NDLI: Investigation of metal-induced low-temperature crystallization of SiO/sub 2/ sol-gel glass containing Ag

Content Provider	IEEE Xplore Digital Library
Author	Garnica-Romo, M.G. Gonzalez-Hernandez, J. Hernandez-Landaverde, M.A. Voroblev, Yu.V.
Copyright Year	2000
Description	Author affiliation: Div. de Estudios de Posgrado, UAQ, Queretaro, Mexico (Garnica-Romo, M.G.)
Abstract	The transition of the Ag-doped amorphous SiO/sub 2/ sol-gel produced bulk samples into the crystalline /spl alpha/-crystobalite has been observed during heat treatment at a temperature of 500/spl deg/C, which is much lower than the values reported earlier. For that, silver has to be added to the starting solution in an amount such that it forms aggregates on heat treatment. The other requirement to observe the metal-induced low-temperature crystallization is that the composition of the starting solution (namely, the water-to-TEOS ratio) ought to correspond to some optimal values resulting in samples with an isotropic glass structure. Two possible mechanisms of the effect are discussed; one takes into account the electrostatic screening of the ion's charge by the metal particle surface, and the other considering the interaction of the metal atom with the interatomic bonds of the glass during the diffusion of the atom through the glass. It is shown that both effects lead to local sample heating which could be the reason for the crystallization observed.
Starting Page	269
Ending Page	272
File Size	290147
Page Count	4
File Format	PDF
ISBN	0780359399
DOI	10.1109/ASDAM.2000.889498
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-10-16
Publisher Place	Slovakia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Crystallization Glass Silver Silicon compounds Coatings Amorphous materials Heat treatment Temperature distribution Ethanol Powders
Content Type	Text
Resource Type	Article

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