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Pramana

, 91:25 | Cite as

Meyer–Neldel energy in Se-based binary and ternary chalcogenide glasses

  • Ram Murti
  • S K Tripathi
  • Navdeep Goyal
  • Satya Prakash
Article
  • 5 Downloads

Abstract

The integral equations for DC conductivity and external conductance for the network of localised states in amorphous solids are solved by iteration method. The random free energy barriers and single polaron hopping model are used to obtain the DC conductivity \(\sigma _{\mathrm {DC}}\) and Meyer–Neldel energy \(E_{\mathrm {MN}}\). The experimental estimates of optical band gap \(E_{\mathrm {g}}\), dielectric function \(\epsilon \), glass transition temperature \(T_{\mathrm {g}}\) and \(\sigma _{\mathrm {DC}}\) are used to calculate \(E_{\mathrm {MN}}\) for Se-based binary and ternary chalcogenide glasses. The calculated values are found to be in agreement with the available experimental data. \(E_{\mathrm {MN}}\) increases with increase of attempt frequency. The true pre-exponential factor \(\sigma _{00}\) is related to \(E_{\mathrm {MN}}\) as \(\ln \sigma _{00}=p-qE_{\mathrm {MN}}\), where p is nearly 7.3 and q is material-dependent. The calculated values of \(E_{\mathrm {MN}}\) and \(\sigma _{00}\) suggest that DC conduction in these chalcogenides is due to acoustic and optical phonon-assisted polaron hopping.

Keywords

Chalcogenide glasses Meyer–Neldel energy DC conductivity defect density polaron hopping band gap 

PACS Nos

71.55.Gs 72.80.Ey 

Notes

Acknowledgements

The authors are thankful to Prof. G S S Saini, Ms Sameeksha Sharma 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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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

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

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