The structure described by Sr2Si3 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent Si(1), two equivalent Si(3), and four equivalent Si(2) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to two equivalent Si(2), four equivalent Si(1), and four equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), and one Si(3) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), and two equivalent Si(3) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), one Si(1), and two equivalent Si(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.084
_cell_length_b   8.084
_cell_length_c   8.084
_cell_angle_alpha   151.882
_cell_angle_beta   146.223
_cell_angle_gamma   44.505
_symmetry_Int_Tables_number   1
_cell_volume   138.047
_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  0.747  0.247  0.500  1.0
  Sr  Sr1  1  0.005  0.005  0.000  1.0
  Si  Si2  1  0.578  0.578  0.000  1.0
  Si  Si3  1  0.332  0.832  0.500  1.0
  Si  Si4  1  0.424  0.424  0.000  1.0
[/CIF]
.
The structure described by Sr2Si3 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent Si(1), two equivalent Si(3), and four equivalent Si(2) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to two equivalent Si(2), four equivalent Si(1), and four equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), and one Si(3) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), and two equivalent Si(3) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), one Si(1), and two equivalent Si(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.084
_cell_length_b   8.084
_cell_length_c   8.084
_cell_angle_alpha   151.882
_cell_angle_beta   146.223
_cell_angle_gamma   44.505
_symmetry_Int_Tables_number   1
_cell_volume   138.047
_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  0.747  0.247  0.500  1.0
  Sr  Sr1  1  0.005  0.005  0.000  1.0
  Si  Si2  1  0.578  0.578  0.000  1.0
  Si  Si3  1  0.332  0.832  0.500  1.0
  Si  Si4  1  0.424  0.424  0.000  1.0
[/CIF]
.