KMg14Ce crystallizes in the hexagonal P-6m2 space group. K(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form KMg12 cuboctahedra that share corners with six equivalent K(1)Mg12 cuboctahedra, faces with two equivalent Ce(1)Mg12 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted linear geometry to two equivalent K(1) and two equivalent Mg(4) atoms. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(3), and two equivalent Ce(1) atoms. In the third Mg site, Mg(3) is bonded in a 2-coordinate geometry to one K(1), two equivalent Mg(2), two equivalent Mg(4), and one Ce(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, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent K(1)Mg12 cuboctahedra, and faces with three equivalent Ce(1)Mg12 cuboctahedra. Ce(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form CeMg12 cuboctahedra that share corners with six equivalent Ce(1)Mg12 cuboctahedra, faces with two equivalent K(1)Mg12 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra.
KMg14Ce crystallizes in the hexagonal P-6m2 space group. K(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form KMg12 cuboctahedra that share corners with six equivalent K(1)Mg12 cuboctahedra, faces with two equivalent Ce(1)Mg12 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra. All K(1)-Mg(1) bond lengths are 3.56 Å. All K(1)-Mg(3) bond lengths are 3.49 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted linear geometry to two equivalent K(1) and two equivalent Mg(4) atoms. Both Mg(1)-Mg(4) bond lengths are 3.45 Å. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(3), and two equivalent Ce(1) atoms. Both Mg(2)-Mg(2) bond lengths are 3.48 Å. Both Mg(2)-Mg(4) bond lengths are 3.43 Å. All Mg(2)-Mg(3) bond lengths are 3.32 Å. Both Mg(2)-Ce(1) bond lengths are 3.56 Å. In the third Mg site, Mg(3) is bonded in a 2-coordinate geometry to one K(1), two equivalent Mg(2), two equivalent Mg(4), and one Ce(1) atom. Both Mg(3)-Mg(4) bond lengths are 3.56 Å. The Mg(3)-Ce(1) bond length is 3.35 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, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent K(1)Mg12 cuboctahedra, and faces with three equivalent Ce(1)Mg12 cuboctahedra. Ce(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form CeMg12 cuboctahedra that share corners with six equivalent Ce(1)Mg12 cuboctahedra, faces with two equivalent K(1)Mg12 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra.