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Phase separation in gel-derived materials, separation and crystallization of SnO2 within an amorphous SiO2 matrix

Published online by Cambridge University Press:  31 January 2011

R. Dal Maschio ,
S. Dirè ,
G. Carturan ,
S. Enzo  and
L. Battezzati
R. Dal Maschio
Affiliation:
Department of Materials Engineering, University of Trento, 38050 Mesiano di Povo, Trento, Italy
S. Dirè
Affiliation:
Department of Materials Engineering, University of Trento, 38050 Mesiano di Povo, Trento, Italy
G. Carturan
Affiliation:
Department of Materials Engineering, University of Trento, 38050 Mesiano di Povo, Trento, Italy
S. Enzo
Affiliation:
Department of Physical Chemistry, University of Venice, Calle Larga, S. Marta 2137, 30100 Venice, Italy
L. Battezzati
Affiliation:
Department of Inorganic, Physical and Materials Chemistry, University of Torino, Via P. Giuria 9, 10125 Torino, Italy
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Abstract

On heating a gel of composition 33.5SnO2−66.5SiO2 (wt. %) up to 1050 °C, SnO2 crystallization occurred with different mechanisms according to thermal treatments. Thermal analysis, SAXS (Small Angle X-Ray Scattering), WAXS (Wide Angle X-Ray Scattering), and TEM (Transmission Electron Microscopy) results obtained for samples treated at different temperatures demonstrated that the SnO2 load is divided into two moieties, one composed of isolated SnO2 particles suitable for primary crystallization yielding crystallites with 4.0 nm of average size; the other, being dissolved in SiO2, remains in the amorphous SiO2/SnO2 solid solution up to the highest temperature. The presence of these two phases accounts for SnO2 surface segregation at the expense of the SnO2 concentration of neighboring outer layers and the independence of apparent density on temperature.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 2 , February 1992 , pp. 435 - 443
Copyright
Copyright © Materials Research Society 1992

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