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

Gopala Rao, R. V. ; Venkatesh, R. (1994) Computation of collective modes and acoustic investigations at different temperatures of vitrous silica Pramana - Journal of Physics, 43 (3). pp. 201-209. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/43/3/201-20...

Related URL: http://dx.doi.org/10.1007/BF02847944

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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Phonon Frequencies; Pressure Derivatives of Elastic Constants; Longitudinal and Transverse Gruneisen's Constants; Absorption Band
ID Code:23944
Deposited On:01 Dec 2010 12:52
Last Modified:17 May 2016 07:43

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