The structure of interlayer water in a hydrated 2:1 clay

Neutron diffraction in conjunction with substitution of deuterium (D) for hydrogen (H) has been used to study the structure of water in a hydrated crystal of Ni-vermiculite. The intensities of the (00 l) Bragg reflections were measured as a function of the H/D content, up to l=30. Difference analysi...

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Bibliographic Details
Published in:Chemical physics letters 1990-02, Vol.166 (2), p.141-145
Main Authors: Skipper, N.T., Soper, A.K., McConnell, J.D.C., Refson, K.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Inorganic compounds
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary:Neutron diffraction in conjunction with substitution of deuterium (D) for hydrogen (H) has been used to study the structure of water in a hydrated crystal of Ni-vermiculite. The intensities of the (00 l) Bragg reflections were measured as a function of the H/D content, up to l=30. Difference analysis was then used to obtain separate density profiles, ϱ( z), for the hydrogen and the oxygen plus the clay sheets. We have confirmed the existence of interlayer Ni 2+ (H 2O) 6 complexes, in which the water molecules are strongly hydrogen bonded to the surface. More importantly, we have found that within the limits of the experiments all the additional water is located near the hexagonal rings of SiO 4 and AlO 4 − tetrahedra, which comprise the surface.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(90)87267-U