Thin films prepared from tungstate glass matrix

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Montanari, B. [UNESP]
Ribeiro, S. U. [UNESP]
Messaddeq, Younes [UNESP]
Li, M. S.
Poirier, G.

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Elsevier B.V.


Vitreous samples containing high concentrations of WO3 (above 40% M) have been used as a target to prepare thin films. Such films were deposited using the electron beam evaporation method onto soda-lime glass substrates. These films were characterized by X-ray diffraction (XRD), perfilometry, X-ray energy dispersion spectroscopy (EDS), M-Lines and UV-vis absorption spectroscopy. In this work, experimental parameters were established to obtain stable thin films showing a chemical composition close to the glass precursor composition and with a high concentration of WO3. These amorphous thin films of about 4 mu m in thickness exhibit a deep blue coloration but they can be bleached by thermal treatment near the glass transition temperature. Such bleached films show several guided modes in the visible region and have a high refractive index. Controlled crystallization was realized and thus it was possible to obtain WO3 microcrystals in the amorphous phase. (C) 2007 Elsevier B.V. All rights reserved.



glass, tungsten, thin film

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Applied Surface Science. Amsterdam: Elsevier B.V., v. 254, n. 7, p. 2085-2089, 2008.