J. Phys. IV France
Volume 02, Numéro C2, Octobre 1992
European Workshop on Glasses and Gels
Page(s) C2-141 - C2-144
European Workshop on Glasses and Gels

J. Phys. IV France 02 (1992) C2-141-C2-144

DOI: 10.1051/jp4:1992217

Nucleation and crystallisation in xerogel induced and probed by Cr

W. NIE1 and G. BOULON2

1  LSM/CRT, Kodak-Pathé, 71102 Chalon sur Saône, France
2  Laboratoire de Physico-Chimie des Matériaux Luminescents, Université Lyon I, URA au CNRS n° 442, Bâtiment 205, 69622 Villeurbanne Cedex, France

Nucleation and crystallization from xerogels of the system SiO2-ZnO-Al2O3 are induced and probed by Cr. Besides the traditional techniques, such as X-ray diffraction, SAXS and TEM, ESR and optical techniques especially laser spectroscopy are employed for the investigation of the structural evolution during thermal treatments of these xerogels. Cr is served not only as a structure probe but also a nucleating agent. The devitrification of the system is found to be essentially initiated by the presence of traces of chromium.

© EDP Sciences 1992