Na3SmMn3(AsO5)3 crystallizes in the hexagonal P6_3/m space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. Sm(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(2) atoms. Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. As(1) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form AsO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-65°. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Mn(1), and one As(1) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one As(1) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Sm(1), and two equivalent Mn(1) atoms. In the fourth O site, O(2) is bonded to one Na(1), one Sm(1), one Mn(1), and one As(1) atom to form a mixture of distorted corner and edge-sharing ONaSmMnAs trigonal pyramids.
Na3SmMn3(AsO5)3 crystallizes in the hexagonal P6_3/m space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. The Na(1)-O(1) bond length is 2.80 Å. The Na(1)-O(3) bond length is 2.62 Å. Both Na(1)-O(2) bond lengths are 2.69 Å. There is one shorter (2.33 Å) and one longer (2.63 Å) Na(1)-O(4) bond length. Sm(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(2) atoms. All Sm(1)-O(1) bond lengths are 2.51 Å. All Sm(1)-O(2) bond lengths are 2.55 Å. Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Both Mn(1)-O(1) bond lengths are 1.93 Å. Both Mn(1)-O(2) bond lengths are 2.07 Å. Both Mn(1)-O(3) bond lengths are 2.13 Å. As(1) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form AsO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-65°. The As(1)-O(3) bond length is 1.73 Å. The As(1)-O(4) bond length is 1.69 Å. Both As(1)-O(2) bond lengths are 1.74 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Mn(1), and one As(1) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one As(1) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Sm(1), and two equivalent Mn(1) atoms. In the fourth O site, O(2) is bonded to one Na(1), one Sm(1), one Mn(1), and one As(1) atom to form a mixture of distorted corner and edge-sharing ONaSmMnAs trigonal pyramids.