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Dielectric properties of Fe-Sb-S-I chalcogenide glasses

I. O. GÚTH1,* , D. M. PETROVIĆ1, M. V. ŠILJEGOVIĆ1, S. R. LUKIĆ1

Affiliation

  1. Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 4., Novi Sad, Serbia

Abstract

The work presents results of the analysis of dielectric properties of glasses of the type Fex[(Sb2S3)0.75(SbI3)0.25]1-x for atomic contents of iron of 0, 0.1, 0.5, 0.8, 1 and 2 %. The glass with the highest Fe content shows metal-type conductivity, with the dielectric properties of orientational type. For the other glasses, the impedances and angles of dielectric losses were measured in the frequency range from 300 Hz to 100 MHz, and from room temperature to temperature close to the glass transition. Frequency dependence of the real dielectric permittivity and factors of dielectric losses suggest the existence of several dielectric phases. The high-frequency composite dielectric component has a characteristic time of dipolar orientation at the frequencies of the order of 10 kHz. Separation of the components was performed on the basis of determining characteristic parameters from the Cole-Cole diagrams for the high-frequency component. The obtained values for standard dielectric permittivity of the high-frequency composite were in the range between 570 and 660 for the different investigated glasses. The dielectric relaxation times and the corresponding activation energies of dielectric orientations were calculated, and it was found that they show an increase with Fe content (0.01-0.05 eV)..

Keywords

Chalcogenide glasses, amorphous semiconductors, dielectric properties, dielectric permittivity, Fe-Sb-S-I.

Submitted at: Nov. 14, 2006
Accepted at: June 15, 2007

Citation

I. O. GÚTH, D. M. PETROVIĆ, M. V. ŠILJEGOVIĆ, S. R. LUKIĆ, Dielectric properties of Fe-Sb-S-I chalcogenide glasses, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1694-1698 (2007)