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SmMg 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 Sm atoms. All Mg–Sm bond lengths are 3.33 Å. Sm is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.
SmMg3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 8-coordinate geometry to eight equivalent Mg and six equivalent Sm atoms. All Mg–Mg bond lengths are 3.19 Å. All Mg–Sm bond lengths are 3.69 Å. In the second Mg site, Mg is bonded in a body-centered cubic geometry to four equivalent Mg and four equivalent Sm atoms. All Mg–Sm bond lengths are 3.19 Å. Sm is bonded in a distorted body-centered cubic geometry to fourteen Mg atoms.
SmMg2 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 Sm atoms to form a mixture of face, edge, and corner-sharing MgSm6Mg6 cuboctahedra. All Mg–Mg bond lengths are 3.05 Å. All Mg–Sm bond lengths are 3.58 Å. Sm is bonded in a 12-coordinate geometry to twelve equivalent Mg and four equivalent Sm atoms. All Sm–Sm bond lengths are 3.73 Å.
MgSm2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight Sm atoms. There are a spread of Mg–Sm bond distances ranging from 3.33–3.39 Å. There are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a 12-coordinate geometry to six equivalent Mg and four equivalent Sm atoms. There are two shorter (3.68 Å) and two longer (3.69 Å) Sm–Sm bond lengths. In the second Sm site, Sm is bonded in a 12-coordinate geometry to two equivalent Mg and ten Sm atoms. There are four shorter (3.46 Å) and two longer (3.77 Å) Sm–Sm bond lengths.
SmMg3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are three inequivalent Mg sites. In the first Mg site, Mg is bonded to eight Mg and four equivalent Sm atoms to form distorted MgSm4Mg8 cuboctahedra that share corners with four equivalent SmMg12 cuboctahedra, corners with fourteen MgSm4Mg8 cuboctahedra, edges with six equivalent SmMg12 cuboctahedra, edges with twelve MgSm4Mg8 cuboctahedra, faces with four equivalent SmMg12 cuboctahedra, and faces with sixteen MgSm4Mg8 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.22–3.48 Å. There are two shorter (3.29 Å) and two longer (3.39 Å) Mg–Sm bond lengths. In the second Mg site, Mg is bonded to eight equivalent Mg and four equivalent Sm atoms to form distorted MgSm4Mg8 cuboctahedra that share corners with four equivalent SmMg12 cuboctahedra, corners with fourteen MgSm4Mg8 cuboctahedra, edges with six equivalent SmMg12 cuboctahedra, edges with twelve equivalent MgSm4Mg8 cuboctahedra, faces with four equivalent SmMg12 cuboctahedra, and faces with sixteen MgSm4Mg8 cuboctahedra. There are two shorter (3.29 Å) and two longer (3.39 Å) Mg–Sm bond lengths. In the third Mg site, Mg is bonded to eight equivalent Mg and four equivalent Sm atoms to form distorted MgSm4Mg8 cuboctahedra that share corners with four equivalent SmMg12 cuboctahedra, corners with fourteen MgSm4Mg8 cuboctahedra, edges with six equivalent SmMg12 cuboctahedra, edges with twelve equivalent MgSm4Mg8 cuboctahedra, faces with four equivalent SmMg12 cuboctahedra, and faces with sixteen MgSm4Mg8 cuboctahedra. There are two shorter (3.29 Å) and two longer (3.39 Å) Mg–Sm bond lengths. Sm is bonded to twelve Mg atoms to form SmMg12 cuboctahedra that share corners with six equivalent SmMg12 cuboctahedra, corners with twelve MgSm4Mg8 cuboctahedra, edges with eighteen MgSm4Mg8 cuboctahedra, faces with eight equivalent SmMg12 cuboctahedra, and faces with twelve MgSm4Mg8 cuboctahedra.
MgSm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg is bonded to twelve Sm atoms to form MgSm12 cuboctahedra that share corners with four equivalent MgSm12 cuboctahedra, corners with eight equivalent SmSm8Mg4 cuboctahedra, edges with eight equivalent MgSm12 cuboctahedra, edges with sixteen equivalent SmSm8Mg4 cuboctahedra, faces with four equivalent MgSm12 cuboctahedra, and faces with fourteen SmSm8Mg4 cuboctahedra. There are four shorter (3.51 Å) and eight longer (3.53 Å) Mg–Sm bond lengths. There are two inequivalent Sm sites. In the first Sm site, Sm is bonded to four equivalent Mg and eight equivalent Sm atoms to form SmSm8Mg4 cuboctahedra that share corners with four equivalent SmSm8Mg4 cuboctahedra, corners with eight equivalent MgSm12 cuboctahedra, edges with twenty-four SmSm8Mg4 cuboctahedra, faces with six equivalent MgSm12 cuboctahedra, and faces with twelve SmSm8Mg4 cuboctahedra. All Sm–Sm bond lengths are 3.53 Å. In the second Sm site, Sm is bonded to four equivalent Mg and eight Sm atoms to form SmSm8Mg4 cuboctahedra that share corners with twelve equivalent SmSm8Mg4 cuboctahedra, edges with eight equivalent MgSm12 cuboctahedra, edges with sixteen SmSm8Mg4 cuboctahedra, faces with four equivalent MgSm12 cuboctahedra, and faces with fourteen SmSm8Mg4 cuboctahedra. All Sm–Sm bond lengths are 3.51 Å.
MgSm2 crystallizes in the tetragonal I4/mmm space group. The structure is two-dimensional and consists of two MgSm2 sheets oriented in the (0, 0, 1) direction. Mg is bonded in a body-centered cubic geometry to eight equivalent Sm atoms. All Mg–Sm bond lengths are 3.35 Å. Sm is bonded in a 8-coordinate geometry to four equivalent Mg atoms.
MgSm5 crystallizes in the trigonal R32 space group. The structure is three-dimensional. Mg is bonded to twelve Sm atoms to form MgSm12 cuboctahedra that share corners with six equivalent MgSm12 cuboctahedra, corners with twelve equivalent SmSm9Mg3 cuboctahedra, edges with six equivalent MgSm12 cuboctahedra, edges with twelve SmSm10Mg2 cuboctahedra, and faces with twenty SmSm10Mg2 cuboctahedra. There are six shorter (3.51 Å) and six longer (3.61 Å) Mg–Sm bond lengths. There are six inequivalent Sm sites. In the first Sm site, Sm is bonded to two equivalent Mg and ten Sm atoms to form distorted SmSm10Mg2 cuboctahedra that share corners with eighteen SmSm10Mg2 cuboctahedra, edges with four equivalent MgSm12 cuboctahedra, edges with fourteen SmSm10Mg2 cuboctahedra, faces with four equivalent MgSm12 cuboctahedra, and faces with sixteen SmSm10Mg2 cuboctahedra. There are a spread of Sm–Sm bond distances ranging from 3.51–3.75 Å. In the second Sm site, Sm is bonded to two equivalent Mg and ten Sm atoms to form distorted SmSm10Mg2 cuboctahedra that share corners with eighteen SmSm10Mg2 cuboctahedra, edges with four equivalent MgSm12 cuboctahedra, edges with fourteen SmSm10Mg2 cuboctahedra, faces with four equivalent MgSm12 cuboctahedra, and faces with sixteen SmSm10Mg2 cuboctahedra. There are a spread of Sm–Sm bond distances ranging from 3.51–3.75 Å. In the third Sm site, Sm is bonded to two equivalent Mg and ten Sm atoms to form distorted SmSm10Mg2 cuboctahedra that share corners with eighteen SmSm10Mg2 cuboctahedra, edges with four equivalent MgSm12 cuboctahedra, edges with fourteen SmSm10Mg2 cuboctahedra, faces with four equivalent MgSm12 cuboctahedra, and faces with sixteen SmSm10Mg2 cuboctahedra. There are a spread of Sm–Sm bond distances ranging from 3.51–3.75 Å. In the fourth Sm site, Sm is bonded to three equivalent Mg and nine Sm atoms to form SmSm9Mg3 cuboctahedra that share corners with six equivalent MgSm12 cuboctahedra, corners with twelve equivalent SmSm9Mg3 cuboctahedra, edges with eighteen SmSm10Mg2 cuboctahedra, faces with four equivalent MgSm12 cuboctahedra, and faces with sixteen SmSm10Mg2 cuboctahedra. There are one shorter (3.57 Å) and three longer (3.61 Å) Sm–Sm bond lengths. In the fifth Sm site, Sm is bonded to two equivalent Mg and ten Sm atoms to form distorted SmSm10Mg2 cuboctahedra that share corners with eighteen SmSm10Mg2 cuboctahedra, edges with four equivalent MgSm12 cuboctahedra, edges with fourteen SmSm9Mg3 cuboctahedra, faces with four equivalent MgSm12 cuboctahedra, and faces with sixteen SmSm10Mg2 cuboctahedra. There are two shorter (3.55 Å) and one longer (3.75 Å) Sm–Sm bond lengths. In the sixth Sm site, Sm is bonded to two equivalent Mg and ten Sm atoms to form distorted SmSm10Mg2 cuboctahedra that share corners with eighteen SmSm10Mg2 cuboctahedra, edges with four equivalent MgSm12 cuboctahedra, edges with fourteen SmSm10Mg2 cuboctahedra, faces with four equivalent MgSm12 cuboctahedra, and faces with sixteen SmSm10Mg2 cuboctahedra. Both Sm–Mg bond lengths are 3.51 Å. There are a spread of Sm–Sm bond distances ranging from 3.51–3.75 Å.
MgSm2 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two MgSm2 sheets oriented in the (1, 0, 0) direction. Mg is bonded in a body-centered cubic geometry to eight Sm atoms. There are a spread of Mg–Sm bond distances ranging from 3.35–3.38 Å. There are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a 12-coordinate geometry to four equivalent Mg atoms. In the second Sm site, Sm is bonded in a 12-coordinate geometry to four equivalent Mg atoms.
SmMg5 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are five inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to nine Mg and two equivalent Sm atoms. There are a spread of Mg–Mg bond distances ranging from 3.16–3.32 Å. Both Mg–Sm bond lengths are 3.35 Å. In the second Mg site, Mg is bonded to ten Mg and two equivalent Sm atoms to form distorted MgSm2Mg10 cuboctahedra that share corners with four equivalent MgSm2Mg10 cuboctahedra, corners with four equivalent SmSm2Mg10 cuboctahedra, edges with six equivalent MgSm2Mg10 cuboctahedra, edges with six equivalent SmSm2Mg10 cuboctahedra, faces with two equivalent SmSm2Mg10 cuboctahedra, and faces with eleven MgSm2Mg10 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.15–3.48 Å. Both Mg–Sm bond lengths are 3.33 Å. In the third Mg site, Mg is bonded to ten Mg and two equivalent Sm atoms to form MgSm2Mg10 cuboctahedra that share corners with eight MgSm2Mg10 cuboctahedra, edges with twelve MgSm2Mg10 cuboctahedra, faces with six equivalent SmSm2Mg10 cuboctahedra, and faces with seven MgSm2Mg10 cuboctahedra. There are four shorter (3.25 Å) and two longer (3.33 Å) Mg–Mg bond lengths. Both Mg–Sm bond lengths are 3.39 Å. In the fourth Mg site, Mg is bonded in a 12-coordinate geometry to nine Mg and two equivalent Sm atoms. There are two shorter (3.17 Å) and two longer (3.25 Å) Mg–Mg bond lengths. Both Mg–Sm bond lengths are 3.33 Å. In the fifth Mg site, Mg is bonded to ten Mg and two equivalent Sm atoms to form distorted MgSm2Mg10 cuboctahedra that share corners with eight MgSm2Mg10 cuboctahedra, edges with six equivalent MgSm2Mg10 cuboctahedra, edges with six equivalent SmSm2Mg10 cuboctahedra, faces with three equivalent SmSm2Mg10 cuboctahedra, and faces with ten MgSm2Mg10 cuboctahedra. Both Mg–Mg bond lengths are 3.25 Å. Both Mg–Sm bond lengths are 3.35 Å. Sm is bonded to ten Mg and two equivalent Sm atoms to form SmSm2Mg10 cuboctahedra that share corners with four equivalent MgSm2Mg10 cuboctahedra, corners with four equivalent SmSm2Mg10 cuboctahedra, edges with twelve MgSm2Mg10 cuboctahedra, faces with two equivalent SmSm2Mg10 cuboctahedra, and faces with eleven MgSm2Mg10 cuboctahedra. Both Sm–Sm bond lengths are 3.25 Å.
Mg149Sm is Magnesium-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. there are twenty-seven inequivalent Mg sites. In the first Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgSmMg11 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.20 Å. In the second Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, an edgeedge with one SmMg12 cuboctahedra, edges with seventeen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.22 Å. In the third Mg site, Mg is bonded to eleven Mg and one Sm atom to form MgSmMg11 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, a faceface with one SmMg12 cuboctahedra, and faces with nineteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.14–3.35 Å. The Mg–Sm bond length is 3.27 Å. In the fourth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share a cornercorner with one SmMg12 cuboctahedra, corners with seventeen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are three shorter (3.19 Å) and six longer (3.20 Å) Mg–Mg bond lengths. In the fifth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, an edgeedge with one SmMg12 cuboctahedra, edges with seventeen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.16–3.21 Å. In the sixth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.19–3.21 Å. In the seventh Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, a faceface with one SmMg12 cuboctahedra, and faces with nineteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.24 Å. In the eighth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are three shorter (3.20 Å) and six longer (3.21 Å) Mg–Mg bond lengths. In the ninth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.19–3.23 Å. In the tenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.20 Å. In the eleventh Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.20 Å. In the twelfth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, an edgeedge with one SmMg12 cuboctahedra, edges with seventeen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.20 Å. In the thirteenth Mg site, Mg is bonded to eleven Mg and one Sm atom to form MgSmMg11 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, a faceface with one SmMg12 cuboctahedra, and faces with nineteen MgSmMg11 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.15–3.28 Å. The Mg–Sm bond length is 3.27 Å. In the fourteenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.19–3.21 Å. In the fifteenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.20 Å. In the sixteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share a cornercorner with one SmMg12 cuboctahedra, corners with seventeen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgSmMg11 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.19–3.21 Å. In the seventeenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.19–3.21 Å. In the eighteenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.19–3.21 Å. In the nineteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgSmMg11 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are one shorter (3.18 Å) and two longer (3.19 Å) Mg–Mg bond lengths. In the twentieth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, a faceface with one SmMg12 cuboctahedra, and faces with nineteen MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the twenty-first Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are two shorter (3.20 Å) and four longer (3.21 Å) Mg–Mg bond lengths. In the twenty-second Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are two shorter (3.20 Å) and two longer (3.21 Å) Mg–Mg bond lengths. In the twenty-third Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.21 Å. In the twenty-fourth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. In the twenty-fifth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.20 Å. In the twenty-sixth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. Both Mg–Mg bond lengths are 3.21 Å. In the twenty-seventh Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. Both Mg–Mg bond lengths are 3.20 Å. Sm is bonded to twelve Mg atoms to form SmMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra.