Uzhhorod National University 54, Voloshin str., 88000 Uzhhorod, Ukraine E-mail: crystal_lab457@yahoo.com

Abstract. For the first time, the energy band structure, total and partial densities of states of Ag8GeS6 crystal were calculated using the ab initio density functional method in LDA and LDA+U approximations. Argyrodite is direct-gap semiconductor with the calculated band gap width Egd = 1.46 eV in the LDA+U approximation. The valence band of argyrodite contains four energy separated groups of occupied subzones. The unique feature of electron-energy structure of Ag8GeS6 crystal is the energy overlapping between the occupied d-states of Ag atoms and the delocalized valence p-states of S atoms in relatively close proximity to the valence band top.

Keywords: argyrodite, electronic structure, density of states, density functional theory, spatial distribution of valence charge, chemical bond.

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