The crystal structure described by Li2Sr6Cr2N8O crystallizes in the triclinic P-1 space group. Li(1) is bonded to one N(3), two equivalent N(4), and one O(1) atom to form distorted LiN3O tetrahedra that share corners with two equivalent Sr(3)N6 pentagonal pyramids,  a cornercorner with one Li(1)N3O tetrahedra,  a cornercorner with one Cr(1)N4 tetrahedra,  an edgeedge with one Li(1)N3O tetrahedra, and  an edgeedge with one Cr(1)N4 tetrahedra. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one N(1), one N(4), two equivalent N(2), two equivalent N(3), and one O(1) atom. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one N(2), two equivalent N(1), two equivalent N(4), and one O(1) atom. In the third Sr site, Sr(3) is bonded to two equivalent N(1), two equivalent N(2), and two equivalent N(3) atoms to form distorted SrN6 pentagonal pyramids that share corners with two equivalent Li(1)N3O tetrahedra, corners with two equivalent Cr(1)N4 tetrahedra, edges with three equivalent Sr(3)N6 pentagonal pyramids, and edges with two equivalent Cr(1)N4 tetrahedra. Cr(1) is bonded to one N(1), one N(2), one N(3), and one N(4) atom to form CrN4 tetrahedra that share corners with two equivalent Sr(3)N6 pentagonal pyramids,  a cornercorner with one Li(1)N3O tetrahedra, edges with two equivalent Sr(3)N6 pentagonal pyramids, and  an edgeedge with one Li(1)N3O tetrahedra. There are four inequivalent N sites. In the first N site, N(1) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one Cr(1) atom to form distorted NSr5Cr octahedra that share  a cornercorner with one O(1)Sr4Li2 octahedra,  an edgeedge with one O(1)Sr4Li2 octahedra, and edges with two equivalent N(1)Sr5Cr octahedra. The corner-sharing octahedral tilt angles are 69°. In the second N site, N(2) is bonded in a 6-coordinate geometry to one Sr(2), two equivalent Sr(1), two equivalent Sr(3), and one Cr(1) atom. In the third N site, N(3) is bonded in a 6-coordinate geometry to one Li(1), two equivalent Sr(1), two equivalent Sr(3), and one Cr(1) atom. In the fourth N site, N(4) is bonded in a 6-coordinate geometry to two equivalent Li(1), one Sr(1), two equivalent Sr(2), and one Cr(1) atom. O(1) is bonded to two equivalent Li(1), two equivalent Sr(1), and two equivalent Sr(2) atoms to form distorted OSr4Li2 octahedra that share corners with two equivalent N(1)Sr5Cr octahedra and edges with two equivalent N(1)Sr5Cr octahedra. The corner-sharing octahedral tilt angles are 69°. is represented by the CIF file [CIF]
data_Sr6Li2Cr2N8O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.211
_cell_length_b   6.870
_cell_length_c   7.601
_cell_angle_alpha   82.299
_cell_angle_beta   75.078
_cell_angle_gamma   69.958
_symmetry_Int_Tables_number   1
_cell_volume   294.058
_cell_formula_units_Z   1
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  0.200  0.379  0.302  1.0
  Sr  Sr1  1  0.293  0.865  0.070  1.0
  Sr  Sr2  1  0.700  0.188  0.468  1.0
  Sr  Sr3  1  0.300  0.812  0.532  1.0
  Sr  Sr4  1  0.707  0.135  0.930  1.0
  Sr  Sr5  1  0.800  0.621  0.698  1.0
  Li  Li6  1  0.225  0.510  0.908  1.0
  Li  Li7  1  0.775  0.490  0.092  1.0
  Cr  Cr8  1  0.788  0.788  0.251  1.0
  Cr  Cr9  1  0.212  0.212  0.749  1.0
  N  N10  1  0.534  0.011  0.265  1.0
  N  N11  1  0.987  0.820  0.365  1.0
  N  N12  1  0.715  0.569  0.358  1.0
  N  N13  1  0.923  0.745  0.021  1.0
  N  N14  1  0.285  0.431  0.642  1.0
  N  N15  1  0.466  0.989  0.735  1.0
  N  N16  1  0.077  0.255  0.979  1.0
  N  N17  1  0.013  0.180  0.635  1.0
  O  O18  1  0.500  0.500  0.000  1.0
[/CIF]
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The crystal structure described by Li2Sr6Cr2N8O crystallizes in the triclinic P-1 space group. Li(1) is bonded to one N(3), two equivalent N(4), and one O(1) atom to form distorted LiN3O tetrahedra that share corners with two equivalent Sr(3)N6 pentagonal pyramids,  a cornercorner with one Li(1)N3O tetrahedra,  a cornercorner with one Cr(1)N4 tetrahedra,  an edgeedge with one Li(1)N3O tetrahedra, and  an edgeedge with one Cr(1)N4 tetrahedra. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one N(1), one N(4), two equivalent N(2), two equivalent N(3), and one O(1) atom. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one N(2), two equivalent N(1), two equivalent N(4), and one O(1) atom. In the third Sr site, Sr(3) is bonded to two equivalent N(1), two equivalent N(2), and two equivalent N(3) atoms to form distorted SrN6 pentagonal pyramids that share corners with two equivalent Li(1)N3O tetrahedra, corners with two equivalent Cr(1)N4 tetrahedra, edges with three equivalent Sr(3)N6 pentagonal pyramids, and edges with two equivalent Cr(1)N4 tetrahedra. Cr(1) is bonded to one N(1), one N(2), one N(3), and one N(4) atom to form CrN4 tetrahedra that share corners with two equivalent Sr(3)N6 pentagonal pyramids,  a cornercorner with one Li(1)N3O tetrahedra, edges with two equivalent Sr(3)N6 pentagonal pyramids, and  an edgeedge with one Li(1)N3O tetrahedra. There are four inequivalent N sites. In the first N site, N(1) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one Cr(1) atom to form distorted NSr5Cr octahedra that share  a cornercorner with one O(1)Sr4Li2 octahedra,  an edgeedge with one O(1)Sr4Li2 octahedra, and edges with two equivalent N(1)Sr5Cr octahedra. The corner-sharing octahedral tilt angles are 69°. In the second N site, N(2) is bonded in a 6-coordinate geometry to one Sr(2), two equivalent Sr(1), two equivalent Sr(3), and one Cr(1) atom. In the third N site, N(3) is bonded in a 6-coordinate geometry to one Li(1), two equivalent Sr(1), two equivalent Sr(3), and one Cr(1) atom. In the fourth N site, N(4) is bonded in a 6-coordinate geometry to two equivalent Li(1), one Sr(1), two equivalent Sr(2), and one Cr(1) atom. O(1) is bonded to two equivalent Li(1), two equivalent Sr(1), and two equivalent Sr(2) atoms to form distorted OSr4Li2 octahedra that share corners with two equivalent N(1)Sr5Cr octahedra and edges with two equivalent N(1)Sr5Cr octahedra. The corner-sharing octahedral tilt angles are 69°. is represented by the CIF file [CIF]
data_Sr6Li2Cr2N8O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.211
_cell_length_b   6.870
_cell_length_c   7.601
_cell_angle_alpha   82.299
_cell_angle_beta   75.078
_cell_angle_gamma   69.958
_symmetry_Int_Tables_number   1
_cell_volume   294.058
_cell_formula_units_Z   1
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  0.200  0.379  0.302  1.0
  Sr  Sr1  1  0.293  0.865  0.070  1.0
  Sr  Sr2  1  0.700  0.188  0.468  1.0
  Sr  Sr3  1  0.300  0.812  0.532  1.0
  Sr  Sr4  1  0.707  0.135  0.930  1.0
  Sr  Sr5  1  0.800  0.621  0.698  1.0
  Li  Li6  1  0.225  0.510  0.908  1.0
  Li  Li7  1  0.775  0.490  0.092  1.0
  Cr  Cr8  1  0.788  0.788  0.251  1.0
  Cr  Cr9  1  0.212  0.212  0.749  1.0
  N  N10  1  0.534  0.011  0.265  1.0
  N  N11  1  0.987  0.820  0.365  1.0
  N  N12  1  0.715  0.569  0.358  1.0
  N  N13  1  0.923  0.745  0.021  1.0
  N  N14  1  0.285  0.431  0.642  1.0
  N  N15  1  0.466  0.989  0.735  1.0
  N  N16  1  0.077  0.255  0.979  1.0
  N  N17  1  0.013  0.180  0.635  1.0
  O  O18  1  0.500  0.500  0.000  1.0
[/CIF]
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