Study on the Ordered Alloys of Gold-Manganese System by Electron Diffraction, III. Lattice Modulation in the Ordered Au₃Mn

Abstract

In the present paper, some discussion is given of the nature of the lattice modulation which is believed to cause the satellites to flank main reflections in electron diffraction patterns of the ordered Au₃Mn alloy and also in the case of CuAu (II) as well as of Cu₃Pd. Two types of modulation, i.e. a periodic change of lattice spacing and of scattering factor, are considered. It is pointed out that the valence electron may play an important rôle for the lattice modulation. In order to clarify this problem, a detailed X-ray study will be necessary.