The crystal structure described by Cr3N2 is Corundum-like structured and crystallizes in the cubic I2_13 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(3), and two equivalent N(2) atoms to form a mixture of corner and edge-sharing CrN4 trigonal pyramids. In the second Cr site, Cr(2) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form a mixture of corner and edge-sharing CrN4 trigonal pyramids. There are three inequivalent N sites. In the first N site, N(1) is bonded to three equivalent Cr(1) and three equivalent Cr(2) atoms to form a mixture of corner and edge-sharing NCr6 octahedra. The corner-sharing octahedral tilt angles range from 49-53°. In the second N site, N(2) is bonded to two equivalent Cr(2) and four equivalent Cr(1) atoms to form a mixture of distorted corner and edge-sharing NCr6 octahedra. The corner-sharing octahedral tilt angles range from 50-53°. In the third N site, N(3) is bonded to two equivalent Cr(1) and four equivalent Cr(2) atoms to form a mixture of distorted corner and edge-sharing NCr6 octahedra. The corner-sharing octahedral tilt angles range from 49-52°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cr3N2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.921
_cell_length_b   7.921
_cell_length_c   7.921
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   382.634
_cell_formula_units_Z   8
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
  Cr  Cr0  1  0.765  0.222  0.273  1.0
  Cr  Cr1  1  0.008  0.457  0.735  1.0
  Cr  Cr2  1  0.227  0.448  0.492  1.0
  Cr  Cr3  1  0.052  0.278  0.043  1.0
  Cr  Cr4  1  0.278  0.043  0.052  1.0
  Cr  Cr5  1  0.043  0.052  0.278  1.0
  Cr  Cr6  1  0.735  0.008  0.457  1.0
  Cr  Cr7  1  0.492  0.227  0.448  1.0
  Cr  Cr8  1  0.273  0.765  0.222  1.0
  Cr  Cr9  1  0.448  0.492  0.227  1.0
  Cr  Cr10  1  0.222  0.273  0.765  1.0
  Cr  Cr11  1  0.457  0.735  0.008  1.0
  Cr  Cr12  1  0.991  0.546  0.272  1.0
  Cr  Cr13  1  0.781  0.555  0.509  1.0
  Cr  Cr14  1  0.228  0.774  0.719  1.0
  Cr  Cr15  1  0.726  0.954  0.945  1.0
  Cr  Cr16  1  0.954  0.945  0.726  1.0
  Cr  Cr17  1  0.945  0.726  0.954  1.0
  Cr  Cr18  1  0.509  0.781  0.555  1.0
  Cr  Cr19  1  0.719  0.228  0.774  1.0
  Cr  Cr20  1  0.272  0.991  0.546  1.0
  Cr  Cr21  1  0.774  0.719  0.228  1.0
  Cr  Cr22  1  0.546  0.272  0.991  1.0
  Cr  Cr23  1  0.555  0.509  0.781  1.0
  N  N24  1  0.000  0.496  0.500  1.0
  N  N25  1  0.004  0.004  0.004  1.0
  N  N26  1  0.500  0.000  0.496  1.0
  N  N27  1  0.496  0.500  0.000  1.0
  N  N28  1  0.750  0.956  0.206  1.0
  N  N29  1  0.956  0.206  0.750  1.0
  N  N30  1  0.294  0.250  0.544  1.0
  N  N31  1  0.250  0.544  0.294  1.0
  N  N32  1  0.544  0.294  0.250  1.0
  N  N33  1  0.206  0.750  0.956  1.0
  N  N34  1  0.750  0.455  0.705  1.0
  N  N35  1  0.455  0.705  0.750  1.0
  N  N36  1  0.795  0.250  0.045  1.0
  N  N37  1  0.250  0.045  0.795  1.0
  N  N38  1  0.045  0.795  0.250  1.0
  N  N39  1  0.705  0.750  0.455  1.0
[/CIF]
.
The crystal structure described by Cr3N2 is Corundum-like structured and crystallizes in the cubic I2_13 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(3), and two equivalent N(2) atoms to form a mixture of corner and edge-sharing CrN4 trigonal pyramids. In the second Cr site, Cr(2) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form a mixture of corner and edge-sharing CrN4 trigonal pyramids. There are three inequivalent N sites. In the first N site, N(1) is bonded to three equivalent Cr(1) and three equivalent Cr(2) atoms to form a mixture of corner and edge-sharing NCr6 octahedra. The corner-sharing octahedral tilt angles range from 49-53°. In the second N site, N(2) is bonded to two equivalent Cr(2) and four equivalent Cr(1) atoms to form a mixture of distorted corner and edge-sharing NCr6 octahedra. The corner-sharing octahedral tilt angles range from 50-53°. In the third N site, N(3) is bonded to two equivalent Cr(1) and four equivalent Cr(2) atoms to form a mixture of distorted corner and edge-sharing NCr6 octahedra. The corner-sharing octahedral tilt angles range from 49-52°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cr3N2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.921
_cell_length_b   7.921
_cell_length_c   7.921
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   382.634
_cell_formula_units_Z   8
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
  Cr  Cr0  1  0.765  0.222  0.273  1.0
  Cr  Cr1  1  0.008  0.457  0.735  1.0
  Cr  Cr2  1  0.227  0.448  0.492  1.0
  Cr  Cr3  1  0.052  0.278  0.043  1.0
  Cr  Cr4  1  0.278  0.043  0.052  1.0
  Cr  Cr5  1  0.043  0.052  0.278  1.0
  Cr  Cr6  1  0.735  0.008  0.457  1.0
  Cr  Cr7  1  0.492  0.227  0.448  1.0
  Cr  Cr8  1  0.273  0.765  0.222  1.0
  Cr  Cr9  1  0.448  0.492  0.227  1.0
  Cr  Cr10  1  0.222  0.273  0.765  1.0
  Cr  Cr11  1  0.457  0.735  0.008  1.0
  Cr  Cr12  1  0.991  0.546  0.272  1.0
  Cr  Cr13  1  0.781  0.555  0.509  1.0
  Cr  Cr14  1  0.228  0.774  0.719  1.0
  Cr  Cr15  1  0.726  0.954  0.945  1.0
  Cr  Cr16  1  0.954  0.945  0.726  1.0
  Cr  Cr17  1  0.945  0.726  0.954  1.0
  Cr  Cr18  1  0.509  0.781  0.555  1.0
  Cr  Cr19  1  0.719  0.228  0.774  1.0
  Cr  Cr20  1  0.272  0.991  0.546  1.0
  Cr  Cr21  1  0.774  0.719  0.228  1.0
  Cr  Cr22  1  0.546  0.272  0.991  1.0
  Cr  Cr23  1  0.555  0.509  0.781  1.0
  N  N24  1  0.000  0.496  0.500  1.0
  N  N25  1  0.004  0.004  0.004  1.0
  N  N26  1  0.500  0.000  0.496  1.0
  N  N27  1  0.496  0.500  0.000  1.0
  N  N28  1  0.750  0.956  0.206  1.0
  N  N29  1  0.956  0.206  0.750  1.0
  N  N30  1  0.294  0.250  0.544  1.0
  N  N31  1  0.250  0.544  0.294  1.0
  N  N32  1  0.544  0.294  0.250  1.0
  N  N33  1  0.206  0.750  0.956  1.0
  N  N34  1  0.750  0.455  0.705  1.0
  N  N35  1  0.455  0.705  0.750  1.0
  N  N36  1  0.795  0.250  0.045  1.0
  N  N37  1  0.250  0.045  0.795  1.0
  N  N38  1  0.045  0.795  0.250  1.0
  N  N39  1  0.705  0.750  0.455  1.0
[/CIF]
.