Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 53: Nanostructures at surfaces: Dots, particles, clusters III
O 53.9: Vortrag
Donnerstag, 26. März 2009, 17:00–17:15, SCH A215
Modification of SrTiO3 single-crystalline surface after plasma flow treatment — •Alexandr A. Levin1, Nikolay A. Kulagin2, Torsten Weißbach1, Tilmann Leisegang1, Enrico Langer3, and Dirk C. Meyer1 — 1Institut für Strukturphysik, Technische Universität Dresden, 01062 Dresden, Germany — 2Kharkiv National University for Radioelectronics, av. Shakespeare 6-48, 61045 Kharkiv, Ukraine — 3Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany
Surface of pure and transition metal-doped SrTiO3(STO) single crystals before and after hydrogen plasma-flow treatment (energy of 5...20 J/cm2) is investigated by wide-angle X-ray diffraction (WAXRD), fluorescence X-ray Absorption Near Edge Structure (XANES) and scanning electron microscopy (SEM) techniques. Plasma treatment results in the formation of a textured polycrystalline layer at the surface of the single-crystalline samples with different orientation. The formation of the quasi-ordered structures consisting of nanoscale-sized pyramids is observed by SEM. XANES evidences the change of the valency of the part of Ti4+ to Ti3+ due to the plasma treatment. The data obtained together with results of X-ray spectroscopy measurements [1] gives evidences of the change of stoichiometry of the STO samples resulting in a change of their physical properties after plasma treatment [2].
[1] N.A. Kulagin, A.A. Levin, E. Langer, D.C. Meyer, I. Doichinovich, Ya. Purich. Crystallography Reports 53 (N6) (2008) 1061-1067 [2] J.-C. Krupa, N.A. Kulagin. Physics of Laser Crystals. Kluwer Academic Publisher. Brusseles, 2003