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MgNd is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Nd atoms. All Mg–Nd bond lengths are 3.36 Å. Nd is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.
NdMg2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Mg is bonded to six equivalent Mg and six equivalent Nd atoms to form a mixture of edge, corner, and face-sharing MgNd6Mg6 cuboctahedra. All Mg–Mg bond lengths are 3.07 Å. All Mg–Nd bond lengths are 3.60 Å. Nd is bonded in a 12-coordinate geometry to twelve equivalent Mg and four equivalent Nd atoms. All Nd–Nd bond lengths are 3.76 Å.
Mg12Nd crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are three inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted q6 geometry to ten Mg and two equivalent Nd atoms. There are a spread of Mg–Mg bond distances ranging from 2.99–3.31 Å. Both Mg–Nd bond lengths are 3.74 Å. In the second Mg site, Mg is bonded in a 10-coordinate geometry to nine Mg and one Nd atom. There are one shorter (3.01 Å) and four longer (3.15 Å) Mg–Mg bond lengths. The Mg–Nd bond length is 3.61 Å. In the third Mg site, Mg is bonded to ten Mg and two equivalent Nd atoms to form a mixture of distorted face, edge, and corner-sharing MgNd2Mg10 cuboctahedra. Both Mg–Mg bond lengths are 3.01 Å. Both Mg–Nd bond lengths are 3.92 Å. Nd is bonded in a 12-coordinate geometry to twenty Mg atoms.
MgNd2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight Nd atoms. There are a spread of Mg–Nd bond distances ranging from 3.34–3.43 Å. There are two inequivalent Nd sites. In the first Nd site, Nd is bonded in a 12-coordinate geometry to six equivalent Mg and four equivalent Nd atoms. There are two shorter (3.74 Å) and two longer (3.76 Å) Nd–Nd bond lengths. In the second Nd site, Nd is bonded in a 12-coordinate geometry to two equivalent Mg and ten Nd atoms. There are four shorter (3.50 Å) and two longer (3.83 Å) Nd–Nd bond lengths.
MgNd2 crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of two MgNd2 sheets oriented in the (0, 1, 0) direction. Mg is bonded in a body-centered cubic geometry to eight equivalent Nd atoms. There are four shorter (3.35 Å) and four longer (3.36 Å) Mg–Nd bond lengths. Nd is bonded in a 8-coordinate geometry to four equivalent Mg atoms.
MgNd5 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. Mg is bonded in a distorted q6 geometry to ten Nd atoms. There are a spread of Mg–Nd bond distances ranging from 3.49–3.60 Å. There are five inequivalent Nd sites. In the first Nd site, Nd is bonded to twelve Nd atoms to form NdNd12 cuboctahedra that share corners with eighteen NdNd12 cuboctahedra, edges with ten NdNd8Mg4 cuboctahedra, and faces with eighteen NdNd12 cuboctahedra. There are a spread of Nd–Nd bond distances ranging from 3.60–3.73 Å. In the second Nd site, Nd is bonded to four equivalent Mg and eight Nd atoms to form a mixture of distorted face, edge, and corner-sharing NdNd8Mg4 cuboctahedra. There are a spread of Nd–Nd bond distances ranging from 3.48–3.70 Å. In the third Nd site, Nd is bonded to two equivalent Mg and ten Nd atoms to form a mixture of face, edge, and corner-sharing NdNd10Mg2 cuboctahedra. There are a spread of Nd–Nd bond distances ranging from 3.58–3.70 Å. In the fourth Nd site, Nd is bonded to two equivalent Mg and ten Nd atoms to form NdNd10Mg2 cuboctahedra that share corners with twelve NdNd10Mg2 cuboctahedra, edges with fifteen NdNd12 cuboctahedra, and faces with eighteen NdNd12 cuboctahedra. There are two shorter (3.70 Å) and two longer (3.74 Å) Nd–Nd bond lengths. In the fifth Nd site, Nd is bonded to two equivalent Mg and ten Nd atoms to form distorted NdNd10Mg2 cuboctahedra that share corners with twelve NdNd10Mg2 cuboctahedra, edges with fifteen NdNd8Mg4 cuboctahedra, and faces with eighteen NdNd12 cuboctahedra. Both Nd–Nd bond lengths are 3.70 Å.
MgNd5 crystallizes in the trigonal R32 space group. The structure is three-dimensional. Mg is bonded to twelve Nd atoms to form MgNd12 cuboctahedra that share corners with six equivalent MgNd12 cuboctahedra, corners with twelve equivalent NdNd9Mg3 cuboctahedra, edges with six equivalent MgNd12 cuboctahedra, edges with twelve NdNd10Mg2 cuboctahedra, and faces with twenty NdNd10Mg2 cuboctahedra. There are six shorter (3.54 Å) and six longer (3.68 Å) Mg–Nd bond lengths. There are five inequivalent Nd sites. In the first Nd site, Nd is bonded to two equivalent Mg and ten Nd atoms to form distorted NdNd10Mg2 cuboctahedra that share corners with eighteen NdNd10Mg2 cuboctahedra, edges with four equivalent MgNd12 cuboctahedra, edges with fourteen NdNd10Mg2 cuboctahedra, faces with four equivalent MgNd12 cuboctahedra, and faces with sixteen NdNd10Mg2 cuboctahedra. There are a spread of Nd–Nd bond distances ranging from 3.57–3.89 Å. In the second Nd site, Nd is bonded to two equivalent Mg and ten Nd atoms to form distorted NdNd10Mg2 cuboctahedra that share corners with eighteen NdNd10Mg2 cuboctahedra, edges with four equivalent MgNd12 cuboctahedra, edges with fourteen NdNd10Mg2 cuboctahedra, faces with four equivalent MgNd12 cuboctahedra, and faces with sixteen NdNd10Mg2 cuboctahedra. There are two shorter (3.57 Å) and two longer (3.63 Å) Nd–Nd bond lengths. In the third Nd site, Nd is bonded to three equivalent Mg and nine Nd atoms to form NdNd9Mg3 cuboctahedra that share corners with six equivalent MgNd12 cuboctahedra, corners with twelve equivalent NdNd9Mg3 cuboctahedra, edges with eighteen NdNd10Mg2 cuboctahedra, faces with four equivalent MgNd12 cuboctahedra, and faces with sixteen NdNd10Mg2 cuboctahedra. There are one shorter (3.63 Å) and three longer (3.68 Å) Nd–Nd bond lengths. In the fourth Nd site, Nd is bonded to two equivalent Mg and ten Nd atoms to form distorted NdNd10Mg2 cuboctahedra that share corners with eighteen NdNd10Mg2 cuboctahedra, edges with four equivalent MgNd12 cuboctahedra, edges with fourteen NdNd9Mg3 cuboctahedra, faces with four equivalent MgNd12 cuboctahedra, and faces with sixteen NdNd10Mg2 cuboctahedra. Both Nd–Mg bond lengths are 3.54 Å. There are a spread of Nd–Nd bond distances ranging from 3.57–3.89 Å. In the fifth Nd site, Nd is bonded to two equivalent Mg and ten Nd atoms to form distorted NdNd10Mg2 cuboctahedra that share corners with eighteen NdNd10Mg2 cuboctahedra, edges with four equivalent MgNd12 cuboctahedra, edges with fourteen NdNd10Mg2 cuboctahedra, faces with four equivalent MgNd12 cuboctahedra, and faces with sixteen NdNd10Mg2 cuboctahedra. There are four shorter (3.58 Å) and two longer (3.89 Å) Nd–Nd bond lengths.
MgNd2 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two MgNd2 sheets oriented in the (1, 0, 0) direction. Mg is bonded in a body-centered cubic geometry to eight Nd atoms. There are a spread of Mg–Nd bond distances ranging from 3.36–3.43 Å. There are two inequivalent Nd sites. In the first Nd site, Nd is bonded in a 4-coordinate geometry to four equivalent Mg atoms. In the second Nd site, Nd is bonded in a 12-coordinate geometry to four equivalent Mg atoms.