The material structure described by Eu2SiO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) 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. In the second Eu site, Eu(2) 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. 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 Eu(1), two equivalent Eu(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Eu(1), two equivalent Eu(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Eu(2), three equivalent Eu(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Eu(1), two equivalent Eu(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_Eu2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.080
_cell_length_b   5.656
_cell_length_c   10.917
_cell_angle_alpha   62.435
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   387.507
_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
  Eu  Eu0  1  0.657  0.810  0.424  1.0
  Eu  Eu1  1  0.343  0.190  0.576  1.0
  Eu  Eu2  1  0.500  0.476  0.802  1.0
  Eu  Eu3  1  0.157  0.190  0.076  1.0
  Eu  Eu4  1  1.000  0.476  0.302  1.0
  Eu  Eu5  1  0.000  0.524  0.698  1.0
  Eu  Eu6  1  0.500  0.524  0.198  1.0
  Eu  Eu7  1  0.843  0.810  0.924  1.0
  Si  Si8  1  0.780  0.160  0.582  1.0
  Si  Si9  1  0.280  0.840  0.918  1.0
  Si  Si10  1  0.720  0.160  0.082  1.0
  Si  Si11  1  0.220  0.840  0.418  1.0
  O  O12  1  0.236  0.155  0.818  1.0
  O  O13  1  0.176  0.650  0.861  1.0
  O  O14  1  0.824  0.350  0.139  1.0
  O  O15  1  0.764  0.845  0.182  1.0
  O  O16  1  0.683  0.248  0.429  1.0
  O  O17  1  0.183  0.752  0.071  1.0
  O  O18  1  0.736  0.845  0.682  1.0
  O  O19  1  0.317  0.752  0.571  1.0
  O  O20  1  0.005  0.213  0.569  1.0
  O  O21  1  0.495  0.213  0.069  1.0
  O  O22  1  0.676  0.350  0.639  1.0
  O  O23  1  0.324  0.650  0.361  1.0
  O  O24  1  0.505  0.787  0.931  1.0
  O  O25  1  0.995  0.787  0.431  1.0
  O  O26  1  0.817  0.248  0.929  1.0
  O  O27  1  0.264  0.155  0.318  1.0
[/CIF]
.
The material structure described by Eu2SiO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) 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. In the second Eu site, Eu(2) 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. 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 Eu(1), two equivalent Eu(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Eu(1), two equivalent Eu(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Eu(2), three equivalent Eu(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Eu(1), two equivalent Eu(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_Eu2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.080
_cell_length_b   5.656
_cell_length_c   10.917
_cell_angle_alpha   62.435
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   387.507
_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
  Eu  Eu0  1  0.657  0.810  0.424  1.0
  Eu  Eu1  1  0.343  0.190  0.576  1.0
  Eu  Eu2  1  0.500  0.476  0.802  1.0
  Eu  Eu3  1  0.157  0.190  0.076  1.0
  Eu  Eu4  1  1.000  0.476  0.302  1.0
  Eu  Eu5  1  0.000  0.524  0.698  1.0
  Eu  Eu6  1  0.500  0.524  0.198  1.0
  Eu  Eu7  1  0.843  0.810  0.924  1.0
  Si  Si8  1  0.780  0.160  0.582  1.0
  Si  Si9  1  0.280  0.840  0.918  1.0
  Si  Si10  1  0.720  0.160  0.082  1.0
  Si  Si11  1  0.220  0.840  0.418  1.0
  O  O12  1  0.236  0.155  0.818  1.0
  O  O13  1  0.176  0.650  0.861  1.0
  O  O14  1  0.824  0.350  0.139  1.0
  O  O15  1  0.764  0.845  0.182  1.0
  O  O16  1  0.683  0.248  0.429  1.0
  O  O17  1  0.183  0.752  0.071  1.0
  O  O18  1  0.736  0.845  0.682  1.0
  O  O19  1  0.317  0.752  0.571  1.0
  O  O20  1  0.005  0.213  0.569  1.0
  O  O21  1  0.495  0.213  0.069  1.0
  O  O22  1  0.676  0.350  0.639  1.0
  O  O23  1  0.324  0.650  0.361  1.0
  O  O24  1  0.505  0.787  0.931  1.0
  O  O25  1  0.995  0.787  0.431  1.0
  O  O26  1  0.817  0.248  0.929  1.0
  O  O27  1  0.264  0.155  0.318  1.0
[/CIF]
.