SrMg crystallizes in the monoclinic Cm space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 4-coordinate geometry to two equivalent Sr(3), three equivalent Sr(2), two equivalent Mg(1), and two equivalent Mg(3) atoms. In the second Sr site, Sr(2) is bonded to two equivalent Sr(2), two equivalent Sr(3), three equivalent Sr(1), one Mg(3), two equivalent Mg(1), and two equivalent Mg(2) atoms to form a mixture of distorted face and corner-sharing SrSr7Mg5 cuboctahedra. In the third Sr site, Sr(3) is bonded in a 12-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(3), one Mg(1), two equivalent Mg(3), and three equivalent Mg(2) atoms. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one Sr(3), two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mg(2) atoms. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent Sr(2), three equivalent Sr(3), two equivalent Mg(1), and two equivalent Mg(3) atoms. In the third Mg site, Mg(3) is bonded in a 7-coordinate geometry to one Sr(2), two equivalent Sr(1), two equivalent Sr(3), and two equivalent Mg(2) atoms.
SrMg crystallizes in the monoclinic Cm space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 4-coordinate geometry to two equivalent Sr(3), three equivalent Sr(2), two equivalent Mg(1), and two equivalent Mg(3) atoms. Both Sr(1)-Sr(3) bond lengths are 4.01 Å. There is one shorter (3.86 Å) and two longer (3.89 Å) Sr(1)-Sr(2) bond lengths. Both Sr(1)-Mg(1) bond lengths are 3.42 Å. Both Sr(1)-Mg(3) bond lengths are 3.50 Å. In the second Sr site, Sr(2) is bonded to two equivalent Sr(2), two equivalent Sr(3), three equivalent Sr(1), one Mg(3), two equivalent Mg(1), and two equivalent Mg(2) atoms to form a mixture of distorted face and corner-sharing SrSr7Mg5 cuboctahedra. Both Sr(2)-Sr(2) bond lengths are 4.03 Å. Both Sr(2)-Sr(3) bond lengths are 4.01 Å. The Sr(2)-Mg(3) bond length is 3.73 Å. Both Sr(2)-Mg(1) bond lengths are 3.75 Å. Both Sr(2)-Mg(2) bond lengths are 3.87 Å. In the third Sr site, Sr(3) is bonded in a 12-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(3), one Mg(1), two equivalent Mg(3), and three equivalent Mg(2) atoms. Both Sr(3)-Sr(3) bond lengths are 4.03 Å. The Sr(3)-Mg(1) bond length is 3.33 Å. Both Sr(3)-Mg(3) bond lengths are 3.61 Å. There are two shorter (3.77 Å) and one longer (3.92 Å) Sr(3)-Mg(2) bond length. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one Sr(3), two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mg(2) atoms. Both Mg(1)-Mg(2) bond lengths are 3.45 Å. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent Sr(2), three equivalent Sr(3), two equivalent Mg(1), and two equivalent Mg(3) atoms. Both Mg(2)-Mg(3) bond lengths are 3.29 Å. In the third Mg site, Mg(3) is bonded in a 7-coordinate geometry to one Sr(2), two equivalent Sr(1), two equivalent Sr(3), and two equivalent Mg(2) atoms.