X-ray analysis of polycrystals is employed for investigating the effect of isomorphic replacement of manganese by copper in the Еr(Mn$_{1-x}$Cu$_{x}$)$_2$ system on the stability of the hexagonal, densely-packed Cl4 structure. It is established that isomorphic replacement of manganese by copper destabilizes the Cl4 structure and results in the formation of deformation and twinning type packing defects. The concentration of packing of both types for Intermetallic compounds of both types is determined experimentally.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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