Untangling electronic, elastic and bonding properties of the ThGeO4 host material from first principles calculation

  • Chewki Ougherb
  • Tarik Ouahrani
  • Abdel Karim Ferouani
Regular Article
  • 18 Downloads

Abstract

We investigate the electronic, thermodynamic and bonding properties of the ThGeO4 host material by means of pseudo-potential method within the framework of density functional theory. Zircon-type ThGeO4 is found to undergo a pressure-driven phase transition to tetragonal scheelite structure, and beyond to monoclinic fergusonite ones. Emphasis is placed on the trends of the dynamical stability and anisotropic behavior related to structural phase transition. Linear as well as cubic thermal expansion component show a different directional dependence as a function of temperature for the investigated polymorphs of the compound. The origin of the difference in the unit cell expansion is found to be related to the distortion of the ThO8 dodecahedra. The analysis of the non-covalent dispersion of the zircon and scheelite structures reveals a counter-balance between destabilizing interactions due to steric crowding and the current attractive and repulsive ones.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Chewki Ougherb
    • 1
    • 2
  • Tarik Ouahrani
    • 1
    • 2
  • Abdel Karim Ferouani
    • 1
    • 2
  1. 1.Laboratoire de Physique Théorique, Université de TlemcenTlemcenAlgeria
  2. 2.École Supérieure des Sciences Appliquées, B.P. 165TlemcenAlgeria

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