Journal of Materials Science: Materials in Electronics

, Volume 29, Issue 17, pp 14865–14873 | Cite as

The ac conductivity of binary chalcogenide glasses \({\text {Se}}_{100-x}{\text {X}}_{x}\) (X = Ge, In, Te)

  • Ram MurtiEmail author
  • S. K. Tripathi
  • Navdeep Goyal
  • Satya Prakash


The random free energy barrier hopping model is used to investigate the temperature and frequency dependent ac conductivity \(\sigma _{ac}(\omega )\) of binary chalcogenide glasses \({\text {Se}}_{100-x}{\text {X}}_{x}\) (X = Ge, In, Te). The temperature dependent barrier height leads to Meyer–Neldel (MN) rule. The calculated MN energy \(E_{MN}\) is in good agreement with the experimental estimates. The \(\sigma _{ac}(\omega )\) is taken as the sum of bipolaron and single polaron hopping conductivities \(\sigma _{b}(\omega )\) and \(\sigma _{s}(\omega ),\) respectively. The calculated results are in close agreement with the experimental data. It is found that \(\sigma _{s}\) is smaller by orders of magnitude than \(\sigma _{b}\) in \({\text {Se}}_{100-x}{\text {Ge}}_{x}\) alloys in the temperature range 250–400 K, while in \({\text {Se}}_{100-x}{\text {Te}}_{x}\) alloys \(\sigma _{ac}(\omega )\) is mainly due to \(\sigma _{b}\) in the temperature range 150–250 K and \(\sigma _{s}\) becomes significant above 250 K. However in \({\text {Se}}_{100-x}{\text {In}}_{x}\) alloys in the temperature range 303–333 K, \(\sigma _{b}\) is nearly temperature independent and \(\sigma _{ac}(\omega )\) is mainly due to \(\sigma _{s}.\) It is found that acoustic phonons assist hopping process in \({\text {Se}}_{100-x}{\text {Ge}}_{x}\) and \({\text {Se}}_{100-x}{\text {Te}}_{x}\) alloys, while both high energy acoustic and low energy optical phonons assist hopping process in \({\text {Se}}_{100-x}{\text {In}}_{x}\) alloys.



The authors are thankful to Professor G. S. S. Saini and Ms. Swati Khatta for their kind help. The financial support of DST with Grant No. SR/S2/CMP-28/2012 SERB is also acknowledged.


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Centre of Advanced Study in Physics, Department of PhysicsPanjab UniversityChandigarhIndia

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