The compound described by ZnCr2Se4 is Spinel structured and crystallizes in the cubic Fd-3m space group. Cr(1) is bonded to six equivalent Se(1) atoms to form CrSe6 octahedra that share corners with six equivalent Zn(1)Se4 tetrahedra and edges with six equivalent Cr(1)Se6 octahedra. Zn(1) is bonded to four equivalent Se(1) atoms to form ZnSe4 tetrahedra that share corners with twelve equivalent Cr(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 58°. Se(1) is bonded to three equivalent Cr(1) and one Zn(1) atom to form a mixture of distorted corner and edge-sharing SeZnCr3 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zn(CrSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.454
_cell_length_b   7.454
_cell_length_c   7.454
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   292.869
_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  0.125  0.125  0.125  1.0
  Zn  Zn1  1  0.875  0.875  0.875  1.0
  Cr  Cr2  1  0.500  1.000  0.500  1.0
  Cr  Cr3  1  1.000  0.500  0.500  1.0
  Cr  Cr4  1  0.500  0.500  0.500  1.0
  Cr  Cr5  1  0.500  0.500  0.000  1.0
  Se  Se6  1  0.260  0.260  0.260  1.0
  Se  Se7  1  0.740  0.740  0.279  1.0
  Se  Se8  1  0.279  0.740  0.740  1.0
  Se  Se9  1  0.740  0.279  0.740  1.0
  Se  Se10  1  0.721  0.260  0.260  1.0
  Se  Se11  1  0.260  0.721  0.260  1.0
  Se  Se12  1  0.260  0.260  0.721  1.0
  Se  Se13  1  0.740  0.740  0.740  1.0
[/CIF]
.
The compound described by ZnCr2Se4 is Spinel structured and crystallizes in the cubic Fd-3m space group. Cr(1) is bonded to six equivalent Se(1) atoms to form CrSe6 octahedra that share corners with six equivalent Zn(1)Se4 tetrahedra and edges with six equivalent Cr(1)Se6 octahedra. Zn(1) is bonded to four equivalent Se(1) atoms to form ZnSe4 tetrahedra that share corners with twelve equivalent Cr(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 58°. Se(1) is bonded to three equivalent Cr(1) and one Zn(1) atom to form a mixture of distorted corner and edge-sharing SeZnCr3 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zn(CrSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.454
_cell_length_b   7.454
_cell_length_c   7.454
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   292.869
_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  0.125  0.125  0.125  1.0
  Zn  Zn1  1  0.875  0.875  0.875  1.0
  Cr  Cr2  1  0.500  1.000  0.500  1.0
  Cr  Cr3  1  1.000  0.500  0.500  1.0
  Cr  Cr4  1  0.500  0.500  0.500  1.0
  Cr  Cr5  1  0.500  0.500  0.000  1.0
  Se  Se6  1  0.260  0.260  0.260  1.0
  Se  Se7  1  0.740  0.740  0.279  1.0
  Se  Se8  1  0.279  0.740  0.740  1.0
  Se  Se9  1  0.740  0.279  0.740  1.0
  Se  Se10  1  0.721  0.260  0.260  1.0
  Se  Se11  1  0.260  0.721  0.260  1.0
  Se  Se12  1  0.260  0.260  0.721  1.0
  Se  Se13  1  0.740  0.740  0.740  1.0
[/CIF]
.