SrMg14Ce crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(7), four equivalent Mg(3), four equivalent Mg(5), and two equivalent Ce(1) atoms to form SrCe2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg10 cuboctahedra, corners with six equivalent Sr(1)Ce2Mg10 cuboctahedra, edges with two equivalent Ce(1)Sr2Mg10 cuboctahedra, faces with two equivalent Mg(2)Mg10 cuboctahedra, and faces with two equivalent Ce(1)Sr2Mg10 cuboctahedra. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form distorted MgMg10 cuboctahedra that share corners with four equivalent Sr(1)Ce2Mg10 cuboctahedra, corners with four equivalent Mg(1)Mg10 cuboctahedra, edges with two equivalent Mg(2)Mg10 cuboctahedra, faces with two equivalent Mg(2)Mg10 cuboctahedra, and faces with two equivalent Ce(1)Sr2Mg10 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms to form distorted MgMg10 cuboctahedra that share corners with four equivalent Mg(2)Mg10 cuboctahedra, corners with four equivalent Ce(1)Sr2Mg10 cuboctahedra, edges with two equivalent Mg(1)Mg10 cuboctahedra, faces with two equivalent Sr(1)Ce2Mg10 cuboctahedra, and faces with two equivalent Mg(1)Mg10 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Ce(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms. In the fifth Mg site, Mg(5) is bonded in a 11-coordinate geometry to one Sr(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), one Mg(5), two equivalent Mg(6), two equivalent Mg(7), and one Ce(1) atom. In the sixth Mg site, Mg(6) is bonded in a 10-coordinate geometry to one Mg(1), two equivalent Mg(3), two equivalent Mg(4), four equivalent Mg(5), and one Ce(1) atom. In the seventh Mg site, Mg(7) is bonded in a 10-coordinate geometry to one Sr(1), one Mg(2), two equivalent Mg(3), two equivalent Mg(4), and four equivalent Mg(5) atoms. Ce(1) is bonded to two equivalent Sr(1), two equivalent Mg(6), four equivalent Mg(3), and four equivalent Mg(5) atoms to form CeSr2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Mg10 cuboctahedra, corners with six equivalent Ce(1)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Ce2Mg10 cuboctahedra, faces with two equivalent Sr(1)Ce2Mg10 cuboctahedra, and faces with two equivalent Mg(1)Mg10 cuboctahedra.
SrMg14Ce crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(7), four equivalent Mg(3), four equivalent Mg(5), and two equivalent Ce(1) atoms to form SrCe2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg10 cuboctahedra, corners with six equivalent Sr(1)Ce2Mg10 cuboctahedra, edges with two equivalent Ce(1)Sr2Mg10 cuboctahedra, faces with two equivalent Mg(2)Mg10 cuboctahedra, and faces with two equivalent Ce(1)Sr2Mg10 cuboctahedra. Both Sr(1)-Mg(7) bond lengths are 3.39 Å. There are two shorter (3.27 Å) and two longer (3.35 Å) Sr(1)-Mg(3) bond lengths. All Sr(1)-Mg(5) bond lengths are 3.45 Å. Both Sr(1)-Ce(1) bond lengths are 3.53 Å. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form distorted MgMg10 cuboctahedra that share corners with four equivalent Sr(1)Ce2Mg10 cuboctahedra, corners with four equivalent Mg(1)Mg10 cuboctahedra, edges with two equivalent Mg(2)Mg10 cuboctahedra, faces with two equivalent Mg(2)Mg10 cuboctahedra, and faces with two equivalent Ce(1)Sr2Mg10 cuboctahedra. Both Mg(1)-Mg(6) bond lengths are 3.28 Å. There are two shorter (3.28 Å) and two longer (3.34 Å) Mg(1)-Mg(4) bond lengths. All Mg(1)-Mg(5) bond lengths are 3.23 Å. In the second Mg site, Mg(2) is bonded to two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms to form distorted MgMg10 cuboctahedra that share corners with four equivalent Mg(2)Mg10 cuboctahedra, corners with four equivalent Ce(1)Sr2Mg10 cuboctahedra, edges with two equivalent Mg(1)Mg10 cuboctahedra, faces with two equivalent Sr(1)Ce2Mg10 cuboctahedra, and faces with two equivalent Mg(1)Mg10 cuboctahedra. Both Mg(2)-Mg(7) bond lengths are 3.25 Å. All Mg(2)-Mg(4) bond lengths are 3.31 Å. All Mg(2)-Mg(5) bond lengths are 3.27 Å. In the third Mg site, Mg(3) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Ce(1) atoms. Both Mg(3)-Mg(5) bond lengths are 3.37 Å. Both Mg(3)-Mg(6) bond lengths are 3.32 Å. Both Mg(3)-Mg(7) bond lengths are 3.39 Å. There is one shorter (3.25 Å) and one longer (3.36 Å) Mg(3)-Ce(1) bond length. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms. There is one shorter (3.51 Å) and one longer (3.56 Å) Mg(4)-Mg(4) bond length. Both Mg(4)-Mg(5) bond lengths are 3.18 Å. Both Mg(4)-Mg(6) bond lengths are 3.33 Å. Both Mg(4)-Mg(7) bond lengths are 3.27 Å. In the fifth Mg site, Mg(5) is bonded in a 11-coordinate geometry to one Sr(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), one Mg(5), two equivalent Mg(6), two equivalent Mg(7), and one Ce(1) atom. The Mg(5)-Mg(5) bond length is 3.45 Å. Both Mg(5)-Mg(6) bond lengths are 3.31 Å. There is one shorter (3.23 Å) and one longer (3.39 Å) Mg(5)-Mg(7) bond length. The Mg(5)-Ce(1) bond length is 3.39 Å. In the sixth Mg site, Mg(6) is bonded in a 10-coordinate geometry to one Mg(1), two equivalent Mg(3), two equivalent Mg(4), four equivalent Mg(5), and one Ce(1) atom. The Mg(6)-Ce(1) bond length is 3.33 Å. In the seventh Mg site, Mg(7) is bonded in a 10-coordinate geometry to one Sr(1), one Mg(2), two equivalent Mg(3), two equivalent Mg(4), and four equivalent Mg(5) atoms. Ce(1) is bonded to two equivalent Sr(1), two equivalent Mg(6), four equivalent Mg(3), and four equivalent Mg(5) atoms to form CeSr2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Mg10 cuboctahedra, corners with six equivalent Ce(1)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Ce2Mg10 cuboctahedra, faces with two equivalent Sr(1)Ce2Mg10 cuboctahedra, and faces with two equivalent Mg(1)Mg10 cuboctahedra.