples at a constant temperature (560 °C) inside a high-temperature cell. The effect of a nucleation pretreatment at 460 °C on the characteristics of nanocrystal formation and growth was also studied. The experimental results demonstrate that, in composites with high sulfur content (x=0.7), nanocrystals grow during the isothermal annealing by coarsening of preformed small crystals. In glasses with low sulfur content (x=0.3), nanocrystals grow by progressive diffusion of Cd, Te and S atoms initially dispersed in the glass matrix. © 2001 Elsevier Science B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0022-3093(01)00769-4
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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