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Bulletin of Materials Science

, Volume 23, Issue 3, pp 233–235 | Cite as

Effect of pressure on the phonon properties of europium chalcogenides

  • U. K. Sakalle
  • P. K. Jha
  • S. P. Sanyal
Article

Abstract

Lattice vibrational properties of europium chalcogenides have been investigated at high pressure by using a simple lattice dynamical model theory viz. the three-body force rigid ion model (TRIM) which includes long range three-body interaction arising due to charge transfer effects. The dispersion curves for the four Eu-chalcogenides agree reasonably well with the available experimental data. Variation of LO, TO, LA and TA phonons with pressure have also been studied at the symmetry points of the brillouin zone (BZ) for Euchalcogenides for the first time by using a lattice dynamical model theory. We have also calculated the one phonon density of states and compared them with the first order Raman scattering results. The calculation of one phonon density of states for Eu-chalcogenides has also been extended up to the phase transition pressure. We observed a pronounced shift in phonon spectrum as pressure is increased.

Keywords

Phonons high pressure phase transition 

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Copyright information

© Indian Academy of Sciences 2000

Authors and Affiliations

  • U. K. Sakalle
    • 1
  • P. K. Jha
    • 2
  • S. P. Sanyal
    • 1
    • 3
  1. 1.Department of PhysicsM.V.M.BhopalIndia
  2. 2.Department of PhysicsThe M.S. University of BarodaVadodaraIndia
  3. 3.Institute of Physics and ElectronicsBhopal UniversityBhopalIndia

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