The structure described by Sr2SiO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and three equivalent O(3) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Sr(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Sr(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Sr(1), three equivalent Sr(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.097
_cell_length_b   5.681
_cell_length_c   11.014
_cell_angle_alpha   62.138
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   392.563
_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  0.500  0.029  0.197  1.0
  Sr  Sr1  1  1.000  0.971  0.303  1.0
  Sr  Sr2  1  0.500  0.971  0.803  1.0
  Sr  Sr3  1  0.000  0.029  0.697  1.0
  Sr  Sr4  1  0.158  0.313  0.923  1.0
  Sr  Sr5  1  0.658  0.687  0.577  1.0
  Sr  Sr6  1  0.842  0.687  0.077  1.0
  Sr  Sr7  1  0.342  0.313  0.423  1.0
  Si  Si8  1  0.721  0.340  0.918  1.0
  Si  Si9  1  0.221  0.660  0.582  1.0
  Si  Si10  1  0.279  0.660  0.082  1.0
  Si  Si11  1  0.779  0.340  0.418  1.0
  O  O12  1  0.768  0.655  0.822  1.0
  O  O13  1  0.268  0.345  0.678  1.0
  O  O14  1  0.232  0.345  0.178  1.0
  O  O15  1  0.732  0.655  0.322  1.0
  O  O16  1  0.822  0.156  0.858  1.0
  O  O17  1  0.322  0.844  0.642  1.0
  O  O18  1  0.178  0.844  0.142  1.0
  O  O19  1  0.678  0.156  0.358  1.0
  O  O20  1  0.819  0.243  0.070  1.0
  O  O21  1  0.319  0.757  0.430  1.0
  O  O22  1  0.181  0.757  0.930  1.0
  O  O23  1  0.681  0.243  0.570  1.0
  O  O24  1  0.004  0.291  0.430  1.0
  O  O25  1  0.504  0.709  0.070  1.0
  O  O26  1  0.996  0.709  0.570  1.0
  O  O27  1  0.496  0.291  0.930  1.0
[/CIF]
.
The structure described by Sr2SiO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and three equivalent O(3) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Sr(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Sr(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Sr(1), three equivalent Sr(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.097
_cell_length_b   5.681
_cell_length_c   11.014
_cell_angle_alpha   62.138
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   392.563
_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  0.500  0.029  0.197  1.0
  Sr  Sr1  1  1.000  0.971  0.303  1.0
  Sr  Sr2  1  0.500  0.971  0.803  1.0
  Sr  Sr3  1  0.000  0.029  0.697  1.0
  Sr  Sr4  1  0.158  0.313  0.923  1.0
  Sr  Sr5  1  0.658  0.687  0.577  1.0
  Sr  Sr6  1  0.842  0.687  0.077  1.0
  Sr  Sr7  1  0.342  0.313  0.423  1.0
  Si  Si8  1  0.721  0.340  0.918  1.0
  Si  Si9  1  0.221  0.660  0.582  1.0
  Si  Si10  1  0.279  0.660  0.082  1.0
  Si  Si11  1  0.779  0.340  0.418  1.0
  O  O12  1  0.768  0.655  0.822  1.0
  O  O13  1  0.268  0.345  0.678  1.0
  O  O14  1  0.232  0.345  0.178  1.0
  O  O15  1  0.732  0.655  0.322  1.0
  O  O16  1  0.822  0.156  0.858  1.0
  O  O17  1  0.322  0.844  0.642  1.0
  O  O18  1  0.178  0.844  0.142  1.0
  O  O19  1  0.678  0.156  0.358  1.0
  O  O20  1  0.819  0.243  0.070  1.0
  O  O21  1  0.319  0.757  0.430  1.0
  O  O22  1  0.181  0.757  0.930  1.0
  O  O23  1  0.681  0.243  0.570  1.0
  O  O24  1  0.004  0.291  0.430  1.0
  O  O25  1  0.504  0.709  0.070  1.0
  O  O26  1  0.996  0.709  0.570  1.0
  O  O27  1  0.496  0.291  0.930  1.0
[/CIF]
.