• Computation of collective modes and acoustic investigations at different temperatures of vitrous silica

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      https://www.ias.ac.in/article/fulltext/pram/043/03/0201-0209

    • Keywords

       

      Phonon frequencies; pressure derivatives of elastic constants; longitudinal and transverse Gruneisen’s constants; absorption band

    • Abstract

       

      This paper is mainly concerned with elastic and acoustic properties of vitrous silica besides the computation of phonon frequencies. Thus the phonon frequencies of vitrous silica have been calculated assuming the electronic bulk modulus,Ke, as equal to zero. New equations have been derived to relate the pressure derivatives of second order elastic constants to the acoustic Gruneisen’s parameters using both Bhatia-Singh’s parameters and Schofield’s equations. The calculated longitudinal and transverse Gruneisen’s parameters and the predicted absorption band spectra from Nagendranath’s equation and Bhatia Singh’s parameters are in good agreement with experiment. The calculated mean acoustic mode Gruneisen’s parameter evaluated from the pressure derivative of Nagendranath’s equation is also in good agreement with experiment.

    • Author Affiliations

       

      R V Gopala Rao1 R Venkatesh1

      1. Division of Physical Chemistry, Jadavpur University, Calcutta - 700 032, India
    • Dates

       
  • Pramana – Journal of Physics | News

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