Regensburg 2010 – wissenschaftliches Programm

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KR: Fachverband Kristallographie

KR 3: Poster: Crystallography in Nanoscience

KR 3.5: Poster

Mittwoch, 24. März 2010, 15:00–17:30, Poster A

Oxygen vacancy contribution on Anisotropic Anomalous Scattering of rutile TiO₂ — •Carsten Richter¹, Matthias Zschornak¹, Hartmut Stöcker¹, Tilmann Leisegang¹, Dmitri Novikov², and Dirk C. Meyer³ — ¹Nachwuchsgruppe Nanostrukturphysik, Institute of Structural Physics, TU Dresden, Germany — ²Hamburger Synchrotronstrahlungslabor HASYLAB at DESY, 22603 Hamburg, Germany — ³Institute of Experimental Physics, TU Bergakademie Freiberg, Germany

The unique potential of Anisotropic Anomalous Scattering (AAS) for investigation of randomly distributed point defects has been discussed theoretically by Dmitrienko and Ovchinnikova [1]. Here, we use this approach to study influences of oxygen vacancies in rutile TiO₂ on the resonant scattering contributions at the Ti-K absorption edge. First energy dependent AAS experiments have been performed on a series of single crystal wafers with different oxygen concentrations obtained by annealing at a temperature of 800 ^∘C in a vacuum of about 10⁻⁶ mbar for different durations. Measurements were carried out at DESY/HASYLAB on ’forbidden’ 001 and allowed 111 reflections. An interpretation based on vacancy-induced static Ti displacements from high- to low-symmetry positions will be presented.

[1]*V.E. Dmitrienko, E.N.Ovchinnikova: Acta Cryst. A56 (2000) 340-347.