Electron-optical imaging of Ti6O11at 1·6 Å point-to-point resolution
- 1 December 1978
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 38 (6) , 673-689
- https://doi.org/10.1080/01418617808239263
Abstract
Image-matching techniques are used to demonstrate that point-to-point resolutions of better than 1·7 A have been obtained for Ti6O11 using ultra-high-resolution objective lens pole-pieces and a specially constructed goniometer. However, it is important to distinguish between instrumental and structure image resolution. Whereas the former may be as low as 1·6 Å, the latter is approximately 2·8 Å for C8 = 0·7 mm at 100 kV. It is shown that to take advantage of 1·6 Å instrumental resolution and obtain useful defect structure information, lengthy calculations and demanding experimental requirements must be met. On the other hand, 2·8 Å structure imaging is far less demanding experimentally (focused illumination may be used for example) and the truncated projected-charge-density approximation may be used, at least in the preliminary stages of defect-structure refinement.Keywords
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