NaSn2(PO4)3 crystallizes in the trigonal R-3 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to six equivalent O(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to three equivalent O(2) and three equivalent O(3) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. In the second Sn site, Sn(2) is bonded to three equivalent O(1) and three equivalent O(4) 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 Sn(1)O6 octahedra and corners with two equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-41°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(2), one Sn(2), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Sn(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Sn(2) and one P(1) atom.
NaSn2(PO4)3 crystallizes in the trigonal R-3 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(2) atoms. All Na(1)-O(2) bond lengths are 2.51 Å. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to six equivalent O(1) atoms. All Na(2)-O(1) bond lengths are 2.47 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to three equivalent O(2) and three equivalent O(3) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. All Sn(1)-O(2) bond lengths are 2.04 Å. All Sn(1)-O(3) bond lengths are 2.02 Å. In the second Sn site, Sn(2) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. All Sn(2)-O(1) bond lengths are 2.04 Å. All Sn(2)-O(4) bond lengths are 2.01 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 Sn(1)O6 octahedra and corners with two equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-41°. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.52 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(2), one Sn(2), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Sn(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Sn(2) and one P(1) atom.