Study on the Ordered Phases with Long Period in the Gold-Zinc Alloy System II. Structure Analysis of Au 3 Zn[R 1 ], Au 3 Zn[R 2 ] and Au 3+ Zn

Crystal structures of the ordered phases, Au 3 Zn[R 1 ], Au 3 Zn[R 2 ] and Au 3+ Zn are investigated by X-ray diffraction using single crystals. The structure models proposed by Wilkens and Schubert for Au 3 Zn[R 1 ] and Au 3+ Zn are confirmed substantially, but partly corrected. The structure analysis of a new phase Au 3 Zn[R 1 ] is given, and the stacking faults present in this phase is investigated. It is suggested that the complicated atom shifts similar to those in Au 3 Zn[R 1 ] and Au 3 Zn[R 2 ] take place also in Au 3+ Zn. It is proposed that such complicated atom shifts seem to be a phenomenon not peculiar to the ordered phases in the Au-Zn alloy system but common to the ordered phases with long periods, such as Au 3 Cd, Ag 3 Mg, Cu 3 Pd, CuAu II.