FeCr2O4 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form CrO4 tetrahedra that share corners with six equivalent Cr(2)O6 octahedra and corners with six equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-69°. In the second Cr site, Cr(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form CrO6 octahedra that share corners with six equivalent Cr(1)O4 tetrahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Cr(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Cr(2)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Cr(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(2), and one Fe(1) atom.
FeCr2O4 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form CrO4 tetrahedra that share corners with six equivalent Cr(2)O6 octahedra and corners with six equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-69°. Both Cr(1)-O(1) bond lengths are 1.93 Å. Both Cr(1)-O(2) bond lengths are 2.00 Å. In the second Cr site, Cr(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form CrO6 octahedra that share corners with six equivalent Cr(1)O4 tetrahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. Both Cr(2)-O(1) bond lengths are 2.04 Å. All Cr(2)-O(2) bond lengths are 2.05 Å. Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Cr(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Cr(2)O6 octahedra. Both Fe(1)-O(2) bond lengths are 2.13 Å. All Fe(1)-O(1) bond lengths are 2.14 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Cr(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(2), and one Fe(1) atom.