TaSn(PO4)3 crystallizes in the trigonal R3c space group. Ta(1) is bonded to three equivalent O(2) and three equivalent O(4) atoms to form TaO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. Sn(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-30°. There are four inequivalent O sites. In the first O site, O(2) is bonded in a bent 150 degrees geometry to one Ta(1) and one P(1) atom. In the second O site, O(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the third O site, O(4) is bonded in a bent 150 degrees geometry to one Ta(1) and one P(1) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom.
TaSn(PO4)3 crystallizes in the trigonal R3c space group. Ta(1) is bonded to three equivalent O(2) and three equivalent O(4) atoms to form TaO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. All Ta(1)-O(2) bond lengths are 2.02 Å. All Ta(1)-O(4) bond lengths are 1.96 Å. Sn(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. All Sn(1)-O(1) bond lengths are 2.03 Å. All Sn(1)-O(3) bond lengths are 2.03 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-30°. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(3) bond length is 1.51 Å. The P(1)-O(4) bond length is 1.57 Å. There are four inequivalent O sites. In the first O site, O(2) is bonded in a bent 150 degrees geometry to one Ta(1) and one P(1) atom. In the second O site, O(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the third O site, O(4) is bonded in a bent 150 degrees geometry to one Ta(1) and one P(1) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom.