The development of modern crioelectronic requires the creation of new the semiconductors materials, including materials, which to combine the superionic properties at low temperatures with other properties (optical, magnetic et al). In USU the five-component chalkogenides (PbSe)_x(AgAsSe₂)_1-x (х=0.4-0.9) were synthesised and their electrical properties by a method impedance spectroscopy are investigated.

The compound with х=0.4 has grey dim colour, with other values х - metal shine. On the data of x-rays analysis, the compound consist of two phases - PbSe and AgAsSe₂.

Godographs of an impedance are characterised by presence of two precisely divided areas - low-frequency (electrode processes) and high-frequency (processes in volume of a sample). Researches were carried out on frequency 1592Hz in the field of temperatures 78К-400К.

The property of compound is exchange in depending on a part of phases. For х=0.4 and 0.5 the change a conductivity with metal on semiconductor type in the regions of temperatures 220K and 300К accordingly is observed . For other values х we have the semiconductor type of temperature dependence of conductivity in all investigated interval of temperatures .

This work in part was supported by CRDF (grant EK-005-X1) and grant CRDF and Min. of Education of the Russian Federation (Post Doctoral Fellowship, award EK-005-X1, annex 07, No Y1-E-05-09), and grant RFBR (No 06-02-16492-a)

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