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SrMg is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sr is bonded in a body-centered cubic geometry to eight equivalent Mg atoms. All Sr–Mg bond lengths are 3.63 Å. Mg is bonded in a body-centered cubic geometry to eight equivalent Sr atoms.
Mg2Sr is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sr is bonded in a 12-coordinate geometry to four equivalent Sr and twelve Mg atoms. There are three shorter (3.93 Å) and one longer (4.00 Å) Sr–Sr bond lengths. There are a spread of Sr–Mg bond distances ranging from 3.75–3.83 Å. There are two inequivalent Mg sites. In the first Mg site, Mg is bonded to six equivalent Sr and six equivalent Mg atoms to form a mixture of corner, edge, and face-sharing MgSr6Mg6 cuboctahedra. All Mg–Mg bond lengths are 3.26 Å. In the second Mg site, Mg is bonded to six equivalent Sr and six Mg atoms to form a mixture of corner, edge, and face-sharing MgSr6Mg6 cuboctahedra. There are two shorter (3.17 Å) and two longer (3.21 Å) Mg–Mg bond lengths.
SrMg crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are three inequivalent Sr sites. In the first Sr site, Sr is bonded in a 12-coordinate geometry to three equivalent Sr and five Mg atoms. There are one shorter (3.93 Å) and two longer (4.10 Å) Sr–Sr bond lengths. There are a spread of Sr–Mg bond distances ranging from 3.55–3.67 Å. In the second Sr site, Sr is bonded in a 6-coordinate geometry to seven Sr and six Mg atoms. There are a spread of Sr–Sr bond distances ranging from 3.91–4.08 Å. There are a spread of Sr–Mg bond distances ranging from 3.69–4.04 Å. In the third Sr site, Sr is bonded in a 12-coordinate geometry to two equivalent Sr and six Mg atoms. There are a spread of Sr–Mg bond distances ranging from 3.64–3.74 Å. There are three inequivalent Mg sites. In the first Mg site, Mg is bonded in a 9-coordinate geometry to six Sr and three Mg atoms. There are one shorter (3.13 Å) and two longer (3.30 Å) Mg–Mg bond lengths. In the second Mg site, Mg is bonded in a 9-coordinate geometry to six Sr and three Mg atoms. Both Mg–Mg bond lengths are 3.21 Å. In the third Mg site, Mg is bonded in a distorted q6 geometry to five Sr and four Mg atoms.
Mg2Sr crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Sr is bonded to three equivalent Sr and nine Mg atoms to form distorted SrSr3Mg9 cuboctahedra that share corners with nine equivalent SrSr3Mg9 cuboctahedra, corners with nine equivalent MgSr6Mg6 cuboctahedra, edges with six equivalent SrSr3Mg9 cuboctahedra, faces with three equivalent MgSr6Mg6 cuboctahedra, and faces with five equivalent SrSr3Mg9 cuboctahedra. All Sr–Sr bond lengths are 3.66 Å. There are six shorter (3.61 Å) and three longer (3.66 Å) Sr–Mg bond lengths. There are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 8-coordinate geometry to four equivalent Sr and four Mg atoms. There are two shorter (3.16 Å) and two longer (3.35 Å) Mg–Mg bond lengths. In the second Mg site, Mg is bonded to six equivalent Sr and six equivalent Mg atoms to form MgSr6Mg6 cuboctahedra that share corners with eighteen equivalent SrSr3Mg9 cuboctahedra, edges with six equivalent MgSr6Mg6 cuboctahedra, faces with two equivalent MgSr6Mg6 cuboctahedra, and faces with six equivalent SrSr3Mg9 cuboctahedra.
Sr3Mg is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sr is bonded to eight equivalent Sr and four equivalent Mg atoms to form SrSr8Mg4 cuboctahedra that share corners with twelve equivalent SrSr8Mg4 cuboctahedra, edges with eight equivalent MgSr12 cuboctahedra, edges with sixteen equivalent SrSr8Mg4 cuboctahedra, faces with four equivalent MgSr12 cuboctahedra, and faces with fourteen equivalent SrSr8Mg4 cuboctahedra. All Sr–Sr bond lengths are 4.00 Å. All Sr–Mg bond lengths are 4.00 Å. Mg is bonded to twelve equivalent Sr atoms to form MgSr12 cuboctahedra that share corners with twelve equivalent MgSr12 cuboctahedra, edges with twenty-four equivalent SrSr8Mg4 cuboctahedra, faces with six equivalent MgSr12 cuboctahedra, and faces with twelve equivalent SrSr8Mg4 cuboctahedra.
SrMg is Zincblende, Sphalerite structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Sr is bonded to four equivalent Mg atoms to form corner-sharing SrMg4 tetrahedra. All Sr–Mg bond lengths are 3.40 Å. Mg is bonded to four equivalent Sr atoms to form corner-sharing MgSr4 tetrahedra.
Sr3Mg is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sr is bonded to eight equivalent Sr and four equivalent Mg atoms to form distorted SrSr8Mg4 cuboctahedra that share corners with four equivalent MgSr12 cuboctahedra, corners with fourteen equivalent SrSr8Mg4 cuboctahedra, edges with six equivalent MgSr12 cuboctahedra, edges with twelve equivalent SrSr8Mg4 cuboctahedra, faces with four equivalent MgSr12 cuboctahedra, and faces with sixteen equivalent SrSr8Mg4 cuboctahedra. There are a spread of Sr–Sr bond distances ranging from 3.88–4.09 Å. There are two shorter (3.94 Å) and two longer (3.99 Å) Sr–Mg bond lengths. Mg is bonded to twelve equivalent Sr atoms to form MgSr12 cuboctahedra that share corners with six equivalent MgSr12 cuboctahedra, corners with twelve equivalent SrSr8Mg4 cuboctahedra, edges with eighteen equivalent SrSr8Mg4 cuboctahedra, faces with eight equivalent MgSr12 cuboctahedra, and faces with twelve equivalent SrSr8Mg4 cuboctahedra.