Premium
Periodic antiphase domain structure in the off‐stoichiometric CuAu II phase
Author(s) -
Watanabe D.,
Takashima K.
Publication year - 1975
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/s0021889875011442
Subject(s) - superlattice , electron diffraction , crystallography , stoichiometry , electron microscope , diffraction , condensed matter physics , materials science , phase (matter) , domain (mathematical analysis) , zone axis , crystal structure , optics , chemistry , physics , mathematical analysis , mathematics , organic chemistry
The ordered structures of Cu–Au alloys containing 56 to 65 at.% Au have been investigated by electron diffraction and electron microscopy, using thin foils prepared from bulk specimens. Single‐crystal diffraction patterns taken from specimens in the CuAu II phase region are interpreted basically in terms of the CuAu II‐type structure. In the composition range of 59–63 at.% Au, however, the splitting direction of superlattice reflections at 110 and equivalent positions is not parallel to the [100] direction, but deviates slightly. To explain the deviation of the splitting direction, regular steps have to be introduced into the periodic antiphase domain boundaries of the CuAu II‐type. The high‐resolution electron microscope study has confirmed the existence of the boundary steps.