Structural Analysis of Silicate Anions in Calcium Silicates by Trimethylsilylation Method

概要

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In order to establish the availability of trimethylsilylation (TMS) method, which was applied to change of silicic acid groups having various structures in the formation process of calcium silicates. The results were compared with those of different techniques of X-ray diffraction and infrared spectroscopy. The calcium silicates were prepared by heating the mixture of Ca (OH) 2 and SiO2·nH2O of varying Ca/Si atomic ratios of 1/1, 3/2 and 2/1 at 400-1400°C for 3 hours. In the case of Ca/Si atomic ratio of 1/1, it was found from the results obtained by applying the TMS method to formation of low crystalline calcium silicates consisting in ranges of monomer to cyclic tetramer from temperature at 600°C and especially, to presence of Si2O76- ion due to Ca3Si2O7 that did not identified by X-ray diffraction and infrared spectrum. It was confirmed that the heated product above 1100°C must be converted to p-CaSiO3 having low temperature type at room temperature but was stabilized to α-CaSiO3 (Ca3Si3O9) having high temperature type as trimer and existed together Si2O76- ion and SiO44- ion due to β-Ca2SiO4. In the formation process of Ca/Si atomic ratio of 2/1, the heated product showed the formation of monomer to cyclic tetramer at temperature above 600°C but finally changed to SiO44- ion. The above results obtained by Lentz's method were partially compared with those of Masson's method.
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