The European Physical Journal B

, Volume 64, Issue 1, pp 35–42 | Cite as

Electronic and optical properties under pressure effect of alkali metal oxides

  • M. Moakafi
  • R. Khenata
  • A. Bouhemadou
  • H. Khachai
  • B. Amrani
  • D. Rached
  • M. Rérat
Article
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Abstract

We report results of first-principles calculations for the electronic and optical properties under pressure effect of Li2O, Na2O, Ki2O and Rb2O compounds in the cubic antifluorite structure, using a full relativistic version of the full-potential augmented plane-wave plus local orbitals (FP-APW+lo) method based on density functional theory, within the local density approximation (LDA) and the generalized gradient approximation (GGA). Moreover, the alternative form of GGA proposed by Engel and Vosko (GGA-EV) is also used for band structure calculations. The calculated equilibrium lattices and bulk moduli are in good agreement with the available data. Band structure, density of states, and pressure coefficients of the fundamental energy gap are given. The critical point structure of the frequency dependent complex dielectric function is also calculated and analyzed to identify the optical transitions. The pressure dependence of the static optical dielectric constant is also investigated.

PACS

71.15.Ap Basis sets 78.40.Fy Semiconductors 78.20.Ci Optical constants 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • M. Moakafi
    • 1
  • R. Khenata
    • 2
  • A. Bouhemadou
    • 3
  • H. Khachai
    • 4
  • B. Amrani
    • 2
  • D. Rached
    • 4
  • M. Rérat
    • 5
  1. 1.Department of Physics, Faculty of ScienceUniversity of ChlefChlefAlgeria
  2. 2.Institute of Science & TechnologieUniversité of MascaraMascaraAlgeria
  3. 3.Department of Physics, Faculty of ScienceUniversity of SetifSetifAlgeria
  4. 4.Department of Physics, Faculty of ScienceUniversity of Sidi-Bel AbbèsSidi-Bel AbbèsAlgeria
  5. 5.Équipe de Chimie PhysiqueIPREM-UMR 5254, Université de PauPauFrance

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