SrMg6Ga crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Ga(1) atoms to form a mixture of corner and face-sharing SrMg10Ga2 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ga(1) atoms. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Sr(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one Ga(1) atom. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Ga(1) atoms. Ga(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Mg(3), two equivalent Mg(4), and four equivalent Mg(1) atoms.
SrMg6Ga crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Ga(1) atoms to form a mixture of corner and face-sharing SrMg10Ga2 cuboctahedra. Both Sr(1)-Mg(2) bond lengths are 3.42 Å. There are two shorter (3.32 Å) and two longer (3.45 Å) Sr(1)-Mg(1) bond lengths. All Sr(1)-Mg(3) bond lengths are 3.36 Å. Both Sr(1)-Ga(1) bond lengths are 3.22 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ga(1) atoms. The Mg(1)-Mg(1) bond length is 3.26 Å. There is one shorter (3.27 Å) and one longer (3.50 Å) Mg(1)-Mg(2) bond length. Both Mg(1)-Mg(3) bond lengths are 3.10 Å. Both Mg(1)-Mg(4) bond lengths are 3.27 Å. Both Mg(1)-Ga(1) bond lengths are 3.14 Å. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms. Both Mg(2)-Mg(4) bond lengths are 3.22 Å. All Mg(2)-Mg(3) bond lengths are 3.15 Å. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Sr(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one Ga(1) atom. The Mg(3)-Mg(3) bond length is 3.10 Å. There is one shorter (3.37 Å) and one longer (3.41 Å) Mg(3)-Mg(4) bond length. The Mg(3)-Ga(1) bond length is 3.09 Å. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Ga(1) atoms. Both Mg(4)-Ga(1) bond lengths are 3.42 Å. Ga(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Mg(3), two equivalent Mg(4), and four equivalent Mg(1) atoms.