# Stability of Monosulfate in the Presence of Iron

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Monosulfate (3CaO·(Al x Fe1x )2O3·CaSO4·12H2O) is an AFm phase that can be formed during the hydration of cement. Fe‐containing monosulfate and (Al,Fe) mixed monosulfate were synthesized and characterized. Fe‐monosulfate is composed of a positively charged main layer [Ca2Fe(OH)6]+ and a negatively charged interlayer [1/2SO4·3H2O], crystallizes in the trigonal $\mathbit{R}\overline{\mathbf{3}}$ symmetry, and is isotypic with Al‐monosulfate. The solubility product at 25°C was determined to be −31.57. The formation of solid solution due to AlFe substitution in the main layer structure of monosulfate was observed. Based on the evolution of the unit cell parameters and the thermodynamic investigations, a presence of solid solution from 0.0 to 0.45 Al/(Al + Fe) ratio and a miscibility gap in the range 0.45 < Al/(Al + Fe) ratio <0.95 is suggested.
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Document Type: Research Article

Publication date: October 1, 2012

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