The structure described by Ce2SiSeO4 crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 6-coordinate geometry to two equivalent Se(1), two equivalent O(2), and four equivalent O(1) atoms. In the second Ce site, Ce(2) is bonded in a 6-coordinate geometry to two equivalent Se(1), two equivalent O(1), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Se(1) is bonded in a 4-coordinate geometry to two equivalent Ce(1) and two equivalent Ce(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ce(1), two equivalent Ce(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_Ce2SiSeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.285
_cell_length_b   7.260
_cell_length_c   11.179
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   510.145
_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
  Ce  Ce0  1  0.132  0.034  0.250  1.0
  Ce  Ce1  1  0.132  0.466  0.750  1.0
  Ce  Ce2  1  0.868  0.534  0.250  1.0
  Ce  Ce3  1  0.868  0.966  0.750  1.0
  Ce  Ce4  1  0.607  0.250  0.000  1.0
  Ce  Ce5  1  0.393  0.750  0.500  1.0
  Ce  Ce6  1  0.393  0.750  0.000  1.0
  Ce  Ce7  1  0.607  0.250  0.500  1.0
  Si  Si8  1  0.113  0.250  0.000  1.0
  Si  Si9  1  0.887  0.750  0.500  1.0
  Si  Si10  1  0.887  0.750  0.000  1.0
  Si  Si11  1  0.113  0.250  0.500  1.0
  Se  Se12  1  0.424  0.389  0.250  1.0
  Se  Se13  1  0.424  0.111  0.750  1.0
  Se  Se14  1  0.576  0.889  0.250  1.0
  Se  Se15  1  0.576  0.611  0.750  1.0
  O  O16  1  0.047  0.766  0.117  1.0
  O  O17  1  0.047  0.734  0.883  1.0
  O  O18  1  0.953  0.266  0.383  1.0
  O  O19  1  0.953  0.234  0.617  1.0
  O  O20  1  0.953  0.234  0.883  1.0
  O  O21  1  0.953  0.266  0.117  1.0
  O  O22  1  0.047  0.734  0.617  1.0
  O  O23  1  0.047  0.766  0.383  1.0
  O  O24  1  0.270  0.075  0.032  1.0
  O  O25  1  0.270  0.425  0.968  1.0
  O  O26  1  0.730  0.575  0.468  1.0
  O  O27  1  0.730  0.925  0.532  1.0
  O  O28  1  0.730  0.925  0.968  1.0
  O  O29  1  0.730  0.575  0.032  1.0
  O  O30  1  0.270  0.425  0.532  1.0
  O  O31  1  0.270  0.075  0.468  1.0
[/CIF]
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The structure described by Ce2SiSeO4 crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 6-coordinate geometry to two equivalent Se(1), two equivalent O(2), and four equivalent O(1) atoms. In the second Ce site, Ce(2) is bonded in a 6-coordinate geometry to two equivalent Se(1), two equivalent O(1), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Se(1) is bonded in a 4-coordinate geometry to two equivalent Ce(1) and two equivalent Ce(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ce(1), two equivalent Ce(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_Ce2SiSeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.285
_cell_length_b   7.260
_cell_length_c   11.179
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   510.145
_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
  Ce  Ce0  1  0.132  0.034  0.250  1.0
  Ce  Ce1  1  0.132  0.466  0.750  1.0
  Ce  Ce2  1  0.868  0.534  0.250  1.0
  Ce  Ce3  1  0.868  0.966  0.750  1.0
  Ce  Ce4  1  0.607  0.250  0.000  1.0
  Ce  Ce5  1  0.393  0.750  0.500  1.0
  Ce  Ce6  1  0.393  0.750  0.000  1.0
  Ce  Ce7  1  0.607  0.250  0.500  1.0
  Si  Si8  1  0.113  0.250  0.000  1.0
  Si  Si9  1  0.887  0.750  0.500  1.0
  Si  Si10  1  0.887  0.750  0.000  1.0
  Si  Si11  1  0.113  0.250  0.500  1.0
  Se  Se12  1  0.424  0.389  0.250  1.0
  Se  Se13  1  0.424  0.111  0.750  1.0
  Se  Se14  1  0.576  0.889  0.250  1.0
  Se  Se15  1  0.576  0.611  0.750  1.0
  O  O16  1  0.047  0.766  0.117  1.0
  O  O17  1  0.047  0.734  0.883  1.0
  O  O18  1  0.953  0.266  0.383  1.0
  O  O19  1  0.953  0.234  0.617  1.0
  O  O20  1  0.953  0.234  0.883  1.0
  O  O21  1  0.953  0.266  0.117  1.0
  O  O22  1  0.047  0.734  0.617  1.0
  O  O23  1  0.047  0.766  0.383  1.0
  O  O24  1  0.270  0.075  0.032  1.0
  O  O25  1  0.270  0.425  0.968  1.0
  O  O26  1  0.730  0.575  0.468  1.0
  O  O27  1  0.730  0.925  0.532  1.0
  O  O28  1  0.730  0.925  0.968  1.0
  O  O29  1  0.730  0.575  0.032  1.0
  O  O30  1  0.270  0.425  0.532  1.0
  O  O31  1  0.270  0.075  0.468  1.0
[/CIF]
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