Study on the Ordered Phases with Long Period in the Gold-Zinc Alloy System : II. Structure Analysis of Au_3Zn[R_1], Au_3Zn[R_2] and Au_<3+>Zn

Crystal structures of the ordered phases, Au_3Zn[R_1], Au_3Zn[R_2] and Au_Zn are investigated by X-ray diffraction using single crystals. The structure models proposed by Wilkens and Schubert for Au_3Zn[R_2] and Au_Zn are confirmed substantially, but partly corrected. The structure analysis of a new phase Au_3Zn[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_3Zn[R_1] and Au_3Zn[R_2] take place also in Au_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_3Cd, Ag_3Mg, Cu_3Pd, CuAu II