The crystal structure described by CrN2 is Keatite-like structured and crystallizes in the monoclinic C2/m space group. There are seven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to one N(1), one N(2), and two equivalent N(5) atoms to form corner-sharing CrN4 tetrahedra. In the third Cr site, Cr(3) is bonded to one N(4), one N(6), and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one N(10), one N(9), and two equivalent N(5) atoms to form corner-sharing CrN4 tetrahedra. In the fifth Cr site, Cr(5) is bonded to one N(10), one N(4), and two equivalent N(8) atoms to form corner-sharing CrN4 tetrahedra. In the sixth Cr site, Cr(6) is bonded to one N(11), one N(9), and two equivalent N(8) atoms to form corner-sharing CrN4 tetrahedra. In the seventh Cr site, Cr(7) is bonded to one N(11), one N(6), and two equivalent N(7) atoms to form corner-sharing CrN4 tetrahedra. There are eleven inequivalent N sites. In the first N site, N(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(3) atom. In the second N site, N(4) is bonded in a linear geometry to one Cr(3) and one Cr(5) atom. In the third N site, N(5) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(4) atom. In the fourth N site, N(6) is bonded in a bent 150 degrees geometry to one Cr(3) and one Cr(7) atom. In the fifth N site, N(7) is bonded in a linear geometry to two equivalent Cr(7) atoms. In the sixth N site, N(8) is bonded in a bent 150 degrees geometry to one Cr(5) and one Cr(6) atom. In the seventh N site, N(9) is bonded in a bent 150 degrees geometry to one Cr(4) and one Cr(6) atom. In the eighth N site, N(10) is bonded in a linear geometry to one Cr(4) and one Cr(5) atom. In the ninth N site, N(11) is bonded in a linear geometry to one Cr(6) and one Cr(7) atom. In the tenth N site, N(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the eleventh N site, N(2) is bonded in a linear geometry to one Cr(1) and one Cr(2) atom. is represented by the CIF card [CIF]
data_CrN2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.060
_cell_length_b   14.060
_cell_length_c   13.032
_cell_angle_alpha   71.093
_cell_angle_beta   71.093
_cell_angle_gamma   23.424
_symmetry_Int_Tables_number   1
_cell_volume   966.390
_cell_formula_units_Z   14
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  0.930  0.930  0.168  1.0
  Cr  Cr1  1  0.070  0.070  0.832  1.0
  Cr  Cr2  1  0.938  0.938  0.908  1.0
  Cr  Cr3  1  0.062  0.062  0.092  1.0
  Cr  Cr4  1  0.630  0.630  0.712  1.0
  Cr  Cr5  1  0.370  0.370  0.288  1.0
  Cr  Cr6  1  0.622  0.622  0.121  1.0
  Cr  Cr7  1  0.378  0.378  0.879  1.0
  Cr  Cr8  1  0.710  0.710  0.863  1.0
  Cr  Cr9  1  0.290  0.290  0.137  1.0
  Cr  Cr10  1  0.721  0.721  0.214  1.0
  Cr  Cr11  1  0.279  0.279  0.786  1.0
  Cr  Cr12  1  0.719  0.719  0.479  1.0
  Cr  Cr13  1  0.281  0.281  0.521  1.0
  N  N14  1  0.915  0.915  0.048  1.0
  N  N15  1  0.085  0.085  0.952  1.0
  N  N16  1  0.995  0.995  0.135  1.0
  N  N17  1  0.005  0.005  0.865  1.0
  N  N18  1  0.150  0.660  0.246  1.0
  N  N19  1  0.660  0.150  0.246  1.0
  N  N20  1  0.850  0.340  0.754  1.0
  N  N21  1  0.340  0.850  0.754  1.0
  N  N22  1  0.677  0.677  0.771  1.0
  N  N23  1  0.323  0.323  0.229  1.0
  N  N24  1  0.330  0.839  0.138  1.0
  N  N25  1  0.839  0.330  0.138  1.0
  N  N26  1  0.670  0.161  0.862  1.0
  N  N27  1  0.161  0.670  0.862  1.0
  N  N28  1  0.657  0.657  0.572  1.0
  N  N29  1  0.343  0.343  0.428  1.0
  N  N30  1  0.000  0.500  0.500  1.0
  N  N31  1  0.500  0.000  0.500  1.0
  N  N32  1  0.000  0.510  0.150  1.0
  N  N33  1  0.510  0.000  0.150  1.0
  N  N34  1  1.000  0.490  0.850  1.0
  N  N35  1  0.490  1.000  0.850  1.0
  N  N36  1  0.659  0.659  0.205  1.0
  N  N37  1  0.341  0.341  0.795  1.0
  N  N38  1  0.662  0.662  0.992  1.0
  N  N39  1  0.338  0.338  0.008  1.0
  N  N40  1  0.716  0.716  0.348  1.0
  N  N41  1  0.284  0.284  0.652  1.0
[/CIF]
.
The crystal structure described by CrN2 is Keatite-like structured and crystallizes in the monoclinic C2/m space group. There are seven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to one N(1), one N(2), and two equivalent N(5) atoms to form corner-sharing CrN4 tetrahedra. In the third Cr site, Cr(3) is bonded to one N(4), one N(6), and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one N(10), one N(9), and two equivalent N(5) atoms to form corner-sharing CrN4 tetrahedra. In the fifth Cr site, Cr(5) is bonded to one N(10), one N(4), and two equivalent N(8) atoms to form corner-sharing CrN4 tetrahedra. In the sixth Cr site, Cr(6) is bonded to one N(11), one N(9), and two equivalent N(8) atoms to form corner-sharing CrN4 tetrahedra. In the seventh Cr site, Cr(7) is bonded to one N(11), one N(6), and two equivalent N(7) atoms to form corner-sharing CrN4 tetrahedra. There are eleven inequivalent N sites. In the first N site, N(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(3) atom. In the second N site, N(4) is bonded in a linear geometry to one Cr(3) and one Cr(5) atom. In the third N site, N(5) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(4) atom. In the fourth N site, N(6) is bonded in a bent 150 degrees geometry to one Cr(3) and one Cr(7) atom. In the fifth N site, N(7) is bonded in a linear geometry to two equivalent Cr(7) atoms. In the sixth N site, N(8) is bonded in a bent 150 degrees geometry to one Cr(5) and one Cr(6) atom. In the seventh N site, N(9) is bonded in a bent 150 degrees geometry to one Cr(4) and one Cr(6) atom. In the eighth N site, N(10) is bonded in a linear geometry to one Cr(4) and one Cr(5) atom. In the ninth N site, N(11) is bonded in a linear geometry to one Cr(6) and one Cr(7) atom. In the tenth N site, N(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the eleventh N site, N(2) is bonded in a linear geometry to one Cr(1) and one Cr(2) atom. is represented by the CIF card [CIF]
data_CrN2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.060
_cell_length_b   14.060
_cell_length_c   13.032
_cell_angle_alpha   71.093
_cell_angle_beta   71.093
_cell_angle_gamma   23.424
_symmetry_Int_Tables_number   1
_cell_volume   966.390
_cell_formula_units_Z   14
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  0.930  0.930  0.168  1.0
  Cr  Cr1  1  0.070  0.070  0.832  1.0
  Cr  Cr2  1  0.938  0.938  0.908  1.0
  Cr  Cr3  1  0.062  0.062  0.092  1.0
  Cr  Cr4  1  0.630  0.630  0.712  1.0
  Cr  Cr5  1  0.370  0.370  0.288  1.0
  Cr  Cr6  1  0.622  0.622  0.121  1.0
  Cr  Cr7  1  0.378  0.378  0.879  1.0
  Cr  Cr8  1  0.710  0.710  0.863  1.0
  Cr  Cr9  1  0.290  0.290  0.137  1.0
  Cr  Cr10  1  0.721  0.721  0.214  1.0
  Cr  Cr11  1  0.279  0.279  0.786  1.0
  Cr  Cr12  1  0.719  0.719  0.479  1.0
  Cr  Cr13  1  0.281  0.281  0.521  1.0
  N  N14  1  0.915  0.915  0.048  1.0
  N  N15  1  0.085  0.085  0.952  1.0
  N  N16  1  0.995  0.995  0.135  1.0
  N  N17  1  0.005  0.005  0.865  1.0
  N  N18  1  0.150  0.660  0.246  1.0
  N  N19  1  0.660  0.150  0.246  1.0
  N  N20  1  0.850  0.340  0.754  1.0
  N  N21  1  0.340  0.850  0.754  1.0
  N  N22  1  0.677  0.677  0.771  1.0
  N  N23  1  0.323  0.323  0.229  1.0
  N  N24  1  0.330  0.839  0.138  1.0
  N  N25  1  0.839  0.330  0.138  1.0
  N  N26  1  0.670  0.161  0.862  1.0
  N  N27  1  0.161  0.670  0.862  1.0
  N  N28  1  0.657  0.657  0.572  1.0
  N  N29  1  0.343  0.343  0.428  1.0
  N  N30  1  0.000  0.500  0.500  1.0
  N  N31  1  0.500  0.000  0.500  1.0
  N  N32  1  0.000  0.510  0.150  1.0
  N  N33  1  0.510  0.000  0.150  1.0
  N  N34  1  1.000  0.490  0.850  1.0
  N  N35  1  0.490  1.000  0.850  1.0
  N  N36  1  0.659  0.659  0.205  1.0
  N  N37  1  0.341  0.341  0.795  1.0
  N  N38  1  0.662  0.662  0.992  1.0
  N  N39  1  0.338  0.338  0.008  1.0
  N  N40  1  0.716  0.716  0.348  1.0
  N  N41  1  0.284  0.284  0.652  1.0
[/CIF]
.