• Composition dependence of the energy gap and thermal diffusivity in bulk As-Se glasses

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      https://www.ias.ac.in/article/fulltext/pram/033/06/0705-0712

    • Keywords

       

      Optical energy gap; thermal diffusivity; photoacoustic technique; rigidity percolation

    • Abstract

       

      We have measured the composition dependence of the optical energy gap and thermal diffusivity in bulk AsxSe1−x (0.10⩽x⩽0.50) glasses using photoacoustic technique. The energy gap shows a threshold minimum value and thermal diffusivity has a threshold maximum value at the stoichiometric composition As2Se3 corresponding tox=0.40. The decrease in energy gap is explained on the basis of chemical bonding. It is argued that the threshold percolation of rigidity in the random network is responsible for the peaking of the thermal diffusivity at the stoichiometric composition.

    • Author Affiliations

       

      K N Madhusoodanan1 Jacob Philip1

      1. Department of Physics, Cochin University of Science and Technology, Cochin - 682 022, India
    • Dates

       
  • Pramana – Journal of Physics | News

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