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Journal of Electron Microscopy 50:443-446 (2001)
© 2001 Oxford University Press

Paper

Identification of various phases in HRTEM images of MgO-PSZ

Zongwen Liu, and Alan E. C. Spargo

Department of Mining, Minerals and Material Engineering, University of Queensland, Brisbane 4072, Australia
Present address: Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
School of Physics, University of Melbourne, Victoria 3010, Australia

Magnesia partially stabilized zirconia (MgO-PSZ) is one of the most commonly used engineering ceramics based on zirconia. A detailed discussion about how to identify the various phases in high-resolution transmission electron microscopy images of this material is presented. It shows that in some cases, standard procedures of image simulation are inadequate to interpret these images. By including the effect of astigmatism in both experimental and simulated images, together with the digital Fourier transforms of the images, orthorhombic ZrO2 in [001] orientation was identified. The {delta}-phase, which has a marked effect on the thermomechanical properties of MgO-PSZ, can most easily be identified by high-resolution imaging in the [130]c zone that coincides with a low-index zone axis of the {delta}-phase.

Keywords     high-resolution transmission electron microscopy, electron diffraction, zirconia, phase transformation, Fourier transform, image simulation


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