Abstract
Crystal structures of two hexagonal phases in Cu-Sb alloys have been studied by means of X-ray and electron diffraction as well as electron microscopy. A new long period superstructure with space group P6 3 /mmc is found in the range 16-19 at.% Sb ( ε phase), which is essentially an anti-phase modulation derived from the hexagonal ordered structure of the Ni 3 Sn (DO 19 ) type. The super-period of atomic order in the close packed plane is nearly seven times the nearest neighbor distance and decreases with increasing e / a . The image of the super-period is directly observed with an 1 MV electron microscope. A similar long period superstructure is established for the neighboring phase ( ε ') around 21 at.% Sb. The stabilization mechanism of the two superstructures is interpreted in terms of the interaction of the Fermi surface with the super-zone faces.
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