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Phonon modes in non-crystalline Lithium, Sodium and their binary alloys

B. Y. THAKORE1,* , S. G. KHAMBHOLJA1, MITESH JOSHI2, A. R. JANI1

Affiliation

  1. Department of Physics, Sardar Patel University, Vallabh Vidyanagar, 388 120, Gujarat, India
  2. Indus Institute of Technology & Engineering, Rancharda, via: Thaltej, Ahmedabad -382 115, Gujarat, India

Abstract

The longitudinal and transverse phonon modes of light weight non-crystalline alkali metals lithium, sodium and their binary alloy systems (viz. Li0.50Na0.50 and Li0.69Na0.31) are studied in terms of the eigen-frequencies of the localized collective excitations using pseudopotential formalism. The self-consistent phonon scheme involving multiple scattering and phonon eigen-frequencies, which are expressed in terms of many-body correlation functions of atoms as well as of inter-atomic potential, have been used. The pair potential is obtained by Wills Harrison (WH) form using model pseudopotential. Local field correlation functions due to Hartree (H), Taylor (T), Ichimaru and Utsumi (IU), Sarkar et al. (S) and Farid et al (F) are used to investigate influence of the screening effects on the vibrational properties. Results for phonon dispersion curves (PDC) are reported which are consistence with available experimental and other theoretical results confirming the applicability of model potential for such studies..

Keywords

Static and vibrational properties, phonon dispersion curves (PDC).

Submitted at: Feb. 14, 2011
Accepted at: March 16, 2011

Citation

B. Y. THAKORE, S. G. KHAMBHOLJA, MITESH JOSHI, A. R. JANI, Phonon modes in non-crystalline Lithium, Sodium and their binary alloys, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 3, pp. 293-301 (2011)