ZnMn3O7 crystallizes in the trigonal R-3 space group. Mn(1) is bonded to one O(3), two equivalent O(2), and three equivalent O(1) atoms to form MnO6 octahedra that share corners with three equivalent Zn(1)O4 tetrahedra and edges with five equivalent Mn(1)O6 octahedra. Zn(1) is bonded to one O(3) and three equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with nine equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 57-59°. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal pyramidal geometry to three equivalent Mn(1) and one Zn(1) atom. In the second O site, O(1) is bonded in a distorted T-shaped geometry to three equivalent Mn(1) atoms. In the third O site, O(2) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Zn(1) atom.
ZnMn3O7 crystallizes in the trigonal R-3 space group. Mn(1) is bonded to one O(3), two equivalent O(2), and three equivalent O(1) atoms to form MnO6 octahedra that share corners with three equivalent Zn(1)O4 tetrahedra and edges with five equivalent Mn(1)O6 octahedra. The Mn(1)-O(3) bond length is 1.96 Å. There is one shorter (1.85 Å) and one longer (1.87 Å) Mn(1)-O(2) bond length. There are two shorter (1.89 Å) and one longer (1.93 Å) Mn(1)-O(1) bond length. Zn(1) is bonded to one O(3) and three equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with nine equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 57-59°. The Zn(1)-O(3) bond length is 1.95 Å. All Zn(1)-O(2) bond lengths are 1.95 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal pyramidal geometry to three equivalent Mn(1) and one Zn(1) atom. In the second O site, O(1) is bonded in a distorted T-shaped geometry to three equivalent Mn(1) atoms. In the third O site, O(2) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Zn(1) atom.