SrMg6Mo 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 Mo(1) atoms to form SrMg10Mo2 cuboctahedra that share corners with four equivalent Mg(2)Sr2Mg10 cuboctahedra, corners with six equivalent Sr(1)Mg10Mo2 cuboctahedra, edges with two equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with four equivalent Mo(1)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with two equivalent Mo(1)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Mo(1) atoms. In the second Mg site, Mg(2) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Sr(1)Mg10Mo2 cuboctahedra, corners with six equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with six equivalent Mo(1)Sr2Mg10 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Mo(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted linear geometry to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Mo(1) atoms. Mo(1) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form MoSr2Mg10 cuboctahedra that share corners with six equivalent Mo(1)Sr2Mg10 cuboctahedra, edges with four equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Mo(1)Sr2Mg10 cuboctahedra, and faces with six equivalent Mg(2)Sr2Mg10 cuboctahedra.
SrMg6Mo 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 Mo(1) atoms to form SrMg10Mo2 cuboctahedra that share corners with four equivalent Mg(2)Sr2Mg10 cuboctahedra, corners with six equivalent Sr(1)Mg10Mo2 cuboctahedra, edges with two equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with four equivalent Mo(1)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with two equivalent Mo(1)Sr2Mg10 cuboctahedra. Both Sr(1)-Mg(2) bond lengths are 3.29 Å. There are two shorter (3.16 Å) and two longer (3.40 Å) Sr(1)-Mg(1) bond lengths. All Sr(1)-Mg(3) bond lengths are 3.29 Å. Both Sr(1)-Mo(1) bond lengths are 3.26 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Mo(1) atoms. There is one shorter (3.05 Å) and one longer (3.52 Å) Mg(1)-Mg(1) bond length. There is one shorter (3.22 Å) and one longer (3.34 Å) Mg(1)-Mg(2) bond length. Both Mg(1)-Mg(3) bond lengths are 3.16 Å. Both Mg(1)-Mg(4) bond lengths are 3.25 Å. Both Mg(1)-Mo(1) bond lengths are 3.09 Å. In the second Mg site, Mg(2) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Sr(1)Mg10Mo2 cuboctahedra, corners with six equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with six equivalent Mo(1)Sr2Mg10 cuboctahedra. Both Mg(2)-Mg(4) bond lengths are 3.22 Å. All Mg(2)-Mg(3) bond lengths are 3.17 Å. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Mo(1) atoms. There is one shorter (3.25 Å) and one longer (3.32 Å) Mg(3)-Mg(4) bond length. There is one shorter (3.02 Å) and one longer (3.54 Å) Mg(3)-Mo(1) bond length. In the fourth Mg site, Mg(4) is bonded in a distorted linear geometry to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Mo(1) atoms. Both Mg(4)-Mo(1) bond lengths are 3.29 Å. Mo(1) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form MoSr2Mg10 cuboctahedra that share corners with six equivalent Mo(1)Sr2Mg10 cuboctahedra, edges with four equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Sr(1)Mg10Mo2 cuboctahedra, faces with two equivalent Mo(1)Sr2Mg10 cuboctahedra, and faces with six equivalent Mg(2)Sr2Mg10 cuboctahedra.