The effect of tetraetoxysilan hydrolysis conditions on forsterite synthesis

The sol-gel process of forsterite synthesis from magnesium acetate and tetraethoxysilane (TEOS) has been studied. The influence of the conditions of hydrolysis of TEOS on the morphology and phase composition of powders was studied. It was found that a stable sol, which turns into a gel, forms a solution of magnesium acetate and a hydrolyzate of TEOS in an acidic medium. In this case, the forsterite yield after heat treatment at 800 ° C is 97%. Carrying out hydrolysis in an alkaline medium and combining hydrolysis and precipitation of magnesium hydroxide provide a weakly aggregated powder with a composition close to monofractional, but increase the temperature of forsterite synthesis. Tab. 1, ill. 3, bibliography: 5 titles.