Abstract
Layer-structured potassium hydrogen disilicate (KHSi2O5) containing alkaline earth metal Ca is directly synthesized in an aqueous system. The effects of sol composition and crystallization temperature on final products are investigated in details. Highly crystallized Ca–KHSi2O5 is prepared from the sol with initial composition of 0.15CaO:SiO2:0.4K2O:0.1TEAOH:30H2O at 493K for 5 days in a high yield. Ca–KHSi2O5 samples with a wide range of Ca/Si molar ratio from 0 to 0.15 are prepared in the system containing KOH above 423K. Both altered peak intensity and shifted peak position in XRD pattern as well as the presence of band indexed to Si–O–Ca in Fourier transform infrared spectrum for resultant sample confirm the Ca incorporation. SEM–EDS mappings of the selected sample also disclose that Ca atoms are highly dispersed on the Si matrix.
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