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First Principles Studies on the Electronic Structure and Band Structure of Paraelectric SrTiO3 by Different Approximations

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DOI: 10.4236/jmp.2011.29111    7,190 Downloads   13,492 Views   Citations
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ABSTRACT

The electronic structure, energy band structure, total density of states (DOS) and electronic density of perovskite SrTiO3 in the cubic phase are calculated by the using full potential-linearized augmented plane wave (FP-LAPW) method in the framework density functional theory (DFT) with the generalized gradient approximation (GGA) by WIEN2k package. The calculated band structure shows a direct band gap of 2.5 eV at the Γ point in the Brillouin zone.The total DOS is compared with experimental x-ray photoemission spectra. From the DOS analysis, as well as charge-density studies, I have conclude that the bonding between Sr and TiO2 is mainly ionic and that the TiO2 entities bond covalently.The calculated band structure and density of state of SrTiO3 are in good agreement with theoretical and experimental results.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

H. Salehi, "First Principles Studies on the Electronic Structure and Band Structure of Paraelectric SrTiO3 by Different Approximations," Journal of Modern Physics, Vol. 2 No. 9, 2011, pp. 934-943. doi: 10.4236/jmp.2011.29111.

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