The structure described by Sr2CrN3 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to two equivalent N(1) and three equivalent N(2) atoms. In the second Sr site, Sr(2) is bonded to two equivalent N(2), two equivalent N(3), and three equivalent N(1) atoms to form distorted SrN7 pentagonal bipyramids that share corners with four equivalent Sr(2)N7 pentagonal bipyramids,  a cornercorner with one Cr(1)N4 tetrahedra, edges with three equivalent Sr(2)N7 pentagonal bipyramids, and edges with four equivalent Cr(1)N4 tetrahedra. Cr(1) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form CrN4 tetrahedra that share  a cornercorner with one Sr(2)N7 pentagonal bipyramid, corners with two equivalent Cr(1)N4 tetrahedra, and edges with four equivalent Sr(2)N7 pentagonal bipyramids. There are three inequivalent N sites. In the first N site, N(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(2) and two equivalent Cr(1) atoms. In the second N site, N(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), three equivalent Sr(2), and one Cr(1) atom. In the third N site, N(2) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Cr(1) atom to form a mixture of distorted edge and corner-sharing NSr5Cr octahedra. The corner-sharing octahedral tilt angles are 15°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2CrN3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.155
_cell_length_b   10.951
_cell_length_c   12.285
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   27.184
_symmetry_Int_Tables_number   1
_cell_volume   378.324
_cell_formula_units_Z   4
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
  Sr  Sr0  1  0.000  0.444  0.643  1.0
  Sr  Sr1  1  0.000  0.556  0.357  1.0
  Sr  Sr2  1  0.000  0.056  0.143  1.0
  Sr  Sr3  1  0.000  0.944  0.857  1.0
  Sr  Sr4  1  0.000  0.141  0.578  1.0
  Sr  Sr5  1  0.000  0.859  0.422  1.0
  Sr  Sr6  1  0.000  0.359  0.078  1.0
  Sr  Sr7  1  0.000  0.641  0.922  1.0
  Cr  Cr8  1  0.000  0.255  0.835  1.0
  Cr  Cr9  1  0.000  0.745  0.165  1.0
  Cr  Cr10  1  0.000  0.245  0.335  1.0
  Cr  Cr11  1  0.000  0.755  0.665  1.0
  N  N12  1  0.000  0.160  0.951  1.0
  N  N13  1  0.000  0.840  0.049  1.0
  N  N14  1  0.000  0.340  0.451  1.0
  N  N15  1  0.000  0.660  0.549  1.0
  N  N16  1  0.000  0.412  0.868  1.0
  N  N17  1  0.000  0.588  0.132  1.0
  N  N18  1  0.000  0.088  0.368  1.0
  N  N19  1  0.000  0.912  0.632  1.0
  N  N20  1  0.500  0.472  0.750  1.0
  N  N21  1  0.500  0.028  0.250  1.0
  N  N22  1  0.500  0.528  0.250  1.0
  N  N23  1  0.500  0.972  0.750  1.0
[/CIF]
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The structure described by Sr2CrN3 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to two equivalent N(1) and three equivalent N(2) atoms. In the second Sr site, Sr(2) is bonded to two equivalent N(2), two equivalent N(3), and three equivalent N(1) atoms to form distorted SrN7 pentagonal bipyramids that share corners with four equivalent Sr(2)N7 pentagonal bipyramids,  a cornercorner with one Cr(1)N4 tetrahedra, edges with three equivalent Sr(2)N7 pentagonal bipyramids, and edges with four equivalent Cr(1)N4 tetrahedra. Cr(1) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form CrN4 tetrahedra that share  a cornercorner with one Sr(2)N7 pentagonal bipyramid, corners with two equivalent Cr(1)N4 tetrahedra, and edges with four equivalent Sr(2)N7 pentagonal bipyramids. There are three inequivalent N sites. In the first N site, N(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(2) and two equivalent Cr(1) atoms. In the second N site, N(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), three equivalent Sr(2), and one Cr(1) atom. In the third N site, N(2) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Cr(1) atom to form a mixture of distorted edge and corner-sharing NSr5Cr octahedra. The corner-sharing octahedral tilt angles are 15°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2CrN3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.155
_cell_length_b   10.951
_cell_length_c   12.285
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   27.184
_symmetry_Int_Tables_number   1
_cell_volume   378.324
_cell_formula_units_Z   4
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
  Sr  Sr0  1  0.000  0.444  0.643  1.0
  Sr  Sr1  1  0.000  0.556  0.357  1.0
  Sr  Sr2  1  0.000  0.056  0.143  1.0
  Sr  Sr3  1  0.000  0.944  0.857  1.0
  Sr  Sr4  1  0.000  0.141  0.578  1.0
  Sr  Sr5  1  0.000  0.859  0.422  1.0
  Sr  Sr6  1  0.000  0.359  0.078  1.0
  Sr  Sr7  1  0.000  0.641  0.922  1.0
  Cr  Cr8  1  0.000  0.255  0.835  1.0
  Cr  Cr9  1  0.000  0.745  0.165  1.0
  Cr  Cr10  1  0.000  0.245  0.335  1.0
  Cr  Cr11  1  0.000  0.755  0.665  1.0
  N  N12  1  0.000  0.160  0.951  1.0
  N  N13  1  0.000  0.840  0.049  1.0
  N  N14  1  0.000  0.340  0.451  1.0
  N  N15  1  0.000  0.660  0.549  1.0
  N  N16  1  0.000  0.412  0.868  1.0
  N  N17  1  0.000  0.588  0.132  1.0
  N  N18  1  0.000  0.088  0.368  1.0
  N  N19  1  0.000  0.912  0.632  1.0
  N  N20  1  0.500  0.472  0.750  1.0
  N  N21  1  0.500  0.028  0.250  1.0
  N  N22  1  0.500  0.528  0.250  1.0
  N  N23  1  0.500  0.972  0.750  1.0
[/CIF]
.