Journal of
Engineering and Technology Research

  • Abbreviation: J. Eng. Technol. Res.
  • Language: English
  • ISSN: 2006-9790
  • DOI: 10.5897/JETR
  • Start Year: 2009
  • Published Articles: 184

Full Length Research Paper

Low temperature characteristics of dielectric properties for Tl4S3 layered single crystals

A. M. Badr*, H. A. Elshaikh and I. M. Ashraf
Physics Department, Faculty of Science, South Valley University, Aswan, Egypt.
Email: [email protected]

  • Article Number - 099B3DD10726
  • Vol.3(3), pp. 62-76, March 2011
  •  Accepted: 30 December 2010
  •  Published: 31 March 2011

Abstract

 

The current investigation was fulfilled for insight into the dielectric properties of Tl4S3layered single crystals. The real part of dielectric constant ε׳, imaginary part of dielectric constant ε״, the dissipation factor tan δ and the alternating current conductivity σac were measured in an applied ac electric field of frequencies extending from 2.5 to 50 kHz. These measurements were carried out in low temperatures ranging from 77 to 300 K. In line with the dependencies of these dielectric parameters on frequency and temperature, the dielectric properties of the crystals under investigation were elucidated and analyzed. Furthermore, the ac conductivity was found to obey the power law σac(ω) = Aωs with which the values of s were evaluated to be less than unity in the range 0.77 ≥ s ≥ 0.69. On increasing the conditional working temperature, the exponent s was found to be linearly decreased with a temperature coefficient of about 3.69 x 10-4. However, the resultant data showed that the temperature dependence of ac conductivity follows the Arrhenius relation. Based on this dependence, the impact of temperature on the electrical processes in an applied ac electric field was demonstrated and analyzed. In addition, the activation energy was determined for two temperature phases at all the working frequencies investigated here.

 

Key words: Dielectric properties of layered single crystals, charge transition in chalcogenide semiconductors, electrical conduction in an a.c electric field.

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