SrMg14B crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a 12-coordinate geometry to two equivalent Mg(6), four equivalent Mg(3), four equivalent Mg(5), and two equivalent B(1) atoms. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form corner-sharing MgMg12 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(1), four equivalent Mg(4), and four equivalent Mg(5) atoms. In the third Mg site, Mg(3) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Mg(5), two equivalent Mg(6), and one B(1) atom. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), and two equivalent Mg(6) atoms. In the fifth Mg site, Mg(5) is bonded in a 10-coordinate geometry to one Sr(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), one Mg(7), two equivalent Mg(5), and two equivalent Mg(6) atoms. In the sixth Mg site, Mg(6) is bonded in a 12-coordinate geometry to one Sr(1), one Mg(1), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(7), and four equivalent Mg(5) atoms. In the seventh Mg site, Mg(7) is bonded in a single-bond geometry to two equivalent Mg(5), two equivalent Mg(6), and one B(1) atom. B(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Mg(3), and two equivalent Mg(7) atoms.
SrMg14B crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a 12-coordinate geometry to two equivalent Mg(6), four equivalent Mg(3), four equivalent Mg(5), and two equivalent B(1) atoms. Both Sr(1)-Mg(6) bond lengths are 3.24 Å. There are two shorter (3.22 Å) and two longer (3.39 Å) Sr(1)-Mg(3) bond lengths. All Sr(1)-Mg(5) bond lengths are 3.41 Å. Both Sr(1)-B(1) bond lengths are 3.18 Å. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form corner-sharing MgMg12 cuboctahedra. Both Mg(1)-Mg(2) bond lengths are 3.10 Å. Both Mg(1)-Mg(6) bond lengths are 3.11 Å. There are two shorter (3.24 Å) and two longer (3.36 Å) Mg(1)-Mg(4) bond lengths. All Mg(1)-Mg(5) bond lengths are 3.13 Å. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(1), four equivalent Mg(4), and four equivalent Mg(5) atoms. There are two shorter (3.23 Å) and two longer (3.37 Å) Mg(2)-Mg(4) bond lengths. All Mg(2)-Mg(5) bond lengths are 3.16 Å. In the third Mg site, Mg(3) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Mg(5), two equivalent Mg(6), and one B(1) atom. Both Mg(3)-Mg(5) bond lengths are 3.02 Å. Both Mg(3)-Mg(6) bond lengths are 3.45 Å. The Mg(3)-B(1) bond length is 2.47 Å. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), and two equivalent Mg(6) atoms. There is one shorter (3.02 Å) and one longer (3.19 Å) Mg(4)-Mg(4) bond length. Both Mg(4)-Mg(5) bond lengths are 3.11 Å. Both Mg(4)-Mg(6) bond lengths are 3.05 Å. In the fifth Mg site, Mg(5) is bonded in a 10-coordinate geometry to one Sr(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), one Mg(7), two equivalent Mg(5), and two equivalent Mg(6) atoms. The Mg(5)-Mg(7) bond length is 3.12 Å. There is one shorter (3.08 Å) and one longer (3.12 Å) Mg(5)-Mg(5) bond length. There is one shorter (3.21 Å) and one longer (3.40 Å) Mg(5)-Mg(6) bond length. In the sixth Mg site, Mg(6) is bonded in a 12-coordinate geometry to one Sr(1), one Mg(1), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(7), and four equivalent Mg(5) atoms. Both Mg(6)-Mg(7) bond lengths are 3.30 Å. In the seventh Mg site, Mg(7) is bonded in a single-bond geometry to two equivalent Mg(5), two equivalent Mg(6), and one B(1) atom. The Mg(7)-B(1) bond length is 2.60 Å. B(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Mg(3), and two equivalent Mg(7) atoms.