Sr5Mg crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to three equivalent Sr(2) and three equivalent Mg(1) atoms. In the second Sr site, Sr(2) is bonded to three equivalent Sr(1), three equivalent Sr(3), and six equivalent Sr(2) atoms to form a mixture of edge, face, and corner-sharing SrSr12 cuboctahedra. In the third Sr site, Sr(3) is bonded to six equivalent Sr(2) and six equivalent Sr(3) atoms to form a mixture of edge, face, and corner-sharing SrSr12 cuboctahedra. Mg(1) is bonded in a 6-coordinate geometry to six equivalent Sr(1) atoms.
Sr5Mg crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to three equivalent Sr(2) and three equivalent Mg(1) atoms. All Sr(1)-Sr(2) bond lengths are 4.30 Å. All Sr(1)-Mg(1) bond lengths are 3.56 Å. In the second Sr site, Sr(2) is bonded to three equivalent Sr(1), three equivalent Sr(3), and six equivalent Sr(2) atoms to form a mixture of edge, face, and corner-sharing SrSr12 cuboctahedra. All Sr(2)-Sr(3) bond lengths are 4.26 Å. All Sr(2)-Sr(2) bond lengths are 4.28 Å. In the third Sr site, Sr(3) is bonded to six equivalent Sr(2) and six equivalent Sr(3) atoms to form a mixture of edge, face, and corner-sharing SrSr12 cuboctahedra. All Sr(3)-Sr(3) bond lengths are 4.28 Å. Mg(1) is bonded in a 6-coordinate geometry to six equivalent Sr(1) atoms.