Ba2U(PO5)2 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 11-coordinate geometry to two equivalent O(1), two equivalent O(4), three equivalent O(3), and four equivalent O(2) atoms. U(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form UO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles are 52°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to two equivalent Ba(1) and one U(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one U(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one P(1) atom.
Ba2U(PO5)2 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 11-coordinate geometry to two equivalent O(1), two equivalent O(4), three equivalent O(3), and four equivalent O(2) atoms. Both Ba(1)-O(1) bond lengths are 3.30 Å. There is one shorter (2.68 Å) and one longer (2.78 Å) Ba(1)-O(4) bond length. There is one shorter (2.90 Å) and two longer (3.06 Å) Ba(1)-O(3) bond lengths. There are two shorter (3.07 Å) and two longer (3.11 Å) Ba(1)-O(2) bond lengths. U(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form UO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. Both U(1)-O(1) bond lengths are 1.82 Å. All U(1)-O(2) bond lengths are 2.31 Å. P(1) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles are 52°. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.53 Å. Both P(1)-O(2) bond lengths are 1.58 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to two equivalent Ba(1) and one U(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one U(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one P(1) atom.