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X-ray and neutron diffraction measurements have shown that Mn2Au is a compound with a tetragonal unit-cell of dimensions a = 3.328 and c = 8.539 Å and that it can be assigned to the same space group as MnAu2, namely I4/mmm (D4h17). The neutron diffraction pattern of 74.2 at.% MnAu can be explained only if the ordered structure of this alloy is identical with that of Mn2Au. Thus the compound Mn3Au apparently does not exist.
Wells et al. (Fri,) studied this question.