Radiation defects on SrTiO3 polar and nonpolar surfaces

Arvids Stashans; Sheyla Serrano; Juan Ortiz

doi:10.1117/12.515662

8 August 2003 Radiation defects on SrTiO₃ polar and nonpolar surfaces

Arvids Stashans, Sheyla Serrano, Juan Ortiz

Proceedings Volume 5122, Advanced Organic and Inorganic Optical Materials; (2003) https://doi.org/10.1117/12.515662
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

Using the INDO quantum-chemical computational method we focus on oxygen-vacancy and F center defects on the non-polar (001) and polar (110) SrTiO₃ surfaces considering both cubic and tetragonal lattices of the material. The results obtained for the lattice relaxation around the defects on the polar (110) surface point to the significant role of the Coulomb interaction in this semi-ionic material. However, in the case of the oxygen vacancies the analysis of the electronic density redistribution leads to the conclusion that these defects make material more covalent due to the stronger hybridization between the O 2p and Ti 3d states. Wave functions of the F centers are found on the two defect-closest Sr atoms in an agreement with the available scanning microscopy and spectroscopy data and pointing to localization of two electrons within the O vacancy region. The analysis of the properties of O vacancies and F centers on the non-polar (001) surface points to somewhat different pattern. In particular, the wave functions of the F centers are found on the defect-nearest Ti atoms and are rather extended. One of the absorption energies obtained by the ΔSCF method matches the experimentally observed value of 2.1 eV found in fast-electron irradiation of strontium titanate.

Citation Download Citation

Arvids Stashans, Sheyla Serrano, and Juan Ortiz "Radiation defects on SrTiO₃ polar and nonpolar surfaces", Proc. SPIE 5122, Advanced Organic and Inorganic Optical Materials, (8 August 2003); https://doi.org/10.1117/12.515662

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