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

Kenyon, N. J. and Weller, M. T. (2003) The effect of calcium on phase formation in the sodium aluminium silicate carbonate system and the structure of NaCaSiO3OH Microporous and Mesoporous Materials, 59, (2-3), pp. 185-194. (doi:10.1016/S1387-1811(03)00310-X).

Record type: Article

Abstract

The effect of calcium on the hydrothermal syntheses of aluminosilicate frameworks in the presence of carbonate at 150 and 220 degreesC has been studied. Under calcium-free conditions the formation of the cancrinite framework (220 degreesC), [Na-8(CO3)(.)(H2O)(n)][AlSiO4](6)-CAN, and a disordered cancrinite/sodalite intergrowth (150 degreesC) 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, ha's been defined using neutron diffraction.

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More information

Published date: 19 May 2003
Keywords: cancrinite, calcium, silicate, structure, neutron diffraction bayer process

Identifiers

Local EPrints ID: 19993
URI: http://eprints.soton.ac.uk/id/eprint/19993
PURE UUID: 5cbd2f26-e88d-4617-91ff-b6630d97b053

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Date deposited: 24 Feb 2006
Last modified: 17 Jul 2017 16:29

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Contributors

Author: N. J. Kenyon
Author: M. T. Weller

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