• Thermal diffusion near glass transition in Ge-Se glasses measured by photoacoustics

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      https://www.ias.ac.in/article/fulltext/pram/032/06/0821-0830

    • Keywords

       

      Thermal diffusivity; glass transition; photoacoustic technique

    • Abstract

       

      The glass transition in GexSe1−x) (0·1 ⩽x ⩽ 0·25) glasses has been investigated using the photoacoustic (PA) technique. It is found that the PA amplitude and phase undergo anomalous changes at the glass transition temperatureTg. The amplitude has critical minimum and phase has maximum values atTg. The variation of the thermal diffusivity, determined by measuring the frequency dependence of the PA amplitude and phase, with temperature shows sharp decrease near the glass transition temperature. The temperature dependence of the optical energy gap also has been measured and it shows a decrease with temperature for all compositions, the rate of decrease being higher for temperatures greater thanTg.

    • 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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