BaPdP2O7 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded to one O(1), one O(3), two equivalent O(4), and two equivalent O(5) atoms to form distorted BaO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. Pd(1) is bonded in a square co-planar geometry to two equivalent O(4) and two equivalent O(5) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with three equivalent Ba(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 42-67°. In the second P site, P(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with three equivalent Ba(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 9-58°. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted trigonal planar geometry to one Ba(1), one Pd(1), and one P(1) atom. In the second O site, O(1) is bonded in a distorted linear geometry to one Ba(1) and one P(2) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one Ba(1) and one P(1) atom. In the fifth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ba(1), one Pd(1), and one P(2) atom.
BaPdP2O7 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded to one O(1), one O(3), two equivalent O(4), and two equivalent O(5) atoms to form distorted BaO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The Ba(1)-O(1) bond length is 2.65 Å. The Ba(1)-O(3) bond length is 2.71 Å. Both Ba(1)-O(4) bond lengths are 2.79 Å. Both Ba(1)-O(5) bond lengths are 2.82 Å. Pd(1) is bonded in a square co-planar geometry to two equivalent O(4) and two equivalent O(5) atoms. Both Pd(1)-O(4) bond lengths are 2.04 Å. Both Pd(1)-O(5) bond lengths are 2.06 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with three equivalent Ba(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 42-67°. The P(1)-O(2) bond length is 1.63 Å. The P(1)-O(3) bond length is 1.51 Å. Both P(1)-O(5) bond lengths are 1.56 Å. In the second P site, P(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with three equivalent Ba(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 9-58°. The P(2)-O(1) bond length is 1.50 Å. The P(2)-O(2) bond length is 1.63 Å. Both P(2)-O(4) bond lengths are 1.56 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted trigonal planar geometry to one Ba(1), one Pd(1), and one P(1) atom. In the second O site, O(1) is bonded in a distorted linear geometry to one Ba(1) and one P(2) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one Ba(1) and one P(1) atom. In the fifth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ba(1), one Pd(1), and one P(2) atom.