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Order and Disorder in the Lamellar Hydrated Tetracalcium Monocarboaluminate Compound by Guillaume Renaudin; Michel Francois; Omer Evrard is a Engineering article available to read on EtoBox.

What is Order and Disorder in the Lamellar Hydrated Tetracalcium Monocarboaluminate Compound about?

A single crystal X-ray diffraction study was performed on the cementitious phase 3CaO • Al 2 O 3 •CaCO 3 • 11H 2 O (C 4 ACH 11 using cement chemistry shorthand) prepared by hydrothermal synthesis. This layered compound crystallizes with pseudohexagonal symmetry (centrosymmetric space group P1) with parameters a ϭ 5.7422(4) Å, b ϭ 5.7444(4), c ϭ 15.091(3) Å, ␣ ϭ 92.29(1) Њ , ␤ ϭ 87.45(1) Њ , ␥ ϭ 119.55(1), Dx ϭ 2.182 g/cm 3 , and F(000) ϭ 294. Refinement of 1444 independent reflections led to a residual factor R of 0.0468. The structure is disordered; the carbonate group and three of the five water molecules in the interlayer are distributed statistically among general positions. Where the carbonate group is absent, its O-atoms are replaced by three water molecules. The structure is built by stacking of slabs parallel to (001 Hydrogen atoms of the three disordered water molecules are not localized. This structure is the second modification found for this AFm phase. The first, completely ordered in the noncentrosymmetric space group P1, was described previously. The two modifications, the ordered called "O-C 4 ACH 11 " and the disordered called "D-C 4 ACH 11 ", are compared.

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Author

Guillaume Renaudin; Michel Francois; Omer Evrard

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-8846)

Published

1999

Language

EN

Field

Engineering (Physical Sciences)