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MgPm2 crystallizes in the tetragonal I4/mmm space group. The structure is two-dimensional and consists of two MgPm2 sheets oriented in the (0, 0, 1) direction. Mg is bonded in a body-centered cubic geometry to eight equivalent Pm atoms. All Mg–Pm bond lengths are 3.36 Å. Pm is bonded in a 8-coordinate geometry to four equivalent Mg atoms.
MgPm5 crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Mg is bonded in a 10-coordinate geometry to ten Pm atoms. There are a spread of Mg–Pm bond distances ranging from 3.47–3.61 Å. There are five inequivalent Pm sites. In the first Pm site, Pm is bonded to twelve Pm atoms to form PmPm12 cuboctahedra that share corners with eighteen PmPm12 cuboctahedra, edges with ten PmPm10Mg2 cuboctahedra, and faces with eighteen PmPm12 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.56–3.73 Å. In the second Pm site, Pm is bonded to four equivalent Mg and eight Pm atoms to form a mixture of distorted corner, edge, and face-sharing PmPm8Mg4 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.47–3.71 Å. In the third Pm site, Pm is bonded to two equivalent Mg and ten Pm atoms to form a mixture of corner, edge, and face-sharing PmPm10Mg2 cuboctahedra. There are four shorter (3.54 Å) and two longer (3.71 Å) Pm–Pm bond lengths. In the fourth Pm site, Pm is bonded to two equivalent Mg and ten Pm atoms to form distorted PmPm10Mg2 cuboctahedra that share corners with twelve PmPm10Mg2 cuboctahedra, edges with fifteen PmPm12 cuboctahedra, and faces with eighteen PmPm12 cuboctahedra. All Pm–Pm bond lengths are 3.71 Å. In the fifth Pm site, Pm is bonded to two equivalent Mg and ten Pm atoms to form distorted PmPm10Mg2 cuboctahedra that share corners with twelve PmPm10Mg2 cuboctahedra, edges with fifteen PmPm8Mg4 cuboctahedra, and faces with eighteen PmPm12 cuboctahedra. Both Pm–Pm bond lengths are 3.71 Å.
MgPm 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 Pm atoms. All Mg–Pm bond lengths are 3.34 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.
MgPm2 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two MgPm2 sheets oriented in the (1, 0, 0) direction. Mg is bonded in a body-centered cubic geometry to eight Pm atoms. There are a spread of Mg–Pm bond distances ranging from 3.36–3.40 Å. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded in a 4-coordinate geometry to four equivalent Mg atoms. In the second Pm site, Pm is bonded in a 12-coordinate geometry to four equivalent Mg atoms.
Mg3Pm 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 Pm atoms. All Mg–Mg bond lengths are 3.20 Å. All Mg–Pm bond lengths are 3.70 Å. In the second Mg site, Mg is bonded in a body-centered cubic geometry to four equivalent Mg and four equivalent Pm atoms. All Mg–Pm bond lengths are 3.20 Å. Pm is bonded in a distorted body-centered cubic geometry to fourteen Mg atoms.
MgPm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg is bonded to twelve Pm atoms to form MgPm12 cuboctahedra that share corners with four equivalent MgPm12 cuboctahedra, corners with eight equivalent PmPm8Mg4 cuboctahedra, edges with eight equivalent MgPm12 cuboctahedra, edges with sixteen equivalent PmPm8Mg4 cuboctahedra, faces with four equivalent MgPm12 cuboctahedra, and faces with fourteen PmPm8Mg4 cuboctahedra. All Mg–Pm bond lengths are 3.54 Å. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Mg and eight equivalent Pm atoms to form PmPm8Mg4 cuboctahedra that share corners with four equivalent PmPm8Mg4 cuboctahedra, corners with eight equivalent MgPm12 cuboctahedra, edges with twenty-four PmPm8Mg4 cuboctahedra, faces with six equivalent MgPm12 cuboctahedra, and faces with twelve PmPm8Mg4 cuboctahedra. All Pm–Pm bond lengths are 3.54 Å. In the second Pm site, Pm is bonded to four equivalent Mg and eight Pm atoms to form PmPm8Mg4 cuboctahedra that share corners with twelve equivalent PmPm8Mg4 cuboctahedra, edges with eight equivalent MgPm12 cuboctahedra, edges with sixteen PmPm8Mg4 cuboctahedra, faces with four equivalent MgPm12 cuboctahedra, and faces with fourteen PmPm8Mg4 cuboctahedra. All Pm–Pm bond lengths are 3.54 Å.
Mg3Pm 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 Pm atoms to form distorted MgPm4Mg8 cuboctahedra that share corners with four equivalent PmMg12 cuboctahedra, corners with fourteen MgPm4Mg8 cuboctahedra, edges with six equivalent PmMg12 cuboctahedra, edges with twelve MgPm4Mg8 cuboctahedra, faces with four equivalent PmMg12 cuboctahedra, and faces with sixteen MgPm4Mg8 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.23–3.48 Å. There are two shorter (3.29 Å) and two longer (3.39 Å) Mg–Pm bond lengths. In the second Mg site, Mg is bonded to eight Mg and four equivalent Pm atoms to form distorted MgPm4Mg8 cuboctahedra that share corners with four equivalent PmMg12 cuboctahedra, corners with fourteen MgPm4Mg8 cuboctahedra, edges with six equivalent PmMg12 cuboctahedra, edges with twelve MgPm4Mg8 cuboctahedra, faces with four equivalent PmMg12 cuboctahedra, and faces with sixteen MgPm4Mg8 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.23–3.48 Å. There are two shorter (3.29 Å) and two longer (3.39 Å) Mg–Pm bond lengths. In the third Mg site, Mg is bonded to eight Mg and four equivalent Pm atoms to form distorted MgPm4Mg8 cuboctahedra that share corners with four equivalent PmMg12 cuboctahedra, corners with fourteen MgPm4Mg8 cuboctahedra, edges with six equivalent PmMg12 cuboctahedra, edges with twelve MgPm4Mg8 cuboctahedra, faces with four equivalent PmMg12 cuboctahedra, and faces with sixteen MgPm4Mg8 cuboctahedra. Both Mg–Mg bond lengths are 3.23 Å. There are two shorter (3.29 Å) and two longer (3.39 Å) Mg–Pm bond lengths. Pm is bonded to twelve Mg atoms to form PmMg12 cuboctahedra that share corners with six equivalent PmMg12 cuboctahedra, corners with twelve MgPm4Mg8 cuboctahedra, edges with eighteen MgPm4Mg8 cuboctahedra, faces with eight equivalent PmMg12 cuboctahedra, and faces with twelve MgPm4Mg8 cuboctahedra.
Mg2Pm is Cubic Laves structured and crystallizes in the trigonal R32 space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to six equivalent Mg and six equivalent Pm atoms to form a mixture of edge, face, and corner-sharing MgPm6Mg6 cuboctahedra. All Mg–Mg bond lengths are 3.05 Å. All Mg–Pm bond lengths are 3.58 Å. In the second Mg site, Mg is bonded to six Mg and six equivalent Pm atoms to form a mixture of edge, face, and corner-sharing MgPm6Mg6 cuboctahedra. All Mg–Mg bond lengths are 3.06 Å. There are four shorter (3.58 Å) and two longer (3.59 Å) Mg–Pm bond lengths. Pm is bonded in a 12-coordinate geometry to twelve Mg and four equivalent Pm atoms. All Pm–Pm bond lengths are 3.74 Å.
MgPm2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight Pm atoms. There are a spread of Mg–Pm bond distances ranging from 3.33–3.40 Å. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded in a 12-coordinate geometry to six equivalent Mg and four equivalent Pm atoms. There are two shorter (3.71 Å) and two longer (3.73 Å) Pm–Pm bond lengths. In the second Pm site, Pm is bonded in a 12-coordinate geometry to two equivalent Mg and ten Pm atoms. There are four shorter (3.47 Å) and two longer (3.80 Å) Pm–Pm bond lengths.