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Volume 18, Issue 1, Pages 53-60

Influence of the pH Values of the Sol–Gel State on the Properties of SnO2 Powders Obtained From a Sol–Gel Route

1Laboratoire de Chimie du Solide du CNRS, Université Bordeaux I, 351 Cours de la Libération, Talence cedex 33405, France
2Korea Institute of Energy Research, 71-1 Jang-dong, Yoosung-gu Taedok Science Town, Taejon 305-343, Korea
3Institut de Chemic de la Matièra Condensée de Bordeaux, CNRS, Université Bordeaux I, Chateau Brivazac, Ave du Dr. A. Schweitzer, Pessac 33600, France

Received 20 November 1994; Accepted 30 November 1994

Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The evolution of the specific surface area and crystallite size of SnO2 powders, prepared from a sol-gel process, was studied as a function of the calcination temperature of the stannic hydroxyde colloid, and for two different pH values (7.5 and 12.5) of the colloïdal state. The samples were characterized by TGA, IR spectroscopy, BET, and XRD techniques. The crystallite size and specific surface area were strongly affected not only by the calcination temperature, but unexpectedly, by the initial pH value of the colloïdal state. A framework model, relating the pH dependence to the resulting properties, is presented.