KCr2Mn2O10 crystallizes in the monoclinic C2/m space group. K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Cr(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form CrO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-54°. Mn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Cr(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one Cr(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one K(1), one Cr(1), and one Mn(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Mn(1) atoms.
KCr2Mn2O10 crystallizes in the monoclinic C2/m space group. K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Both K(1)-O(1) bond lengths are 3.16 Å. Both K(1)-O(2) bond lengths are 2.94 Å. All K(1)-O(3) bond lengths are 2.82 Å. Cr(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form CrO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-54°. The Cr(1)-O(1) bond length is 1.71 Å. The Cr(1)-O(2) bond length is 1.62 Å. Both Cr(1)-O(3) bond lengths are 1.68 Å. Mn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Cr(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Both Mn(1)-O(1) bond lengths are 2.24 Å. Both Mn(1)-O(3) bond lengths are 2.04 Å. Both Mn(1)-O(4) bond lengths are 1.86 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one Cr(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one K(1), one Cr(1), and one Mn(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Mn(1) atoms.