First-principles study of electronic and optical properties of cubic AgTaO3 structure in paraelectric phase at different pressures

Abstract

ABSTRACTIn the present article, a theoretical study of structural properties, energy band structure, total (TDOS) and partial (PDOS) density of states, real and imaginary parts of photon frequency dependent complex dielectric function of cubic AgTaO3 in paraelectric phase was presented by ab-initio calculations using DFT-LDA in the ABINIT code. The obtained energy band structure under various pressures shows that AgTaO3 has an indirect band gap at the Γ and M points in the first Brillouin zone which increases by increasing pressure. Calculated results for energy band gap and optical properties under pressure are given and these results were compared with the experimental results and previous calculations.