Non-anomalous high-resolution imaging of crystalline materials

David J. Smith, L. A. Bursill, G. J. Wood

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Anomalous effects, which result from beams which are kinematically- and dynamically-forbidden under space-group extinction rules, are commonly seen in high-resolution images of many crystalline materials, particularly in thicker regions. Reported examples are first briefly reviewed and it is pointed out that crystal and beam tilt can both be contributory factors. Specific calculations of diffracted wave amplitudes and phases, as well as convergent beam electron diffraction patterns, for rutile (TiO2) crystals illustrate the sources of the anomalous effects, and experimental 500 kV images from SiC (6H polytype), Mo5O14 and TiO2 are presented to demonstrate the extreme image sensitivity to local imaging conditions and to emphasise the importance of accurate beam and crystal tilt when imaging in space-group-forbidden zones.

Original languageEnglish (US)
Pages (from-to)19-31
Number of pages13
JournalUltramicroscopy
Volume16
Issue number1
DOIs
StatePublished - 1985
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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