Sol-gel synthesis of calcium silicate powder

The calcium silicate powder were prepared by sol-gel methods-varying the synthesis conditions (mixing ratio, temperature and aging period). The precursors of sol-gel procedures were calcium nitrate tetrahydrate and tetraethyl orthosilicate. Nitric acid and water were applied as catalyst. The crystalline structures of calcium silicate product have been varied from amorphous to crystalline phases depending strongly on the preparation conditions. The structures and chemical composition were investigated in atomic range with X-ray diffraction and X-ray fluorescence, respectively. Calcium silicate phase synthesized by using 50:50 mixing ratio of CaO:SiO2 optimally with combination aging and drying process at 110°C.