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), 185-194. (doi:10.1016/S1387-1811(03)00310-X).

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Description/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.

Item Type: Article
Related URLs:
Keywords: cancrinite, calcium, silicate, structure, neutron diffraction bayer process
Subjects: Q Science
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Chemistry
ePrint ID: 19993
Date Deposited: 24 Feb 2006
Last Modified: 27 Mar 2014 18:09
URI: http://eprints.soton.ac.uk/id/eprint/19993

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