Abstract
THE compound Ca2Al(OH)7.3H2O, or 4CaO.Al2O3.13H2O, and several of the many related basic salts, are important because they are formed on hydration of cements1. These substances form platey crystals, which are hexagonal or pseudohexagonal, with (0001) cleavage. The unit cells of some are known, but no crystal structures have been determined. This can be attributed, at least in part, to the poor quality of the crystals, which are rarely more than 100μ across and a few microns thick, and which often show disorder in both orientation and stacking
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References
Turiziani, R., in The Chemistry of Cements (edit. by Taylor, H. F. W.), 1, 233 (Academic Press, London, 1964).
Kuzel, H-J., N. Jb. Miner. Mh., 7, 193 (1966).
Arndt, U. W., North, A. C. T., and Phillips, D. C., J. Scient. Instrum., 41, 421 (1964).
Buttler, F. G., Dent Glasser, L. S., and Taylor, H. F. W., J. Amer. Ceram. Soc., 42, 121 (1959).
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AHMED, S., TAYLOR, H. Crystal Structures of the Lamellar Calcium Aluminate Hydrates. Nature 215, 622–623 (1967). https://doi.org/10.1038/215622a0
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DOI: https://doi.org/10.1038/215622a0
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