The effect of calcium on phase formation in the sodium aluminium silicate carbonate system and the structure of NaCaSiO3OH

N.J. Kenyon, M.T. Weller

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14 Citations (SciVal)

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.
Original languageEnglish
Pages (from-to)185-194
JournalMicroporous and Mesoporous Materials
Volume59
Issue number2-3
DOIs
Publication statusPublished - 19 May 2003

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