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Exit Wave Reconstruction and Elemental Mapping of Twin Boundaries in the System Zno - Ga2O3

Published online by Cambridge University Press:  02 July 2020

J. Barf ,
T. Walther ,
A. Steinecker  and
W. Mader
J. Barf
Affiliation:
Institut für Anorganische Chemie, Universität Bonn, 53117, Bonn, Germany
T. Walther
Affiliation:
Institut für Anorganische Chemie, Universität Bonn, 53117, Bonn, Germany
A. Steinecker
Affiliation:
Institut für Anorganische Chemie, Universität Bonn, 53117, Bonn, Germany
W. Mader
Affiliation:
Institut für Anorganische Chemie, Universität Bonn, 53117, Bonn, Germany
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Abstract

Polycrystalline ZnO was sintered with 5 mol.% Ga2O3 at 1350°C for lhour in air. Samples for transmission electron microscopy (TEM) were prepared by cold pressing, grinding, dimpling and Argon ion-milling.

ZnO crystallizes in the hexagonal wurtzite structure. Bright field and dark field images reveal lamellar defect structures which are not observed in undoped ZnO. Electron diffraction shows that the lamellar regions consist of heavily twinned ZnO. The twin boundaries (TB) of both twin variants are parallel to lattice planes of type { }. Lattice images along reveal narrow planar twin boundaries as well as a diffuse image contrast within the twin lamellae (Fig. la). to characterize the nature of the boundaries we recorded dark field images of the twinned regions using reflections of type ±{0002}. in combination with microdiffraction it can be shown that the diffuse boundaries are inversion domain boundaries (IDB) which alternate with the sharp TB. This microstructure is related to the polarity of ZnO.

Type
Quantitative Transmission Electron Microscopy of Interfaces (Organized by M. Rüehle, Y. Zhu and U. Dahmen)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 290 - 291
Copyright
Copyright © Microscopy Society of America 2001

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References

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