Extent of immiscibility in the ettringite-thaumasite system

S. J. Barnett, D. E. Macphee, N. J. Crammond

Research output: Contribution to journalArticlepeer-review


Solid solutions between thaumasite and the related phase ettringite were prepared and characterised by X-ray diffraction and infrared spectroscopy. A miscibility gap in the solid solution is identified and defined. Crystallographically, the miscibility gap is identified as a gap in the unit cell dimensions of the solid phases formed between c congruent to 20.95 (10.475) and c congruent to 21.3 Angstrom. A combination of quantitative X-ray powder diffraction and infrared spectroscopy enabled us to define the miscibility gap in terms of Al:Si ratio. Ettringite can accept the replacement of 1/2 its Al by Si, while thaumasite tolerates little or no At in its structure. (C) 2003 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)851-855
Number of pages5
JournalCement and Concrete Composites
Publication statusPublished - Dec 2003


Dive into the research topics of 'Extent of immiscibility in the ettringite-thaumasite system'. Together they form a unique fingerprint.

Cite this