The structure described by Sr3(NbN2)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted SrN4 trigonal pyramids that share corners with two equivalent Sr(1)N4 trigonal pyramids, corners with four equivalent Nb(1)N4 trigonal pyramids,  an edgeedge with one Sr(1)N4 trigonal pyramid, and edges with two equivalent Nb(1)N4 trigonal pyramids. In the second Sr site, Sr(2) is bonded in a bent 150 degrees geometry to two equivalent N(1) atoms. Nb(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted NbN4 trigonal pyramids that share corners with two equivalent Nb(1)N4 trigonal pyramids, corners with four equivalent Sr(1)N4 trigonal pyramids,  an edgeedge with one Nb(1)N4 trigonal pyramid, and edges with two equivalent Sr(1)N4 trigonal pyramids. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Sr(2), two equivalent Sr(1), and two equivalent Nb(1) atoms to form NSr3Nb2 trigonal bipyramids that share corners with three equivalent N(1)Sr3Nb2 trigonal bipyramids, corners with four equivalent N(2)Sr2Nb2 trigonal pyramids,  an edgeedge with one N(1)Sr3Nb2 trigonal bipyramid, and edges with two equivalent N(2)Sr2Nb2 trigonal pyramids. In the second N site, N(2) is bonded to two equivalent Sr(1) and two equivalent Nb(1) atoms to form NSr2Nb2 trigonal pyramids that share corners with four equivalent N(1)Sr3Nb2 trigonal bipyramids, corners with two equivalent N(2)Sr2Nb2 trigonal pyramids, edges with two equivalent N(1)Sr3Nb2 trigonal bipyramids, and  an edgeedge with one N(2)Sr2Nb2 trigonal pyramid. is represented by the CIF file [CIF]
data_Sr3(NbN2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.561
_cell_length_b   8.328
_cell_length_c   6.177
_cell_angle_alpha   90.000
_cell_angle_beta   70.006
_cell_angle_gamma   115.819
_symmetry_Int_Tables_number   1
_cell_volume   409.585
_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
  Sr  Sr0  1  0.281  0.991  0.076  1.0
  Sr  Sr1  1  0.719  0.710  0.424  1.0
  Sr  Sr2  1  0.719  0.009  0.924  1.0
  Sr  Sr3  1  0.281  0.290  0.576  1.0
  Sr  Sr4  1  0.000  0.755  0.750  1.0
  Sr  Sr5  1  0.000  0.245  0.250  1.0
  Nb  Nb6  1  0.583  0.182  0.525  1.0
  Nb  Nb7  1  0.417  0.599  0.975  1.0
  Nb  Nb8  1  0.417  0.818  0.475  1.0
  Nb  Nb9  1  0.583  0.401  0.025  1.0
  N  N10  1  0.330  0.996  0.627  1.0
  N  N11  1  0.670  0.666  0.873  1.0
  N  N12  1  0.670  0.004  0.373  1.0
  N  N13  1  0.330  0.334  0.127  1.0
  N  N14  1  0.604  0.216  0.831  1.0
  N  N15  1  0.396  0.612  0.669  1.0
  N  N16  1  0.396  0.784  0.169  1.0
  N  N17  1  0.604  0.388  0.331  1.0
[/CIF]
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The structure described by Sr3(NbN2)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted SrN4 trigonal pyramids that share corners with two equivalent Sr(1)N4 trigonal pyramids, corners with four equivalent Nb(1)N4 trigonal pyramids,  an edgeedge with one Sr(1)N4 trigonal pyramid, and edges with two equivalent Nb(1)N4 trigonal pyramids. In the second Sr site, Sr(2) is bonded in a bent 150 degrees geometry to two equivalent N(1) atoms. Nb(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted NbN4 trigonal pyramids that share corners with two equivalent Nb(1)N4 trigonal pyramids, corners with four equivalent Sr(1)N4 trigonal pyramids,  an edgeedge with one Nb(1)N4 trigonal pyramid, and edges with two equivalent Sr(1)N4 trigonal pyramids. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Sr(2), two equivalent Sr(1), and two equivalent Nb(1) atoms to form NSr3Nb2 trigonal bipyramids that share corners with three equivalent N(1)Sr3Nb2 trigonal bipyramids, corners with four equivalent N(2)Sr2Nb2 trigonal pyramids,  an edgeedge with one N(1)Sr3Nb2 trigonal bipyramid, and edges with two equivalent N(2)Sr2Nb2 trigonal pyramids. In the second N site, N(2) is bonded to two equivalent Sr(1) and two equivalent Nb(1) atoms to form NSr2Nb2 trigonal pyramids that share corners with four equivalent N(1)Sr3Nb2 trigonal bipyramids, corners with two equivalent N(2)Sr2Nb2 trigonal pyramids, edges with two equivalent N(1)Sr3Nb2 trigonal bipyramids, and  an edgeedge with one N(2)Sr2Nb2 trigonal pyramid. is represented by the CIF file [CIF]
data_Sr3(NbN2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.561
_cell_length_b   8.328
_cell_length_c   6.177
_cell_angle_alpha   90.000
_cell_angle_beta   70.006
_cell_angle_gamma   115.819
_symmetry_Int_Tables_number   1
_cell_volume   409.585
_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
  Sr  Sr0  1  0.281  0.991  0.076  1.0
  Sr  Sr1  1  0.719  0.710  0.424  1.0
  Sr  Sr2  1  0.719  0.009  0.924  1.0
  Sr  Sr3  1  0.281  0.290  0.576  1.0
  Sr  Sr4  1  0.000  0.755  0.750  1.0
  Sr  Sr5  1  0.000  0.245  0.250  1.0
  Nb  Nb6  1  0.583  0.182  0.525  1.0
  Nb  Nb7  1  0.417  0.599  0.975  1.0
  Nb  Nb8  1  0.417  0.818  0.475  1.0
  Nb  Nb9  1  0.583  0.401  0.025  1.0
  N  N10  1  0.330  0.996  0.627  1.0
  N  N11  1  0.670  0.666  0.873  1.0
  N  N12  1  0.670  0.004  0.373  1.0
  N  N13  1  0.330  0.334  0.127  1.0
  N  N14  1  0.604  0.216  0.831  1.0
  N  N15  1  0.396  0.612  0.669  1.0
  N  N16  1  0.396  0.784  0.169  1.0
  N  N17  1  0.604  0.388  0.331  1.0
[/CIF]
.