CeZr7O16 is Baddeleyite-derived structured and crystallizes in the triclinic P1 space group. Ce(1) is bonded to one O(10), one O(11), one O(13), one O(2), one O(5), one O(6), and one O(8) atom to form distorted CeO7 pentagonal bipyramids that share  a cornercorner with one Zr(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(4)O7 pentagonal bipyramid,  a cornercorner with one Zr(5)O7 pentagonal bipyramid,  a cornercorner with one Zr(7)O7 pentagonal bipyramid,  an edgeedge with one Zr(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(4)O7 pentagonal bipyramid,  an edgeedge with one Zr(5)O7 pentagonal bipyramid,  an edgeedge with one Zr(7)O7 pentagonal bipyramid, and edges with two equivalent Zr(3)O7 pentagonal bipyramids. There are seven inequivalent Zr sites. In the first Zr site, Zr(1) is bonded to one O(1), one O(14), one O(3), one O(5), one O(6), one O(8), and one O(9) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ce(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(2)O7 pentagonal bipyramid,  a cornercorner with one Zr(3)O7 pentagonal bipyramid,  a cornercorner with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(3)O7 pentagonal bipyramid,  an edgeedge with one Zr(5)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid, and edges with two equivalent Zr(7)O7 pentagonal bipyramids. In the second Zr site, Zr(2) is bonded to one O(1), one O(10), one O(12), one O(16), one O(3), one O(4), and one O(8) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Zr(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(4)O7 pentagonal bipyramid,  a cornercorner with one Zr(5)O7 pentagonal bipyramid,  a cornercorner with one Zr(7)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(4)O7 pentagonal bipyramid,  an edgeedge with one Zr(5)O7 pentagonal bipyramid,  an edgeedge with one Zr(7)O7 pentagonal bipyramid, and edges with two equivalent Zr(6)O7 pentagonal bipyramids. In the third Zr site, Zr(3) is bonded to one O(11), one O(13), one O(15), one O(5), one O(6), one O(7), and one O(9) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Zr(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(4)O7 pentagonal bipyramid,  a cornercorner with one Zr(5)O7 pentagonal bipyramid,  a cornercorner with one Zr(7)O7 pentagonal bipyramid,  an edgeedge with one Zr(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(4)O7 pentagonal bipyramid,  an edgeedge with one Zr(5)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Zr(7)O7 pentagonal bipyramid, and edges with two equivalent Ce(1)O7 pentagonal bipyramids. In the fourth Zr site, Zr(4) is bonded to one O(10), one O(11), one O(15), one O(16), one O(2), one O(4), and one O(7) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ce(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(2)O7 pentagonal bipyramid,  a cornercorner with one Zr(3)O7 pentagonal bipyramid,  a cornercorner with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(3)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Zr(7)O7 pentagonal bipyramid, and edges with two equivalent Zr(5)O7 pentagonal bipyramids. In the fifth Zr site, Zr(5) is bonded to one O(1), one O(10), one O(12), one O(15), one O(2), one O(6), and one O(7) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ce(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(2)O7 pentagonal bipyramid,  a cornercorner with one Zr(3)O7 pentagonal bipyramid,  a cornercorner with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(3)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid, and edges with two equivalent Zr(4)O7 pentagonal bipyramids. In the sixth Zr site, Zr(6) is bonded to one O(1), one O(12), one O(14), one O(16), one O(4), one O(7), and one O(9) atom to form a mixture of distorted edge and corner-sharing ZrO7 pentagonal bipyramids. In the seventh Zr site, Zr(7) is bonded to one O(11), one O(13), one O(14), one O(16), one O(3), one O(8), and one O(9) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ce(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(2)O7 pentagonal bipyramid,  a cornercorner with one Zr(3)O7 pentagonal bipyramid,  a cornercorner with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(3)O7 pentagonal bipyramid,  an edgeedge with one Zr(4)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid, and edges with two equivalent Zr(1)O7 pentagonal bipyramids. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to one Zr(1), one Zr(2), one Zr(5), and one Zr(6) atom to form OZr4 tetrahedra that share corners with two equivalent O(8)CeZr3 tetrahedra, corners with two equivalent O(7)Zr4 tetrahedra,  an edgeedge with one O(10)CeZr3 tetrahedra,  an edgeedge with one O(6)CeZr3 tetrahedra,  an edgeedge with one O(16)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ce(1), one Zr(4), and one Zr(5) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Zr(1), one Zr(2), and one Zr(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zr(2), one Zr(4), and one Zr(6) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ce(1), one Zr(1), and one Zr(3) atom. In the sixth O site, O(6) is bonded to one Ce(1), one Zr(1), one Zr(3), and one Zr(5) atom to form OCeZr3 tetrahedra that share corners with two equivalent O(10)CeZr3 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(11)CeZr3 tetrahedra,  an edgeedge with one O(8)CeZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(7)Zr4 tetrahedra. In the seventh O site, O(7) is bonded to one Zr(3), one Zr(4), one Zr(5), and one Zr(6) atom to form OZr4 tetrahedra that share corners with two equivalent O(11)CeZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra,  an edgeedge with one O(10)CeZr3 tetrahedra,  an edgeedge with one O(6)CeZr3 tetrahedra,  an edgeedge with one O(16)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the eighth O site, O(8) is bonded to one Ce(1), one Zr(1), one Zr(2), and one Zr(7) atom to form OCeZr3 tetrahedra that share corners with two equivalent O(11)CeZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra,  an edgeedge with one O(10)CeZr3 tetrahedra,  an edgeedge with one O(6)CeZr3 tetrahedra,  an edgeedge with one O(16)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the ninth O site, O(9) is bonded to one Zr(1), one Zr(3), one Zr(6), and one Zr(7) atom to form OZr4 tetrahedra that share corners with two equivalent O(6)CeZr3 tetrahedra, corners with two equivalent O(16)Zr4 tetrahedra,  an edgeedge with one O(11)CeZr3 tetrahedra,  an edgeedge with one O(8)CeZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(7)Zr4 tetrahedra. In the tenth O site, O(10) is bonded to one Ce(1), one Zr(2), one Zr(4), and one Zr(5) atom to form OCeZr3 tetrahedra that share corners with two equivalent O(6)CeZr3 tetrahedra, corners with two equivalent O(16)Zr4 tetrahedra,  an edgeedge with one O(11)CeZr3 tetrahedra,  an edgeedge with one O(8)CeZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(7)Zr4 tetrahedra. In the eleventh O site, O(11) is bonded to one Ce(1), one Zr(3), one Zr(4), and one Zr(7) atom to form OCeZr3 tetrahedra that share corners with two equivalent O(8)CeZr3 tetrahedra, corners with two equivalent O(7)Zr4 tetrahedra,  an edgeedge with one O(10)CeZr3 tetrahedra,  an edgeedge with one O(6)CeZr3 tetrahedra,  an edgeedge with one O(16)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the twelfth O site, O(12) is bonded in a distorted trigonal non-coplanar geometry to one Zr(2), one Zr(5), and one Zr(6) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one Ce(1), one Zr(3), and one Zr(7) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal non-coplanar geometry to one Zr(1), one Zr(6), and one Zr(7) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one Zr(3), one Zr(4), and one Zr(5) atom. In the sixteenth O site, O(16) is bonded to one Zr(2), one Zr(4), one Zr(6), and one Zr(7) atom to form OZr4 tetrahedra that share corners with two equivalent O(10)CeZr3 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(11)CeZr3 tetrahedra,  an edgeedge with one O(8)CeZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(7)Zr4 tetrahedra.
CeZr7O16 is Baddeleyite-derived structured and crystallizes in the triclinic P1 space group. Ce(1) is bonded to one O(10), one O(11), one O(13), one O(2), one O(5), one O(6), and one O(8) atom to form distorted CeO7 pentagonal bipyramids that share  a cornercorner with one Zr(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(4)O7 pentagonal bipyramid,  a cornercorner with one Zr(5)O7 pentagonal bipyramid,  a cornercorner with one Zr(7)O7 pentagonal bipyramid,  an edgeedge with one Zr(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(4)O7 pentagonal bipyramid,  an edgeedge with one Zr(5)O7 pentagonal bipyramid,  an edgeedge with one Zr(7)O7 pentagonal bipyramid, and edges with two equivalent Zr(3)O7 pentagonal bipyramids. The Ce(1)-O(10) bond length is 2.38 Å. The Ce(1)-O(11) bond length is 2.31 Å. The Ce(1)-O(13) bond length is 2.25 Å. The Ce(1)-O(2) bond length is 2.19 Å. The Ce(1)-O(5) bond length is 2.18 Å. The Ce(1)-O(6) bond length is 2.43 Å. The Ce(1)-O(8) bond length is 2.33 Å. There are seven inequivalent Zr sites. In the first Zr site, Zr(1) is bonded to one O(1), one O(14), one O(3), one O(5), one O(6), one O(8), and one O(9) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ce(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(2)O7 pentagonal bipyramid,  a cornercorner with one Zr(3)O7 pentagonal bipyramid,  a cornercorner with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(3)O7 pentagonal bipyramid,  an edgeedge with one Zr(5)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid, and edges with two equivalent Zr(7)O7 pentagonal bipyramids. The Zr(1)-O(1) bond length is 2.18 Å. The Zr(1)-O(14) bond length is 2.13 Å. The Zr(1)-O(3) bond length is 2.20 Å. The Zr(1)-O(5) bond length is 2.07 Å. The Zr(1)-O(6) bond length is 2.28 Å. The Zr(1)-O(8) bond length is 2.19 Å. The Zr(1)-O(9) bond length is 2.34 Å. In the second Zr site, Zr(2) is bonded to one O(1), one O(10), one O(12), one O(16), one O(3), one O(4), and one O(8) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Zr(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(4)O7 pentagonal bipyramid,  a cornercorner with one Zr(5)O7 pentagonal bipyramid,  a cornercorner with one Zr(7)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(4)O7 pentagonal bipyramid,  an edgeedge with one Zr(5)O7 pentagonal bipyramid,  an edgeedge with one Zr(7)O7 pentagonal bipyramid, and edges with two equivalent Zr(6)O7 pentagonal bipyramids. The Zr(2)-O(1) bond length is 2.30 Å. The Zr(2)-O(10) bond length is 2.20 Å. The Zr(2)-O(12) bond length is 2.11 Å. The Zr(2)-O(16) bond length is 2.20 Å. The Zr(2)-O(3) bond length is 2.07 Å. The Zr(2)-O(4) bond length is 2.19 Å. The Zr(2)-O(8) bond length is 2.34 Å. In the third Zr site, Zr(3) is bonded to one O(11), one O(13), one O(15), one O(5), one O(6), one O(7), and one O(9) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Zr(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(4)O7 pentagonal bipyramid,  a cornercorner with one Zr(5)O7 pentagonal bipyramid,  a cornercorner with one Zr(7)O7 pentagonal bipyramid,  an edgeedge with one Zr(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(4)O7 pentagonal bipyramid,  an edgeedge with one Zr(5)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Zr(7)O7 pentagonal bipyramid, and edges with two equivalent Ce(1)O7 pentagonal bipyramids. The Zr(3)-O(11) bond length is 2.22 Å. The Zr(3)-O(13) bond length is 2.14 Å. The Zr(3)-O(15) bond length is 2.10 Å. The Zr(3)-O(5) bond length is 2.14 Å. The Zr(3)-O(6) bond length is 2.19 Å. The Zr(3)-O(7) bond length is 2.34 Å. The Zr(3)-O(9) bond length is 2.21 Å. In the fourth Zr site, Zr(4) is bonded to one O(10), one O(11), one O(15), one O(16), one O(2), one O(4), and one O(7) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ce(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(2)O7 pentagonal bipyramid,  a cornercorner with one Zr(3)O7 pentagonal bipyramid,  a cornercorner with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(3)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Zr(7)O7 pentagonal bipyramid, and edges with two equivalent Zr(5)O7 pentagonal bipyramids. The Zr(4)-O(10) bond length is 2.30 Å. The Zr(4)-O(11) bond length is 2.18 Å. The Zr(4)-O(15) bond length is 2.21 Å. The Zr(4)-O(16) bond length is 2.34 Å. The Zr(4)-O(2) bond length is 2.05 Å. The Zr(4)-O(4) bond length is 2.09 Å. The Zr(4)-O(7) bond length is 2.22 Å. In the fifth Zr site, Zr(5) is bonded to one O(1), one O(10), one O(12), one O(15), one O(2), one O(6), and one O(7) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ce(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(2)O7 pentagonal bipyramid,  a cornercorner with one Zr(3)O7 pentagonal bipyramid,  a cornercorner with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(3)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid, and edges with two equivalent Zr(4)O7 pentagonal bipyramids. The Zr(5)-O(1) bond length is 2.34 Å. The Zr(5)-O(10) bond length is 2.17 Å. The Zr(5)-O(12) bond length is 2.08 Å. The Zr(5)-O(15) bond length is 2.11 Å. The Zr(5)-O(2) bond length is 2.17 Å. The Zr(5)-O(6) bond length is 2.20 Å. The Zr(5)-O(7) bond length is 2.32 Å. In the sixth Zr site, Zr(6) is bonded to one O(1), one O(12), one O(14), one O(16), one O(4), one O(7), and one O(9) atom to form a mixture of distorted edge and corner-sharing ZrO7 pentagonal bipyramids. The Zr(6)-O(1) bond length is 2.21 Å. The Zr(6)-O(12) bond length is 2.20 Å. The Zr(6)-O(14) bond length is 2.09 Å. The Zr(6)-O(16) bond length is 2.28 Å. The Zr(6)-O(4) bond length is 2.12 Å. The Zr(6)-O(7) bond length is 2.19 Å. The Zr(6)-O(9) bond length is 2.30 Å. In the seventh Zr site, Zr(7) is bonded to one O(11), one O(13), one O(14), one O(16), one O(3), one O(8), and one O(9) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ce(1)O7 pentagonal bipyramid,  a cornercorner with one Zr(2)O7 pentagonal bipyramid,  a cornercorner with one Zr(3)O7 pentagonal bipyramid,  a cornercorner with one Zr(6)O7 pentagonal bipyramid,  an edgeedge with one Ce(1)O7 pentagonal bipyramid,  an edgeedge with one Zr(2)O7 pentagonal bipyramid,  an edgeedge with one Zr(3)O7 pentagonal bipyramid,  an edgeedge with one Zr(4)O7 pentagonal bipyramid,  an edgeedge with one Zr(6)O7 pentagonal bipyramid, and edges with two equivalent Zr(1)O7 pentagonal bipyramids. The Zr(7)-O(11) bond length is 2.27 Å. The Zr(7)-O(13) bond length is 2.08 Å. The Zr(7)-O(14) bond length is 2.19 Å. The Zr(7)-O(16) bond length is 2.20 Å. The Zr(7)-O(3) bond length is 2.13 Å. The Zr(7)-O(8) bond length is 2.27 Å. The Zr(7)-O(9) bond length is 2.21 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to one Zr(1), one Zr(2), one Zr(5), and one Zr(6) atom to form OZr4 tetrahedra that share corners with two equivalent O(8)CeZr3 tetrahedra, corners with two equivalent O(7)Zr4 tetrahedra,  an edgeedge with one O(10)CeZr3 tetrahedra,  an edgeedge with one O(6)CeZr3 tetrahedra,  an edgeedge with one O(16)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ce(1), one Zr(4), and one Zr(5) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Zr(1), one Zr(2), and one Zr(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zr(2), one Zr(4), and one Zr(6) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ce(1), one Zr(1), and one Zr(3) atom. In the sixth O site, O(6) is bonded to one Ce(1), one Zr(1), one Zr(3), and one Zr(5) atom to form OCeZr3 tetrahedra that share corners with two equivalent O(10)CeZr3 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(11)CeZr3 tetrahedra,  an edgeedge with one O(8)CeZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(7)Zr4 tetrahedra. In the seventh O site, O(7) is bonded to one Zr(3), one Zr(4), one Zr(5), and one Zr(6) atom to form OZr4 tetrahedra that share corners with two equivalent O(11)CeZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra,  an edgeedge with one O(10)CeZr3 tetrahedra,  an edgeedge with one O(6)CeZr3 tetrahedra,  an edgeedge with one O(16)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the eighth O site, O(8) is bonded to one Ce(1), one Zr(1), one Zr(2), and one Zr(7) atom to form OCeZr3 tetrahedra that share corners with two equivalent O(11)CeZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra,  an edgeedge with one O(10)CeZr3 tetrahedra,  an edgeedge with one O(6)CeZr3 tetrahedra,  an edgeedge with one O(16)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the ninth O site, O(9) is bonded to one Zr(1), one Zr(3), one Zr(6), and one Zr(7) atom to form OZr4 tetrahedra that share corners with two equivalent O(6)CeZr3 tetrahedra, corners with two equivalent O(16)Zr4 tetrahedra,  an edgeedge with one O(11)CeZr3 tetrahedra,  an edgeedge with one O(8)CeZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(7)Zr4 tetrahedra. In the tenth O site, O(10) is bonded to one Ce(1), one Zr(2), one Zr(4), and one Zr(5) atom to form OCeZr3 tetrahedra that share corners with two equivalent O(6)CeZr3 tetrahedra, corners with two equivalent O(16)Zr4 tetrahedra,  an edgeedge with one O(11)CeZr3 tetrahedra,  an edgeedge with one O(8)CeZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(7)Zr4 tetrahedra. In the eleventh O site, O(11) is bonded to one Ce(1), one Zr(3), one Zr(4), and one Zr(7) atom to form OCeZr3 tetrahedra that share corners with two equivalent O(8)CeZr3 tetrahedra, corners with two equivalent O(7)Zr4 tetrahedra,  an edgeedge with one O(10)CeZr3 tetrahedra,  an edgeedge with one O(6)CeZr3 tetrahedra,  an edgeedge with one O(16)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the twelfth O site, O(12) is bonded in a distorted trigonal non-coplanar geometry to one Zr(2), one Zr(5), and one Zr(6) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one Ce(1), one Zr(3), and one Zr(7) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal non-coplanar geometry to one Zr(1), one Zr(6), and one Zr(7) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one Zr(3), one Zr(4), and one Zr(5) atom. In the sixteenth O site, O(16) is bonded to one Zr(2), one Zr(4), one Zr(6), and one Zr(7) atom to form OZr4 tetrahedra that share corners with two equivalent O(10)CeZr3 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(11)CeZr3 tetrahedra,  an edgeedge with one O(8)CeZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(7)Zr4 tetrahedra.