Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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L.Bonafous, C.Bessada, D.Massiot, J.P.Coutures, B.Le Rolland, P.Colombet, '29Si MAS NMR study of Dicalcium Silicate : the structural influence of Sulphate and Alumina Stabilizers.', J. Am. Ceram. Soc. 78 2603-2608 (1995) doi:10.1111/j.1151-2916.1995.tb08029.x

The effect on β-C2S of two stabilizing agents, calcium sulfate and alumina, has been investigated using high-resolution 29Si solid state NMR spectroscopy. Syntheses were achieved via the gel route, wet or dry processes. Room-temperature NMR spectra characteristics were analyzed as a function of the sintering temperature. The incorporation of Al3+ and S6+ ions, which finds expression in a noticeable line broadening, is shown to be effective above 1200°C. The 29Si chemical shift is unchanged upon doping, suggesting a mean SiO4 tetrahedra geometry identical to that in pure β-C2S. General trends on the structure adopted by C2S upon Al3+ and S6+ doping are also discussed.