SrMg14Ni crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form SrMg12 cuboctahedra that share corners with six equivalent Sr(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(1)Mg10Ni2 cuboctahedra, edges with six equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Ni(1)Mg12 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, and faces with six equivalent Mg(2)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Ni(1) atoms to form distorted MgMg10Ni2 cuboctahedra that share corners with four equivalent Sr(1)Mg12 cuboctahedra, corners with six equivalent Mg(1)Mg10Ni2 cuboctahedra, corners with eight equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with two equivalent Ni(1)Mg12 cuboctahedra, edges with four equivalent Mg(1)Mg10Ni2 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Ni(1)Mg12 cuboctahedra, and faces with four equivalent Mg(1)Mg10Ni2 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Ni(1)Mg12 cuboctahedra, corners with six equivalent Mg(2)Sr2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Mg10Ni2 cuboctahedra, edges with two equivalent Sr(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with two equivalent Mg(1)Mg10Ni2 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with four equivalent Mg(2)Sr2Mg10 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to one Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one Ni(1) atom. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form distorted MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with six equivalent Mg(1)Mg10Ni2 cuboctahedra, edges with six equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Sr(1)Mg12 cuboctahedra, faces with three equivalent Mg(1)Mg10Ni2 cuboctahedra, faces with three equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with three equivalent Ni(1)Mg12 cuboctahedra. Ni(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form NiMg12 cuboctahedra that share corners with six equivalent Ni(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with six equivalent Mg(1)Mg10Ni2 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with six equivalent Mg(1)Mg10Ni2 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra.
SrMg14Ni crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form SrMg12 cuboctahedra that share corners with six equivalent Sr(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(1)Mg10Ni2 cuboctahedra, edges with six equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Ni(1)Mg12 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, and faces with six equivalent Mg(2)Sr2Mg10 cuboctahedra. All Sr(1)-Mg(2) bond lengths are 3.22 Å. All Sr(1)-Mg(3) bond lengths are 3.38 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Ni(1) atoms to form distorted MgMg10Ni2 cuboctahedra that share corners with four equivalent Sr(1)Mg12 cuboctahedra, corners with six equivalent Mg(1)Mg10Ni2 cuboctahedra, corners with eight equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with two equivalent Ni(1)Mg12 cuboctahedra, edges with four equivalent Mg(1)Mg10Ni2 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Ni(1)Mg12 cuboctahedra, and faces with four equivalent Mg(1)Mg10Ni2 cuboctahedra. Both Mg(1)-Mg(4) bond lengths are 3.24 Å. There are two shorter (3.12 Å) and two longer (3.33 Å) Mg(1)-Mg(1) bond lengths. All Mg(1)-Mg(3) bond lengths are 3.01 Å. Both Mg(1)-Ni(1) bond lengths are 3.22 Å. In the second Mg site, Mg(2) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Ni(1)Mg12 cuboctahedra, corners with six equivalent Mg(2)Sr2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Mg10Ni2 cuboctahedra, edges with two equivalent Sr(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with two equivalent Mg(1)Mg10Ni2 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with four equivalent Mg(2)Sr2Mg10 cuboctahedra. Both Mg(2)-Mg(4) bond lengths are 3.14 Å. There are two shorter (3.11 Å) and two longer (3.34 Å) Mg(2)-Mg(2) bond lengths. All Mg(2)-Mg(3) bond lengths are 3.40 Å. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to one Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one Ni(1) atom. Both Mg(3)-Mg(4) bond lengths are 3.25 Å. The Mg(3)-Ni(1) bond length is 2.94 Å. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form distorted MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with six equivalent Mg(1)Mg10Ni2 cuboctahedra, edges with six equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Sr(1)Mg12 cuboctahedra, faces with three equivalent Mg(1)Mg10Ni2 cuboctahedra, faces with three equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with three equivalent Ni(1)Mg12 cuboctahedra. Ni(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form NiMg12 cuboctahedra that share corners with six equivalent Ni(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with six equivalent Mg(1)Mg10Ni2 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with six equivalent Mg(1)Mg10Ni2 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra.