M. Sales et J. Alarcon, CRYSTALLIZATION OF SOL-GEL DERIVED GLASS-CERAMIC POWDERS IN THE CAO-MGO-AL2O3SIO2 SYSTEM .2. CORDIERITE, Journal of Materials Science, 30(9), 1995, pp. 2341-2347
Samples in the cordierite primary crystallization field were prepared
in the CaO-MgO-Al2O3-SiO2 quaternary system by sol-gel techniques, usi
ng both polymeric and colloidal gels. Dried gels were characterized by
infrared spectroscopy, thermal analysis and electron microscopy. The
crystallization of gel-like glass from both kinds of gels, as a functi
on of temperature was followed by X-ray diffraction. Cordierite was de
tected as the only final crystalline phase, although some other crysta
lline phases, different for each kind of gel, were observed in the pat
hway reaction. The polymorphic modification of cordierite detected was
pseudohexagonal, because no evidence of splitting was observed.