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Mathematisch-Naturwissenschaftliche Fakultät - Jahrgang 2009

Titel Atomic-resolution studies of In2O3-ZnO compounds on aberration-corrected electron microscopes
Autor Wentao Yu
Publikationsform Dissertation
Abstract In this work, inversion domain microstructures of In2O3(ZnO)30 compounds were investigated by aberration-corrected Transmission Electron Microscopy (TEM). Both phase contrast and Z-contrast imaging were achieved in [1-100] and [2-1-10] zone axes at atomic resolution. The observed results and conclusions are given in the following.
1. Determination of displacements and the strain field of metal sub-lattice
From contrast maxima in TEM images in [1-100], local lattice distortions at the pyramidal IDBs were observed over 3 - 4 atom columns. Lattice displacements and the strain field of metal sub-lattice in two-dimensions were for the first time visualized and measured using ‘DALI’ algorithm.
The quantified displacements were given by (0.55 ± 0.06, 0.16 ± 0.06) Å. Influences to positions of contrast maxima by variations of specimen thickness, defocus and crystal tilt were discussed in detail and might induce an additional error of max. (0.126 ± 0.067) Å horizontally.
The 2D strain was described as symmetric term ε and anti-symmetric term ω. The diagonal element ε11 of the strain ε exhibits a lattice dilatation of max. (4 ± 0.8)% at the pyramidal IDBs horizontally. The off-diagonal elements of the rotation field ω, proves lattice rotations by (1.9 ± 0.3)º with opposite signs at pyramidal IDBs. The strain exhibits a plane of mirror symmetry through the centre of triangular inversion domains IDBs. more...
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© Universitäts- und Landesbibliothek Bonn | Veröffentlicht: 02.11.2009