The material described by Sr2SiO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(3), and four equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(2), and six equivalent O(1) atoms. Si(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1), three 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), three equivalent Sr(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(2), three equivalent Sr(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Sr2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.613
_cell_length_b   7.083
_cell_length_c   9.814
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   390.155
_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  0.250  0.998  0.697  1.0
  Sr  Sr1  1  0.750  0.002  0.303  1.0
  Sr  Sr2  1  0.250  0.498  0.803  1.0
  Sr  Sr3  1  0.750  0.502  0.197  1.0
  Sr  Sr4  1  0.250  0.655  0.425  1.0
  Sr  Sr5  1  0.750  0.345  0.575  1.0
  Sr  Sr6  1  0.250  0.155  0.075  1.0
  Sr  Sr7  1  0.750  0.845  0.925  1.0
  Si  Si8  1  0.250  0.221  0.419  1.0
  Si  Si9  1  0.750  0.779  0.581  1.0
  Si  Si10  1  0.250  0.721  0.081  1.0
  Si  Si11  1  0.750  0.279  0.919  1.0
  O  O12  1  0.988  0.700  0.657  1.0
  O  O13  1  0.488  0.300  0.343  1.0
  O  O14  1  0.512  0.200  0.843  1.0
  O  O15  1  0.012  0.800  0.157  1.0
  O  O16  1  0.012  0.300  0.343  1.0
  O  O17  1  0.512  0.700  0.657  1.0
  O  O18  1  0.488  0.800  0.157  1.0
  O  O19  1  0.988  0.200  0.843  1.0
  O  O20  1  0.250  0.318  0.572  1.0
  O  O21  1  0.750  0.682  0.428  1.0
  O  O22  1  0.250  0.818  0.928  1.0
  O  O23  1  0.750  0.182  0.072  1.0
  O  O24  1  0.750  0.507  0.927  1.0
  O  O25  1  0.250  0.493  0.073  1.0
  O  O26  1  0.750  0.007  0.573  1.0
  O  O27  1  0.250  0.993  0.427  1.0
[/CIF]
.
The material described by Sr2SiO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(3), and four equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(2), and six equivalent O(1) atoms. Si(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1), three 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), three equivalent Sr(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(2), three equivalent Sr(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Sr2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.613
_cell_length_b   7.083
_cell_length_c   9.814
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   390.155
_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  0.250  0.998  0.697  1.0
  Sr  Sr1  1  0.750  0.002  0.303  1.0
  Sr  Sr2  1  0.250  0.498  0.803  1.0
  Sr  Sr3  1  0.750  0.502  0.197  1.0
  Sr  Sr4  1  0.250  0.655  0.425  1.0
  Sr  Sr5  1  0.750  0.345  0.575  1.0
  Sr  Sr6  1  0.250  0.155  0.075  1.0
  Sr  Sr7  1  0.750  0.845  0.925  1.0
  Si  Si8  1  0.250  0.221  0.419  1.0
  Si  Si9  1  0.750  0.779  0.581  1.0
  Si  Si10  1  0.250  0.721  0.081  1.0
  Si  Si11  1  0.750  0.279  0.919  1.0
  O  O12  1  0.988  0.700  0.657  1.0
  O  O13  1  0.488  0.300  0.343  1.0
  O  O14  1  0.512  0.200  0.843  1.0
  O  O15  1  0.012  0.800  0.157  1.0
  O  O16  1  0.012  0.300  0.343  1.0
  O  O17  1  0.512  0.700  0.657  1.0
  O  O18  1  0.488  0.800  0.157  1.0
  O  O19  1  0.988  0.200  0.843  1.0
  O  O20  1  0.250  0.318  0.572  1.0
  O  O21  1  0.750  0.682  0.428  1.0
  O  O22  1  0.250  0.818  0.928  1.0
  O  O23  1  0.750  0.182  0.072  1.0
  O  O24  1  0.750  0.507  0.927  1.0
  O  O25  1  0.250  0.493  0.073  1.0
  O  O26  1  0.750  0.007  0.573  1.0
  O  O27  1  0.250  0.993  0.427  1.0
[/CIF]
.