Last years in Laboratory of Physics of extreme influences on substance of USU the various multicomponents chalkogenides of silver and copper were synthesised and the researches. The large interest the represents are research of properties of these compounds at high and super-high pressure. In the present work were investigated chalkogenides of silver AgPbAsS₃, AgSnAsS₃ and AgSnSbS₃ at pressure 15GPa-50GPa by a method of impedance spectroscopy.
These compounds are mixed electronic-ionic conductors, with low temperatures of a appearance the ionic current. Their research at high pressure represents the large interest and it is necessary for specification of areas of their possible application. For generation of pres-sure up to 50GPa used the carbonado-diamond anvil cell.
Were received the godographs of an impedance of compounds at pressure 15GPa-50GPa and the dependences of conductivity on frequency are investigated. The hysteresis of conductivity is investigated at gradual the unloading a sample. The influence of borders an electrode / sample was analysed at various pressure. From the data of conductivity and tangent of a corner the dielectric losses the region of existence of phase transitions in samples are received. The influence of structure of a sample on its electrical properties at high pressure is analysed . At the analysis of results the contribution of an impedance the anvil in a com-mon impedance was taken into account. For the description of results the circuit was offered, into which the elements describing various processes occurring in a sample (of resistance, capacity, element of a constant phase) were entered.
The researches are executed at partial financial support CRDF (grant No REC-005) and RFBR-URAL (grant No 01-03-96494).

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