Gel synthesis of glass powders in the BaO---Al2O3---SiO2 system

Homogeneous glass powders were prepared from multicomponent silicate gels in the BaO---Al₂O₃---SiO₂ system. Gels synthesized from TEOS, Al-sec-butoxide, and Ba-acetate were characterized by TGA, DSC, and single-point BET analysis. Amorphous oxide powders of controlled composition were obtained through an appropriate drying and heat treatment schedule. Inclusion-free clear oxynitride glasses were also prepared by co-melting gel synthesized oxide powders with silicon nitride powders.