Mesoporous calcium silicate glasses. I. Synthesis

摘要: Abstract The conventional method of preparing glasses is quenching a melt. However, as with many multicomponent glasses, only certain range CaO–SiO2 compositions can be melt derived. Sol–gel processing allows one to produce gel-glasses lying within the liquid–liquid immiscibility dome system. Crack-free silica–calcia xerogel monoliths various shapes and sizes expressed by following formula xCaO·(1−x)SiO2, where 0⩽x⩽0.5 mole fraction, were prepared via sol–gel technique, starting from tetraethyl orthosilicate calcium nitrate. In this paper technique described. materials produced characterised using X-ray diffraction, infrared (FTIR) spectroscopy, energy dispersive scanning electron microscopy (SEM-EDS) well differential thermal analysis (DTA). are confirmed amorphous even after stabilisation at 600 °C, crystallisation temperatures above 850 °C. When sintered 1000 °C they form crystalline phases in accordance phase diagram. Acid digestion confirms that similar computed values. homogeneous throughout monolith.