Liquid Ordering
at the KDP {100}-Solution Interface
D. Kaminski, N. Radenovi, M. A. Deij, W. J. P. van Enckevort, and E.
Vlieg
Cryst. Growth & Design 6 (2006) 588-591
Abstract:
We have determined the atomic structure of the KH2PO4 {100} interface
in contact with solution for different pH values. Using X-ray
diffraction data sets both the perpendicular and the lateral ordering
in the solution have been determined. We find two ordered layers, of
which only the first has lateral order. The atoms at the crystal
surface show no relaxation, and the interface structure is the same for
all pH values measured. The first liquid layer appears to be
chemisorbed and compensates a broken hydrogen bond at the surface. This
explains the fact that the {100} face is insensitive to the pH value.