Mn2(PO4)3 crystallizes in the trigonal R-3 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form MnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to three equivalent O(2) and three equivalent O(3) atoms to form MnO6 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 Mn(1)O6 octahedra and corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-46°. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(1) atom. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(2) and one P(1) atom.
Mn2(PO4)3 crystallizes in the trigonal R-3 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form MnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. All Mn(1)-O(1) bond lengths are 1.93 Å. All Mn(1)-O(4) bond lengths are 1.94 Å. In the second Mn site, Mn(2) is bonded to three equivalent O(2) and three equivalent O(3) atoms to form MnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. All Mn(2)-O(2) bond lengths are 1.93 Å. All Mn(2)-O(3) bond lengths are 1.92 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 Mn(1)O6 octahedra and corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-46°. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(4) bond length is 1.54 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(1) atom. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(2) and one P(1) atom.