The crystal structure described by Sr2Si5N8 is Chalcostibite-like structured and crystallizes in the orthorhombic Pmn2_1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one N(1), one N(6), two equivalent N(2), two equivalent N(4), and four equivalent N(5) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one N(2), one N(3), two equivalent N(5), and two equivalent N(6) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(2), one N(3), and two equivalent N(4) atoms to form corner-sharing SiN4 tetrahedra. In the second Si site, Si(2) is bonded to one N(1), one N(6), and two equivalent N(4) atoms to form corner-sharing SiN4 tetrahedra. In the third Si site, Si(3) is bonded to one N(2), one N(6), and two equivalent N(5) atoms to form corner-sharing SiN4 tetrahedra. In the fourth Si site, Si(4) is bonded to one N(1), one N(3), one N(4), and one N(5) atom to form corner-sharing SiN4 tetrahedra. There are six inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Si(2), and two equivalent Si(4) atoms. In the second N site, N(2) is bonded in a 5-coordinate geometry to one Sr(2), two equivalent Sr(1), one Si(1), and one Si(3) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Sr(2), one Si(1), and two equivalent Si(4) atoms. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Sr(1), one Si(1), one Si(2), and one Si(4) atom. In the fifth N site, N(5) is bonded in a 2-coordinate geometry to one Sr(2), two equivalent Sr(1), one Si(3), and one Si(4) atom. In the sixth N site, N(6) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one Si(2), and one Si(3) atom. is represented by the CIF card [CIF]
data_Sr2Si5N8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.708
_cell_length_b   6.839
_cell_length_c   9.331
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   364.244
_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  0.500  0.117  0.868  1.0
  Sr  Sr1  1  0.000  0.883  0.368  1.0
  Sr  Sr2  1  0.500  0.129  0.500  1.0
  Sr  Sr3  1  0.000  0.871  1.000  1.0
  Si  Si4  1  0.500  0.598  0.402  1.0
  Si  Si5  1  0.000  0.402  0.902  1.0
  Si  Si6  1  0.500  0.580  0.961  1.0
  Si  Si7  1  0.000  0.420  0.461  1.0
  Si  Si8  1  0.500  0.945  0.177  1.0
  Si  Si9  1  0.000  0.055  0.677  1.0
  Si  Si10  1  0.752  0.333  0.183  1.0
  Si  Si11  1  0.748  0.667  0.683  1.0
  Si  Si12  1  0.248  0.333  0.183  1.0
  Si  Si13  1  0.252  0.667  0.683  1.0
  N  N14  1  0.500  0.575  0.772  1.0
  N  N15  1  0.000  0.425  0.272  1.0
  N  N16  1  0.500  0.825  0.338  1.0
  N  N17  1  0.000  0.175  0.838  1.0
  N  N18  1  0.500  0.414  0.273  1.0
  N  N19  1  0.000  0.586  0.773  1.0
  N  N20  1  0.749  0.556  0.511  1.0
  N  N21  1  0.751  0.444  0.011  1.0
  N  N22  1  0.251  0.556  0.511  1.0
  N  N23  1  0.249  0.444  0.011  1.0
  N  N24  1  0.747  0.087  0.172  1.0
  N  N25  1  0.753  0.913  0.672  1.0
  N  N26  1  0.253  0.087  0.172  1.0
  N  N27  1  0.247  0.913  0.672  1.0
  N  N28  1  0.000  0.191  0.522  1.0
  N  N29  1  0.500  0.809  0.022  1.0
[/CIF]
.
The crystal structure described by Sr2Si5N8 is Chalcostibite-like structured and crystallizes in the orthorhombic Pmn2_1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one N(1), one N(6), two equivalent N(2), two equivalent N(4), and four equivalent N(5) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one N(2), one N(3), two equivalent N(5), and two equivalent N(6) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(2), one N(3), and two equivalent N(4) atoms to form corner-sharing SiN4 tetrahedra. In the second Si site, Si(2) is bonded to one N(1), one N(6), and two equivalent N(4) atoms to form corner-sharing SiN4 tetrahedra. In the third Si site, Si(3) is bonded to one N(2), one N(6), and two equivalent N(5) atoms to form corner-sharing SiN4 tetrahedra. In the fourth Si site, Si(4) is bonded to one N(1), one N(3), one N(4), and one N(5) atom to form corner-sharing SiN4 tetrahedra. There are six inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Si(2), and two equivalent Si(4) atoms. In the second N site, N(2) is bonded in a 5-coordinate geometry to one Sr(2), two equivalent Sr(1), one Si(1), and one Si(3) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Sr(2), one Si(1), and two equivalent Si(4) atoms. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Sr(1), one Si(1), one Si(2), and one Si(4) atom. In the fifth N site, N(5) is bonded in a 2-coordinate geometry to one Sr(2), two equivalent Sr(1), one Si(3), and one Si(4) atom. In the sixth N site, N(6) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one Si(2), and one Si(3) atom. is represented by the CIF card [CIF]
data_Sr2Si5N8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.708
_cell_length_b   6.839
_cell_length_c   9.331
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   364.244
_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  0.500  0.117  0.868  1.0
  Sr  Sr1  1  0.000  0.883  0.368  1.0
  Sr  Sr2  1  0.500  0.129  0.500  1.0
  Sr  Sr3  1  0.000  0.871  1.000  1.0
  Si  Si4  1  0.500  0.598  0.402  1.0
  Si  Si5  1  0.000  0.402  0.902  1.0
  Si  Si6  1  0.500  0.580  0.961  1.0
  Si  Si7  1  0.000  0.420  0.461  1.0
  Si  Si8  1  0.500  0.945  0.177  1.0
  Si  Si9  1  0.000  0.055  0.677  1.0
  Si  Si10  1  0.752  0.333  0.183  1.0
  Si  Si11  1  0.748  0.667  0.683  1.0
  Si  Si12  1  0.248  0.333  0.183  1.0
  Si  Si13  1  0.252  0.667  0.683  1.0
  N  N14  1  0.500  0.575  0.772  1.0
  N  N15  1  0.000  0.425  0.272  1.0
  N  N16  1  0.500  0.825  0.338  1.0
  N  N17  1  0.000  0.175  0.838  1.0
  N  N18  1  0.500  0.414  0.273  1.0
  N  N19  1  0.000  0.586  0.773  1.0
  N  N20  1  0.749  0.556  0.511  1.0
  N  N21  1  0.751  0.444  0.011  1.0
  N  N22  1  0.251  0.556  0.511  1.0
  N  N23  1  0.249  0.444  0.011  1.0
  N  N24  1  0.747  0.087  0.172  1.0
  N  N25  1  0.753  0.913  0.672  1.0
  N  N26  1  0.253  0.087  0.172  1.0
  N  N27  1  0.247  0.913  0.672  1.0
  N  N28  1  0.000  0.191  0.522  1.0
  N  N29  1  0.500  0.809  0.022  1.0
[/CIF]
.