Yb2Ce8O19 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal P-4m2 space group. Yb(1) is bonded in a distorted hexagonal planar geometry to two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are four inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. In the second Ce site, Ce(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. In the third Ce site, Ce(3) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(11), two equivalent O(3), and two equivalent O(4) atoms. In the fourth Ce site, Ce(4) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with two equivalent O(5)Ce4 tetrahedra, corners with two equivalent O(8)Yb2Ce2 tetrahedra, corners with four equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(2)Ce4 tetrahedra, corners with four equivalent O(7)Yb2Ce2 tetrahedra,  an edgeedge with one O(5)Ce4 tetrahedra,  an edgeedge with one O(8)Yb2Ce2 tetrahedra, and edges with four equivalent O(6)Ce4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Ce(1) and two equivalent Ce(4) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Ce(3) and two equivalent Ce(4) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the fourth O site, O(4) is bonded to four equivalent Ce(3) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Ce(1) and two equivalent Ce(4) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with two equivalent O(2)Ce4 tetrahedra, corners with two equivalent O(7)Yb2Ce2 tetrahedra, corners with four equivalent O(5)Ce4 tetrahedra, corners with four equivalent O(6)Ce4 tetrahedra, corners with four equivalent O(8)Yb2Ce2 tetrahedra,  an edgeedge with one O(2)Ce4 tetrahedra,  an edgeedge with one O(7)Yb2Ce2 tetrahedra, and edges with four equivalent O(1)Ce4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Yb(1) and two equivalent Ce(2) atoms to form OYb2Ce2 tetrahedra that share corners with two equivalent O(6)Ce4 tetrahedra, corners with two equivalent O(9)Yb4 tetrahedra, corners with four equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(7)Yb2Ce2 tetrahedra,  an edgeedge with one O(6)Ce4 tetrahedra,  an edgeedge with one O(9)Yb4 tetrahedra, and edges with four equivalent O(8)Yb2Ce2 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Yb(1) and two equivalent Ce(2) atoms to form OYb2Ce2 tetrahedra that share corners with two equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(6)Ce4 tetrahedra, corners with four equivalent O(8)Yb2Ce2 tetrahedra, corners with four equivalent O(9)Yb4 tetrahedra,  an edgeedge with one O(1)Ce4 tetrahedra, and edges with four equivalent O(7)Yb2Ce2 tetrahedra. In the ninth O site, O(9) is bonded to four equivalent Yb(1) atoms to form OYb4 tetrahedra that share corners with four equivalent O(7)Yb2Ce2 tetrahedra, corners with four equivalent O(9)Yb4 tetrahedra, corners with eight equivalent O(8)Yb2Ce2 tetrahedra, and edges with two equivalent O(7)Yb2Ce2 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Ce(3) and two equivalent Ce(4) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the eleventh O site, O(11) is bonded to four equivalent Ce(3) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra.
Yb2Ce8O19 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal P-4m2 space group. Yb(1) is bonded in a distorted hexagonal planar geometry to two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. Both Yb(1)-O(7) bond lengths are 2.29 Å. Both Yb(1)-O(8) bond lengths are 2.25 Å. Both Yb(1)-O(9) bond lengths are 2.43 Å. There are four inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. Both Ce(1)-O(1) bond lengths are 2.35 Å. Both Ce(1)-O(2) bond lengths are 2.37 Å. Both Ce(1)-O(5) bond lengths are 2.38 Å. Both Ce(1)-O(6) bond lengths are 2.34 Å. In the second Ce site, Ce(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. Both Ce(2)-O(1) bond lengths are 2.39 Å. Both Ce(2)-O(6) bond lengths are 2.40 Å. Both Ce(2)-O(7) bond lengths are 2.31 Å. Both Ce(2)-O(8) bond lengths are 2.35 Å. In the third Ce site, Ce(3) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(11), two equivalent O(3), and two equivalent O(4) atoms. Both Ce(3)-O(10) bond lengths are 2.36 Å. Both Ce(3)-O(11) bond lengths are 2.36 Å. Both Ce(3)-O(3) bond lengths are 2.36 Å. Both Ce(3)-O(4) bond lengths are 2.36 Å. In the fourth Ce site, Ce(4) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. Both Ce(4)-O(10) bond lengths are 2.36 Å. Both Ce(4)-O(2) bond lengths are 2.36 Å. Both Ce(4)-O(3) bond lengths are 2.37 Å. Both Ce(4)-O(5) bond lengths are 2.35 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with two equivalent O(5)Ce4 tetrahedra, corners with two equivalent O(8)Yb2Ce2 tetrahedra, corners with four equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(2)Ce4 tetrahedra, corners with four equivalent O(7)Yb2Ce2 tetrahedra,  an edgeedge with one O(5)Ce4 tetrahedra,  an edgeedge with one O(8)Yb2Ce2 tetrahedra, and edges with four equivalent O(6)Ce4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Ce(1) and two equivalent Ce(4) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Ce(3) and two equivalent Ce(4) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the fourth O site, O(4) is bonded to four equivalent Ce(3) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Ce(1) and two equivalent Ce(4) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with two equivalent O(2)Ce4 tetrahedra, corners with two equivalent O(7)Yb2Ce2 tetrahedra, corners with four equivalent O(5)Ce4 tetrahedra, corners with four equivalent O(6)Ce4 tetrahedra, corners with four equivalent O(8)Yb2Ce2 tetrahedra,  an edgeedge with one O(2)Ce4 tetrahedra,  an edgeedge with one O(7)Yb2Ce2 tetrahedra, and edges with four equivalent O(1)Ce4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Yb(1) and two equivalent Ce(2) atoms to form OYb2Ce2 tetrahedra that share corners with two equivalent O(6)Ce4 tetrahedra, corners with two equivalent O(9)Yb4 tetrahedra, corners with four equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(7)Yb2Ce2 tetrahedra,  an edgeedge with one O(6)Ce4 tetrahedra,  an edgeedge with one O(9)Yb4 tetrahedra, and edges with four equivalent O(8)Yb2Ce2 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Yb(1) and two equivalent Ce(2) atoms to form OYb2Ce2 tetrahedra that share corners with two equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(6)Ce4 tetrahedra, corners with four equivalent O(8)Yb2Ce2 tetrahedra, corners with four equivalent O(9)Yb4 tetrahedra,  an edgeedge with one O(1)Ce4 tetrahedra, and edges with four equivalent O(7)Yb2Ce2 tetrahedra. In the ninth O site, O(9) is bonded to four equivalent Yb(1) atoms to form OYb4 tetrahedra that share corners with four equivalent O(7)Yb2Ce2 tetrahedra, corners with four equivalent O(9)Yb4 tetrahedra, corners with eight equivalent O(8)Yb2Ce2 tetrahedra, and edges with two equivalent O(7)Yb2Ce2 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Ce(3) and two equivalent Ce(4) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the eleventh O site, O(11) is bonded to four equivalent Ce(3) atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra.