EPITAXIAL WATER FILM STRUCTURE ON THE MICA CRYSTAL SURFACE. Metsik, M. S., Kiselev, A. B., Shcherbachenko, L. A., University of Irkutsk, Russia

The Structure model of the water film which is on the surfase of mica crystals has been made and a research of diffraction of low intensity X-radiation in water film with the change of film thickness has been done.

It was found that water film structure is initiated by the net of oxygenous hexagonal rings belonging to the silicon oxigenous tetrahedrons of mica crystal lattice. Due to the geometry of this "drawing" water molecules are fixed by hydrogen bond and form a layer net stretching epitaxially into the depth of the film. The distance between water molecules is 2,6 A which is equal to the distance between oxygen atoms in silicon oxigenous tetrahedrons on the crystal surfase. The next two coordination spheres have radiuses 4.2 and 5.1 A. These theoretical calculation are confirmed by the water film low intensity X-raying.

The appearence of tetrahedron quartz-like structure on the juvenile surfaces was noticed for water films with the thickness of 10-50 mkm. Sphere radiuses of this structure are 2.6; 4.2; 5.0 A. The film structure changes due to the mica surfase field attenuation and phonon influence increase during the time.

So, it was found that the water film structure is realised by hexagonal oxigen rings of silicon-oxygenous tetrahedrons of the mica crystal lattice and looks like a tetrahedron quartz-like package of water molecules and differs from ice structure as well as from volume water sructure.