SrMg6Al crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Al(1) atoms to form a mixture of corner and face-sharing SrMg10Al2 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Al(1) atom. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent Sr(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(1), and two equivalent Al(1) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(1), and two equivalent Al(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(3), and four equivalent Mg(1) atoms. Al(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(3), and four equivalent Mg(2) atoms.
SrMg6Al crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Al(1) atoms to form a mixture of corner and face-sharing SrMg10Al2 cuboctahedra. Both Sr(1)-Mg(4) bond lengths are 3.32 Å. There are two shorter (3.40 Å) and two longer (3.44 Å) Sr(1)-Mg(1) bond lengths. All Sr(1)-Mg(2) bond lengths are 3.31 Å. Both Sr(1)-Al(1) bond lengths are 3.28 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Al(1) atom. There is one shorter (3.21 Å) and one longer (3.34 Å) Mg(1)-Mg(1) bond length. Both Mg(1)-Mg(2) bond lengths are 3.23 Å. Both Mg(1)-Mg(3) bond lengths are 3.28 Å. Both Mg(1)-Mg(4) bond lengths are 3.18 Å. The Mg(1)-Al(1) bond length is 3.28 Å. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent Sr(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(1), and two equivalent Al(1) atoms. The Mg(2)-Mg(2) bond length is 3.01 Å. The Mg(2)-Mg(3) bond length is 3.31 Å. The Mg(2)-Mg(4) bond length is 3.23 Å. Both Mg(2)-Al(1) bond lengths are 3.13 Å. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(1), and two equivalent Al(1) atoms. Both Mg(3)-Mg(4) bond lengths are 3.28 Å. Both Mg(3)-Al(1) bond lengths are 3.29 Å. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(3), and four equivalent Mg(1) atoms. Al(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(3), and four equivalent Mg(2) atoms.