Abstract
The e-phase in a Cu-Sb binary alloy (19.5 at.% Sb), which is characterized by a two-dimensionally modulated structure, has been investigated by singlecrystal X-ray diffraction at ambient temperature (290 K). The structure analysis was performed based DP63/mmc on a five-dimensional superspace group -p6 ~mm using occupational and displacive modulation waves. The final agreement factors are Ro = 0.086 and R~ = 0.128 for 54 basic reflections and 75 first-order satellites, respectively. Very weak second-order satellites of kl + k2 type are observed using Cu Ka radiation, but the other type of second-order satellites are too weak to detect in the present investigation. The analysis indicates that mixed occupation of Cu and Sb occurs extensively, contrary to the model from a high-resolution electron microscopy study. With regard to the atomic displacements, the transverse component is larger than the longitudinal component, which is in contrast to the Au-Cd alloy. Crystal data of the basic structure: Mr = 74.90, hexagonal, P63/mmc, a = 2.737 (4), c = 4.320 (2) A, V = 28.03 (6) A 3, Z = 2, Dx = 8.88 Mg m-3, A(Mo Ka) = 0.7107 A, /z(Mo Ka) = 39.2 mm-1, F(000)=66.6, two-dimensional wavevectors k~ = 0.430 (1)(bl + b2), k2 = 0.430 (1)(-bl + 2b2).
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