STRUCTURAL PECULIARITIES OF MUSCOVITE AND PHLOGOPITE CRYSTALS AT LOW TEMPERATURES. T. E. Moskovskaya, J. G. Timirgaleeva, O. V. Roskin, Irkutsk State University, Irkutsk, RussIa

In mica crystals one can came across great number of water layers and gas-water lenses, in which water films are in special boundary store. A rare possibility of studying the influence of crystals inner active surfaces, bordering on the films on its volume properties, first of all on the electroconductivlty and absorption of electric charges is given.

After the voltage had been supplied to the crystal current of conductivity decreased in time very quickly. It should be mentioned that volume charges were being accumulated electrodes in crystal, forming antifields close on the value to the external field. Having taken out the external field and after sample short circuit depolarization current of reverse direction had been appeared, but the charge absorbed in sample had been flown down for a long time. It gives the reason to state that mica is inhomogeneous greatly. For absorption process division and defining their nature, we used depolarization method at low temperature.

Mica samples were preliminary polarized at room temperature and than were cooled by liquid nitrogen under tensity till 180 K. Having taken out the intensity and making short of electrodes, crystals had been heated till 290 K. One can see on the polarization curve the series of maximum 205, 250, 280 K.

Thus the charge accumulated in crystals in the polarization process is being kept for a long lime cooling as 240 - 230 K, because of the crystalization of water films crystals become electrets.