Electrical properties the five-component chalkogenides of silver

Olga L. Kobeleva 1Viktor B. Zlokazov 1Nina V. Melnikova 1Larisa L. Nugaeva 1Leonid Y. Kobelev 1Yakov L. Kobelev 2

1. Ural State University, Department of Physics, Lenin Av., 51, Ekaterinburg 620083, Russian Federation
2. Russian Academy of Sciences, Ural Division, Institute of Metal Physics, 18 S.Kovalevskaya str., GSP-170, Ekaterinburg 620219, Russian Federation

Abstract

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 AgGePbS3xSe3(1-x) (x=0.3-0.7) were synthesised and their electrical properties by a method impedance spectroscopy are investigated. The compounds with x=0.4-0.7 have grey colour and metal shine, compound with x=0.3 have grey dim colour.
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, which, as follows from the impedance diagrams, belongs to HF, in the field of temperatures 78K-400K. Temperature de-pendencies of conductivity the synthesised compounds have a Arrenius type, that is characteristic for ionic semiconductors.
For x=0.5 the conductivity at T=300K is equal 7.6 mS/m. The conductivity of compounds with x=0.4-0.7 on 1-2 order is less, than for compounds which containing As instead of Pb, is comparable to conductivity AgGeSbS3 and on some orders less, than at AgGeSbSe3. For x=0.3 the conductivity is comparable on size to conductivity AgGeSbSe3. In compounds with x=0.7 at T~420K is observed piroelectric phase transition. All connections are the mixed ionic-electronic conductors with temperature of began the ionic of carry 220K-300K, the share ionic conductivity depends from x (50-99.5%).
It is possible, that other ratio of sulphur and selenium in compounds will result in the further growth of conductivity and downturn of temperatures of a beginning the ionic of carry. Also it will be interesting to investigate copper-containing chalkogenides.
The research was made possible in part by Award CRDF (No. REC-005).

Related papers
  1. Phase transition in five-component chalkogenides (PbSe)x(AgAsSe2)1-x
  2. Phase transitions in multicomponent chalkogenides of silver at high pressure by a method of impedance spectroscopy

Presentation: poster at E-MRS Fall Meeting 2003, Symposium A, by Olga L. Kobeleva
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-25 14:29
Revised:   2009-06-08 12:55
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