Aqueous dispersion comprising silicon/titanium mixed oxide powder with a
BET surface area of 5 to 500 m.sup.2 /g which has been prepared by flame
hydrolysis and has a titanium dioxide content of 0.5 to 20 wt. %, based on
the powder, water and at least one pH-regulating substance which can be
removed completely from the reaction mixture on heating, the aqueous
dispersion having a solids content of between 40 and 80 wt. %. A green
body produced therefrom with a green density of between 40 and 85%. A
shaped glass article of optical quality with a coefficient of thermal
expansion of not more than 0.5.times.10.sup.-6 /K produced from the green
body.
