Computer‐simulated high‐resolution transmission electron microscopy (HRTEM) in tourmaline
作者:
E. A. FERROW,
期刊:
Journal of Microscopy
(WILEY Available online 1995)
卷期:
Volume 177,
issue 1
页码: 68-76
ISSN:0022-2720
年代: 1995
DOI:10.1111/j.1365-2818.1995.tb03534.x
出版商: Blackwell Publishing Ltd
关键词: HRTEM;tourmaline;image simulation;exchange components and fractional atomic coordinates
数据来源: WILEY
摘要:
SummaryThe contrast distributions observed in high‐resolution transmission electron microscopy (HRTEM) images of tourmaline depend on the types and magnitudes of the exchange components present and on the degree of atom overlap along the direction of observation. Furthermore, the fractional atomic coordinates in tourmalines are valid only for the specific specimen refined. These properties make the interpretation of experimental HRTEM images of tourmaline using image simulation if not impossible at least extremely difficult. A correct interpretation of experimental HRTEM images of tourmaline is possible provided the structural refinement data on the same crystal are available. Nevertheless, it is possible to interpret the experimental HRTEM images of tourmaline if the composition of the structural model chosen during image simulations approximates the composition of the specimen studied by electron microscopy. A good control of the composition of the specimen studied and an appropriate choice of a structural model for image simulation are therefore as important as properly controlling specimen thickness, specimen tilt, beam tilt and objective lens defocu
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