Investigation of Structural, Electrical and Optical Properties of BaZrO3 with Density Functional Theory

Document Type : Research Article

Authors

Department of Physics, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, I.R. IRAN

Abstract

In this research, we investigated the structural, electronic and optical properties of BaZrO3 ceramics and the effects of pressure on these properties were studied. The calculations have been performed by Full Potential Linearized Augmented Plane Wave (FP-LAPW) method in the framework of density functional theory and we used WIEN2k and Quantum Espresso packages. The exchange and correlation potential terms are calculated by LDA, PBE, PB Esol, GGA-WC, GGA+U, modified Becke–Johnson (mBJ) and GG Am BJ+U approximations. The calculated band gap for BaZrO3with the best approximation GG Am BJ+U shows that there is an indirect band gap at the Γ-L direction that it is equal to 5.30eV, so BaZrO3 is an insulator. The results of the band structure and the dielectric function show that the next probable transitions appear at W-L, Γ- Γ and K-K directions and by calculation of density of states we find that p orbital of O atom possesses the majority of contributions in the valence band and at the top of the conduction band, 3d orbitals of Ba and Zr atoms have the dominant contribution. This compound has low compressibility and high hardness. The maximum of absorption, the minimum of reflection and the Plasmon peak occur when the energy of photons is 20.53 eV.

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References

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