Abstract
We have studied the high-pressure behavior of the electronic properties of periclase (MgO) using ab initio total energy calculations within the full-potential linearized augmented plane wave method in the framework of the density functional theory. We predict that at zero pressure MgO in the rocksalt structure is a semiconductor with a direct band gap of 5.35eV We show that the material remains a direct band gap semiconductor under pressures up to 100GPa. We report the pressure coefficients and deformation potentials of the three transitions Γ–Γ, Γ–X and Γ–L for the material in question. We also find that the valence band width increases monotonically with increasing pressure suggesting that the rocksalt MgO becomes less ionic under pressure.
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More From: Optik - International Journal for Light and Electron Optics
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