SrMg3 crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to six equivalent Sr(1) and six equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing SrSr6Mg6 cuboctahedra. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to six equivalent Mg(2) atoms. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to three equivalent Sr(1) and three equivalent Mg(1) atoms.
SrMg3 crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to six equivalent Sr(1) and six equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing SrSr6Mg6 cuboctahedra. All Sr(1)-Sr(1) bond lengths are 3.57 Å. All Sr(1)-Mg(2) bond lengths are 3.62 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to six equivalent Mg(2) atoms. All Mg(1)-Mg(2) bond lengths are 3.24 Å. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to three equivalent Sr(1) and three equivalent Mg(1) atoms.