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Er2Mg crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Er atoms. All Mg–Er bond lengths are 3.32 Å. Er is bonded to four equivalent Mg and eight equivalent Er atoms to form a mixture of distorted edge, face, and corner-sharing ErEr8Mg4 cuboctahedra. There are four shorter (3.45 Å) and four longer (3.57 Å) Er–Er bond lengths.
Er2Mg crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Mg is bonded in a 8-coordinate geometry to eight Er atoms. There are a spread of Mg–Er bond distances ranging from 3.30–3.34 Å. There are two inequivalent Er sites. In the first Er site, Er is bonded to six equivalent Mg and six Er atoms to form a mixture of distorted corner, edge, and face-sharing ErEr6Mg6 cuboctahedra. There are a spread of Er–Er bond distances ranging from 3.50–3.60 Å. In the second Er site, Er is bonded to two equivalent Mg and ten Er atoms to form a mixture of distorted corner, edge, and face-sharing ErEr10Mg2 cuboctahedra. There are four shorter (3.36 Å) and two longer (3.60 Å) Er–Er bond lengths.
Er2Mg crystallizes in the orthorhombic Fmmm space group. The structure is three-dimensional. Mg is bonded to four equivalent Mg and eight equivalent Er atoms to form a mixture of distorted corner and face-sharing MgEr8Mg4 cuboctahedra. All Mg–Mg bond lengths are 3.34 Å. There are four shorter (3.32 Å) and four longer (3.80 Å) Mg–Er bond lengths. Er is bonded in a 8-coordinate geometry to four equivalent Mg and six equivalent Er atoms. There are four shorter (3.34 Å) and two longer (3.38 Å) Er–Er bond lengths.