First-principles calculations of electronic, optical and elastic properties of ZnAlS and ZnGaO

M.G. Brik (1)

1 University of Tartu

The optimized crystal structures, band structures, partial and total densities of states (DOS), dielectric functions, refractive indexes and elastic constants for ZnAlS and ZnGaO were calculated using the CASTEP module of Materials Studio package. Pressure effects were modeled by performing these calculations for different values of external hydrostatic pressure up to 50GPa. Obtained dependencies of the unit cell volume on pressure were fitted by the Murnaghan equation of state, and the relative changes of different chemical bond lengths were approximated by quadratic functions of pressure. Variations of applied pressure were shown to produce considerable re-distribution of the electron densities around ions in both crystals, which is evidenced in different trends for the effective Mulliken charges of the constituting ions and changes of contour plots of the charge densities. The longitudinal and transverse sound velocities and Debye temperatures for both compounds were also estimated using the calculated elastic constants.

Mots clés: A. inorganic compounds; C. Ab initio calculations; D. electronic structure

Domaines: Science des matériaux [cond-mat.mtrl-sci]

M.G. Brik. First-principles calculations of electronic, optical and elastic properties of ZnAlS and ZnGaO. Journal of Physics and Chemistry of Solids, 2010, 71 (10), pp.1435. ⟨10.1016/j.jpcs.2010.07.007⟩. ⟨hal-00671933⟩