Sn4(PO4)3 crystallizes in the trigonal R3c space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted T-shaped geometry to one O(1), one O(3), and one O(4) atom. In the second Sn site, Sn(2) is bonded in a distorted T-shaped geometry to three equivalent O(2) atoms. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(2) and one P(1) atom. In the third O site, O(3) is bonded in a distorted 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 120 degrees geometry to one Sn(1) and one P(1) atom.
Sn4(PO4)3 crystallizes in the trigonal R3c space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted T-shaped geometry to one O(1), one O(3), and one O(4) atom. The Sn(1)-O(1) bond length is 2.09 Å. The Sn(1)-O(3) bond length is 2.10 Å. The Sn(1)-O(4) bond length is 2.10 Å. In the second Sn site, Sn(2) is bonded in a distorted T-shaped geometry to three equivalent O(2) atoms. All Sn(2)-O(2) bond lengths are 2.15 Å. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(2) bond length is 1.55 Å. The P(1)-O(3) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.56 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(2) and one P(1) atom. In the third O site, O(3) is bonded in a distorted 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 120 degrees geometry to one Sn(1) and one P(1) atom.