Effect of pressure on the phonon properties of europium chalcogenides

Bulletin of materials science

P K Jha¹  U K Sakalle²  S P Sanyal³ 

[1] Department of Physics, The M.S. University of Baroda, Vadodara 390 002, India$$Department of Physics, The M.S. University of Baroda, Vadodara 390 002, IndiaDepartment of Physics, The M.S. University of Baroda, Vadodara 390 002, India$$;Department of Physics, M.V.M., Bhopal 462 001, India$$Department of Physics, M.V.M., Bhopal 462 001, IndiaDepartment of Physics, M.V.M., Bhopal 462 001, India$$;Institute of Physics and Electronics, Bhopal University, Bhopal 462 026, India$$Institute of Physics and Electronics, Bhopal University, Bhopal 462 026, IndiaInstitute of Physics and Electronics, Bhopal University, Bhopal 462 026, India$$

关键词: Phonons;    high pressure;    phase transition.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown