The structure described by ZnCr2O4 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 Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-66°. 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 Zn(1)O6 octahedra. Zn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Cr(1)O4 tetrahedra, edges with two equivalent Zn(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 Zn(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 Zn(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_ZnCr2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.986
_cell_length_b   5.986
_cell_length_c   5.986
_cell_angle_alpha   119.424
_cell_angle_beta   117.136
_cell_angle_gamma   93.017
_symmetry_Int_Tables_number   1
_cell_volume   155.326
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Zn  Zn0  1  0.000  0.500  0.500  1.0
  Zn  Zn1  1  0.500  0.500  0.000  1.0
  Cr  Cr2  1  0.124  0.874  0.250  1.0
  Cr  Cr3  1  0.876  0.126  0.750  1.0
  Cr  Cr4  1  0.500  0.000  0.000  1.0
  Cr  Cr5  1  0.500  0.500  0.500  1.0
  O  O6  1  0.746  0.259  0.013  1.0
  O  O7  1  0.712  0.242  0.470  1.0
  O  O8  1  0.746  0.733  0.487  1.0
  O  O9  1  0.272  0.242  0.030  1.0
  O  O10  1  0.728  0.758  0.970  1.0
  O  O11  1  0.288  0.758  0.530  1.0
  O  O12  1  0.254  0.267  0.513  1.0
  O  O13  1  0.254  0.741  0.987  1.0
[/CIF]
.
The structure described by ZnCr2O4 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 Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-66°. 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 Zn(1)O6 octahedra. Zn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Cr(1)O4 tetrahedra, edges with two equivalent Zn(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 Zn(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 Zn(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_ZnCr2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.986
_cell_length_b   5.986
_cell_length_c   5.986
_cell_angle_alpha   119.424
_cell_angle_beta   117.136
_cell_angle_gamma   93.017
_symmetry_Int_Tables_number   1
_cell_volume   155.326
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Zn  Zn0  1  0.000  0.500  0.500  1.0
  Zn  Zn1  1  0.500  0.500  0.000  1.0
  Cr  Cr2  1  0.124  0.874  0.250  1.0
  Cr  Cr3  1  0.876  0.126  0.750  1.0
  Cr  Cr4  1  0.500  0.000  0.000  1.0
  Cr  Cr5  1  0.500  0.500  0.500  1.0
  O  O6  1  0.746  0.259  0.013  1.0
  O  O7  1  0.712  0.242  0.470  1.0
  O  O8  1  0.746  0.733  0.487  1.0
  O  O9  1  0.272  0.242  0.030  1.0
  O  O10  1  0.728  0.758  0.970  1.0
  O  O11  1  0.288  0.758  0.530  1.0
  O  O12  1  0.254  0.267  0.513  1.0
  O  O13  1  0.254  0.741  0.987  1.0
[/CIF]
.