SURFACE ACTIVITY AND AND DIELECTRIC PROPERTIES OF FOLIATED SILICATES. O.V. Roskin, T.E. Moskovskaya, G.T. Timoshenko, Irkutsk State University, Irkutsk, Russia

Dispersed mica is a good object for absorption study of water molecules on the mechanically activated particle surface. Electric properties of the studied samples depend on particle size distribution of powders and are basically, defined by the properties of thin water layers surrounding mica capsule.

Low-frequency dielectric measurement under high dielectric inhomogeneity allow to define the influence of interlayer polarization as well as analyse absorption phenomena taking place in the samples when an external constant electric field acts in the temperature range from 295 K to 430 K.

It has been found out:

1) the smaller particles the shorter of the low-frequency polarization relaxation, but dielectric permeability and angle tangent of the dielectric losses are increasing. These characteristics under normalization of powders damping can be used for the estimation of the particle size distribution;

2) when temperature is increasing angle tagent maximum of the dielectric losses is shifting to the lower frequencies region;

3) damped powders treatment is a constant electric field under 500 V/mm voltage leads to the increase of absorption ability of the investigated samples. Powder is able to hold water films for more a long time. Dielectric losses are essentially decrease. When electric field sign is changing, dielectric characteristics are practically coming back to the basic ones.