Ba2CdP3O11 crystallizes in the monoclinic Cm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one O(5), one O(6), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Ba site, Ba(2) is bonded in a 12-coordinate geometry to one O(4), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. Cd(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted CdO6 pentagonal pyramids that share corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(6), one O(7), and two equivalent O(1) atoms to form PO4 tetrahedra that share  an edgeedge with one Cd(1)O6 pentagonal pyramid. In the second P site, P(2) is bonded to one O(5), one O(8), and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent Cd(1)O6 pentagonal pyramids and  a cornercorner with one P(3)O4 tetrahedra. In the third P site, P(3) is bonded to one O(4), one O(8), and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with two equivalent Cd(1)O6 pentagonal pyramids and  a cornercorner with one P(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), one Cd(1), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Cd(1), and one P(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Cd(1), and one P(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1), two equivalent Ba(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(1), two equivalent Ba(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Ba(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom.
Ba2CdP3O11 crystallizes in the monoclinic Cm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one O(5), one O(6), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Ba(1)-O(5) bond length is 2.79 Å. The Ba(1)-O(6) bond length is 2.90 Å. Both Ba(1)-O(1) bond lengths are 2.84 Å. Both Ba(1)-O(2) bond lengths are 2.95 Å. Both Ba(1)-O(3) bond lengths are 2.86 Å. Both Ba(1)-O(4) bond lengths are 3.08 Å. In the second Ba site, Ba(2) is bonded in a 12-coordinate geometry to one O(4), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. The Ba(2)-O(4) bond length is 2.86 Å. The Ba(2)-O(7) bond length is 3.07 Å. Both Ba(2)-O(1) bond lengths are 2.91 Å. Both Ba(2)-O(2) bond lengths are 2.82 Å. Both Ba(2)-O(3) bond lengths are 3.00 Å. Both Ba(2)-O(5) bond lengths are 3.32 Å. Both Ba(2)-O(6) bond lengths are 3.38 Å. Cd(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted CdO6 pentagonal pyramids that share corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. Both Cd(1)-O(1) bond lengths are 2.46 Å. Both Cd(1)-O(2) bond lengths are 2.29 Å. Both Cd(1)-O(3) bond lengths are 2.30 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(6), one O(7), and two equivalent O(1) atoms to form PO4 tetrahedra that share  an edgeedge with one Cd(1)O6 pentagonal pyramid. The P(1)-O(6) bond length is 1.55 Å. The P(1)-O(7) bond length is 1.55 Å. Both P(1)-O(1) bond lengths are 1.56 Å. In the second P site, P(2) is bonded to one O(5), one O(8), and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent Cd(1)O6 pentagonal pyramids and  a cornercorner with one P(3)O4 tetrahedra. The P(2)-O(5) bond length is 1.51 Å. The P(2)-O(8) bond length is 1.63 Å. Both P(2)-O(2) bond lengths are 1.55 Å. In the third P site, P(3) is bonded to one O(4), one O(8), and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with two equivalent Cd(1)O6 pentagonal pyramids and  a cornercorner with one P(2)O4 tetrahedra. The P(3)-O(4) bond length is 1.52 Å. The P(3)-O(8) bond length is 1.62 Å. Both P(3)-O(3) bond lengths are 1.54 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), one Cd(1), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Cd(1), and one P(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Cd(1), and one P(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1), two equivalent Ba(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(1), two equivalent Ba(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Ba(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom.