Study on the Ordered Alloys of Gold-Manganese System by Electron Diffraction, I. Au₃Mn

抄録

The ordered structure of Au₃Mn alloy has been investigated by electron diffraction using oriented, evaporated films. The structure can be thought of as formed from the fundamental face-centred orthorhombic lattice, in which the atoms arrange themselves as in the ordered lattice of Cu₃Au but the first kind of out-of-step periodically occurs along both the x and y directions. In some cases the periods are 1.2 a₁ and 2.2 a₂ respectively, where a₁=4.08Å, a₂=4.05Å, a₃=4.03Å are the lattice constants of the fundamental lattice. Thus, a two-dimensional anti-phase domain structure of a new type takes place, which belongs to the space group P_nnm-D_2h¹² in the idealized case.