The material described by Sr4CrN4 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one N(2), one N(4), and three equivalent N(1) atoms to form a mixture of distorted corner and edge-sharing SrN5 trigonal bipyramids. In the second Sr site, Sr(2) is bonded in a distorted see-saw-like geometry to one N(3), one N(4), and two equivalent N(2) atoms. In the third Sr site, Sr(3) is bonded in a distorted see-saw-like geometry to one N(2), one N(4), and two equivalent N(3) atoms. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one N(1), one N(2), two equivalent N(3), and two equivalent N(4) atoms. Cr(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(3) atom. There are four inequivalent N sites. In the first N site, N(4) is bonded to one Sr(1), one Sr(2), one Sr(3), and two equivalent Sr(4) atoms to form NSr5 trigonal bipyramids that share corners with two equivalent N(2)Sr5Cr octahedra,  a cornercorner with one N(1)Sr4Cr trigonal bipyramid, corners with two equivalent N(4)Sr5 trigonal bipyramids, edges with two equivalent N(2)Sr5Cr octahedra, and edges with two equivalent N(1)Sr4Cr trigonal bipyramids. The corner-sharing octahedral tilt angles range from 55-56°. In the second N site, N(1) is bonded to one Sr(4), three equivalent Sr(1), and one Cr(1) atom to form distorted NSr4Cr trigonal bipyramids that share corners with three equivalent N(2)Sr5Cr octahedra,  a cornercorner with one N(4)Sr5 trigonal bipyramid, corners with two equivalent N(1)Sr4Cr trigonal bipyramids,  an edgeedge with one N(2)Sr5Cr octahedra, edges with two equivalent N(1)Sr4Cr trigonal bipyramids, and edges with two equivalent N(4)Sr5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 26-80°. In the third N site, N(2) is bonded to one Sr(1), one Sr(3), one Sr(4), two equivalent Sr(2), and one Cr(1) atom to form distorted NSr5Cr octahedra that share corners with two equivalent N(2)Sr5Cr octahedra, corners with two equivalent N(4)Sr5 trigonal bipyramids, corners with three equivalent N(1)Sr4Cr trigonal bipyramids,  an edgeedge with one N(1)Sr4Cr trigonal bipyramid, and edges with two equivalent N(4)Sr5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 22°. In the fourth N site, N(3) is bonded in a 1-coordinate geometry to one Sr(2), two equivalent Sr(3), two equivalent Sr(4), and one Cr(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr4CrN4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.849
_cell_length_b   5.259
_cell_length_c   11.669
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   727.125
_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  0.554  0.250  0.890  1.0
  Sr  Sr1  1  0.054  0.250  0.610  1.0
  Sr  Sr2  1  0.446  0.750  0.110  1.0
  Sr  Sr3  1  0.946  0.750  0.390  1.0
  Sr  Sr4  1  0.724  0.250  0.525  1.0
  Sr  Sr5  1  0.224  0.250  0.975  1.0
  Sr  Sr6  1  0.276  0.750  0.475  1.0
  Sr  Sr7  1  0.776  0.750  0.025  1.0
  Sr  Sr8  1  0.865  0.250  0.836  1.0
  Sr  Sr9  1  0.365  0.250  0.664  1.0
  Sr  Sr10  1  0.135  0.750  0.164  1.0
  Sr  Sr11  1  0.635  0.750  0.336  1.0
  Sr  Sr12  1  0.909  0.250  0.186  1.0
  Sr  Sr13  1  0.409  0.250  0.314  1.0
  Sr  Sr14  1  0.091  0.750  0.814  1.0
  Sr  Sr15  1  0.591  0.750  0.686  1.0
  Cr  Cr16  1  0.636  0.250  0.148  1.0
  Cr  Cr17  1  0.136  0.250  0.352  1.0
  Cr  Cr18  1  0.364  0.750  0.852  1.0
  Cr  Cr19  1  0.864  0.750  0.648  1.0
  N  N20  1  0.497  0.250  0.110  1.0
  N  N21  1  0.997  0.250  0.390  1.0
  N  N22  1  0.503  0.750  0.890  1.0
  N  N23  1  0.003  0.750  0.610  1.0
  N  N24  1  0.734  0.250  0.034  1.0
  N  N25  1  0.234  0.250  0.466  1.0
  N  N26  1  0.266  0.750  0.966  1.0
  N  N27  1  0.766  0.750  0.534  1.0
  N  N28  1  0.673  0.250  0.291  1.0
  N  N29  1  0.173  0.250  0.209  1.0
  N  N30  1  0.327  0.750  0.709  1.0
  N  N31  1  0.827  0.750  0.791  1.0
  N  N32  1  0.070  0.250  0.832  1.0
  N  N33  1  0.570  0.250  0.668  1.0
  N  N34  1  0.930  0.750  0.168  1.0
  N  N35  1  0.430  0.750  0.332  1.0
[/CIF]
.
The material described by Sr4CrN4 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one N(2), one N(4), and three equivalent N(1) atoms to form a mixture of distorted corner and edge-sharing SrN5 trigonal bipyramids. In the second Sr site, Sr(2) is bonded in a distorted see-saw-like geometry to one N(3), one N(4), and two equivalent N(2) atoms. In the third Sr site, Sr(3) is bonded in a distorted see-saw-like geometry to one N(2), one N(4), and two equivalent N(3) atoms. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one N(1), one N(2), two equivalent N(3), and two equivalent N(4) atoms. Cr(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(3) atom. There are four inequivalent N sites. In the first N site, N(4) is bonded to one Sr(1), one Sr(2), one Sr(3), and two equivalent Sr(4) atoms to form NSr5 trigonal bipyramids that share corners with two equivalent N(2)Sr5Cr octahedra,  a cornercorner with one N(1)Sr4Cr trigonal bipyramid, corners with two equivalent N(4)Sr5 trigonal bipyramids, edges with two equivalent N(2)Sr5Cr octahedra, and edges with two equivalent N(1)Sr4Cr trigonal bipyramids. The corner-sharing octahedral tilt angles range from 55-56°. In the second N site, N(1) is bonded to one Sr(4), three equivalent Sr(1), and one Cr(1) atom to form distorted NSr4Cr trigonal bipyramids that share corners with three equivalent N(2)Sr5Cr octahedra,  a cornercorner with one N(4)Sr5 trigonal bipyramid, corners with two equivalent N(1)Sr4Cr trigonal bipyramids,  an edgeedge with one N(2)Sr5Cr octahedra, edges with two equivalent N(1)Sr4Cr trigonal bipyramids, and edges with two equivalent N(4)Sr5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 26-80°. In the third N site, N(2) is bonded to one Sr(1), one Sr(3), one Sr(4), two equivalent Sr(2), and one Cr(1) atom to form distorted NSr5Cr octahedra that share corners with two equivalent N(2)Sr5Cr octahedra, corners with two equivalent N(4)Sr5 trigonal bipyramids, corners with three equivalent N(1)Sr4Cr trigonal bipyramids,  an edgeedge with one N(1)Sr4Cr trigonal bipyramid, and edges with two equivalent N(4)Sr5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 22°. In the fourth N site, N(3) is bonded in a 1-coordinate geometry to one Sr(2), two equivalent Sr(3), two equivalent Sr(4), and one Cr(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr4CrN4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.849
_cell_length_b   5.259
_cell_length_c   11.669
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   727.125
_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  0.554  0.250  0.890  1.0
  Sr  Sr1  1  0.054  0.250  0.610  1.0
  Sr  Sr2  1  0.446  0.750  0.110  1.0
  Sr  Sr3  1  0.946  0.750  0.390  1.0
  Sr  Sr4  1  0.724  0.250  0.525  1.0
  Sr  Sr5  1  0.224  0.250  0.975  1.0
  Sr  Sr6  1  0.276  0.750  0.475  1.0
  Sr  Sr7  1  0.776  0.750  0.025  1.0
  Sr  Sr8  1  0.865  0.250  0.836  1.0
  Sr  Sr9  1  0.365  0.250  0.664  1.0
  Sr  Sr10  1  0.135  0.750  0.164  1.0
  Sr  Sr11  1  0.635  0.750  0.336  1.0
  Sr  Sr12  1  0.909  0.250  0.186  1.0
  Sr  Sr13  1  0.409  0.250  0.314  1.0
  Sr  Sr14  1  0.091  0.750  0.814  1.0
  Sr  Sr15  1  0.591  0.750  0.686  1.0
  Cr  Cr16  1  0.636  0.250  0.148  1.0
  Cr  Cr17  1  0.136  0.250  0.352  1.0
  Cr  Cr18  1  0.364  0.750  0.852  1.0
  Cr  Cr19  1  0.864  0.750  0.648  1.0
  N  N20  1  0.497  0.250  0.110  1.0
  N  N21  1  0.997  0.250  0.390  1.0
  N  N22  1  0.503  0.750  0.890  1.0
  N  N23  1  0.003  0.750  0.610  1.0
  N  N24  1  0.734  0.250  0.034  1.0
  N  N25  1  0.234  0.250  0.466  1.0
  N  N26  1  0.266  0.750  0.966  1.0
  N  N27  1  0.766  0.750  0.534  1.0
  N  N28  1  0.673  0.250  0.291  1.0
  N  N29  1  0.173  0.250  0.209  1.0
  N  N30  1  0.327  0.750  0.709  1.0
  N  N31  1  0.827  0.750  0.791  1.0
  N  N32  1  0.070  0.250  0.832  1.0
  N  N33  1  0.570  0.250  0.668  1.0
  N  N34  1  0.930  0.750  0.168  1.0
  N  N35  1  0.430  0.750  0.332  1.0
[/CIF]
.