BaSn(PO4)2 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 10-coordinate geometry to four equivalent O(1) and six equivalent O(3) atoms. Sn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with three equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-46°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Sn(1), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sn(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.
BaSn(PO4)2 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 10-coordinate geometry to four equivalent O(1) and six equivalent O(3) atoms. All Ba(1)-O(1) bond lengths are 2.83 Å. There are two shorter (2.83 Å) and four longer (3.19 Å) Ba(1)-O(3) bond lengths. Sn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. Both Sn(1)-O(2) bond lengths are 2.03 Å. All Sn(1)-O(1) bond lengths are 2.08 Å. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with three equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-46°. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.52 Å. Both P(1)-O(1) bond lengths are 1.57 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Sn(1), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sn(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.