Abstract
CaSiO3 and Ca2SiO4 gels were prepared by sol-gel method using a calcium metal, methanol, and tetrametyoxysiliane as starting materials. The formation of CaSiO3 and Ca2SiO4 by heating the gels at various temperatures was investigated by using X-ray diffraction. It was found that single phases of β-CaSiO3, α-CaSiO3, and β-Ca2SiO4 were synthesized at 700°C, 1200°C, and 700°C, respectively. These formation temperatures were lower than those obtained in other method. Furthermore, the formation process was different from that observed for calcined powder of CaCO3 and SiO2 prepared by the conventional solid-state reaction method.
