ABSTRACT
As examples of CMAs, we point to three of the most complicated intermetallic phases, β-Al3Mg2, Cu3Cd4, and NaCd2, all their structures having been solved by Samson in 1960s. ἀ e β-Al3Mg2 compound contains 1168 atoms in the unit cell with clusters characterized by the Friauf polyhedra
with space group Fd m3 [1,2]. According to the phase diagram [3], a solid solution range exists over 37.5 to 40.0 at .%Mg. In the case of Cu3Cd4, there are 1124 atoms in the unit cell with the lattice constant of 2.5871 nm. Its
space group was deduced to be F m43 . Dominant coordination shells in Cu3Cd4 are composed of Friauf polyhedra and icosahedra [4]. ἀ e NaCd2
with space group Fd m3 contains 1120 to 1190 atoms in the unit cell with the lattice constant a = 3.056 nm [5].
