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Kenyon, N. J.
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article
The effect of calcium on phase formation in the sodium aluminium silicate carbonate system and the structure of NaCaSiO3OH
Abstract
The effect of calcium on the hydrothermal syntheses of aluminosilicate frameworks in the presence of carbonate at 150 and 220 °C has been studied. Under calcium-free conditions the formation of the cancrinite framework (220 °C), [Na8(CO3) · (H2O)n][AlSiO4]6––CAN, and a disordered cancrinite/sodalite intergrowth (150 °C) are observed in agreement with the literature. Addition of calcium to the synthesis media results in its incorporation into these framework structures to give [NaxCay(CO3){x+2y−6}/2(H2O)n][AlSiO4]6––CAN, as evidenced by decreases in the cell volumes and EDAX analysis. At high concentrations of calcium a new phase, NaCaSiO3OH, forms and the structure of this material, which contains ordered strongly hydrogen-bonded SiO3OH units, has been defined using neutron diffraction.