ErMn2O4 is Spinel structured and crystallizes in the monoclinic C2/m space group. Er(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form ErO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, and corners with six equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form MnO6 octahedra that share corners with six equivalent Er(1)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with four equivalent Mn(3)O6 octahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form MnO6 octahedra that share corners with six equivalent Er(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with four equivalent Mn(3)O6 octahedra. In the third Mn site, Mn(3) 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 six equivalent Er(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Er(1), one Mn(2), and two equivalent Mn(3) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Er(1), one Mn(1), and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Er(1), one Mn(1), one Mn(2), and one Mn(3) atom.
ErMn2O4 is Spinel structured and crystallizes in the monoclinic C2/m space group. Er(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form ErO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, and corners with six equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. The Er(1)-O(1) bond length is 2.14 Å. The Er(1)-O(2) bond length is 2.15 Å. Both Er(1)-O(3) bond lengths are 2.13 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form MnO6 octahedra that share corners with six equivalent Er(1)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with four equivalent Mn(3)O6 octahedra. Both Mn(1)-O(2) bond lengths are 2.39 Å. All Mn(1)-O(3) bond lengths are 1.97 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form MnO6 octahedra that share corners with six equivalent Er(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with four equivalent Mn(3)O6 octahedra. Both Mn(2)-O(1) bond lengths are 2.22 Å. All Mn(2)-O(3) bond lengths are 2.20 Å. In the third Mn site, Mn(3) 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 six equivalent Er(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. Both Mn(3)-O(1) bond lengths are 2.08 Å. Both Mn(3)-O(2) bond lengths are 2.08 Å. Both Mn(3)-O(3) bond lengths are 2.31 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Er(1), one Mn(2), and two equivalent Mn(3) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Er(1), one Mn(1), and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Er(1), one Mn(1), one Mn(2), and one Mn(3) atom.