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High‐voltage, high‐resolution electron microscopy of Au–Cd alloys. III. One‐dimensional long‐period superstructure of DO 23 type
Author(s) -
Hiraga K.,
Shindo D.,
Hirabayashi M.
Publication year - 1981
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889881009096
Subject(s) - superstructure , electron microscope , lattice constant , alloy , materials science , cathode ray , electron diffraction , crystallography , electron , chemistry , condensed matter physics , optics , diffraction , physics , metallurgy , thermodynamics , quantum mechanics
A one‐dimensional long‐period superstructure (1 d − LPS) of Au–24 at.% Cd alloy has been investigated at the atomic level with a 1 MV electron microscope. Simple images interpretable in terms of the 1 d − LPS of DO 23 type are observed; the cadmium atom positions appear as a regular out‐of‐step configuration of bright dots with the spacing of the lattice constant (4.1 Å) of the basic f.c.c. cell. This is called a superstructure image. The formation of the superstructure image is studied as functions of specimen thickness and defocus on the basis of n ‐beam multislice calculations.