The material structure described by Sr2CeO4 crystallizes in the orthorhombic Pbam space group. Sr(1) is bonded in a 7-coordinate geometry to three equivalent O(1) and four equivalent O(2) atoms. Ce(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form edge-sharing CeO6 octahedra. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Sr(1) and one Ce(1) atom to form distorted OSr4Ce trigonal bipyramids that share corners with four equivalent O(1)Sr3Ce2 trigonal bipyramids, corners with five equivalent O(2)Sr4Ce trigonal bipyramids, edges with four equivalent O(2)Sr4Ce trigonal bipyramids, and edges with six equivalent O(1)Sr3Ce2 trigonal bipyramids. In the second O site, O(1) is bonded to three equivalent Sr(1) and two equivalent Ce(1) atoms to form distorted OSr3Ce2 trigonal bipyramids that share corners with four equivalent O(2)Sr4Ce trigonal bipyramids, corners with eight equivalent O(1)Sr3Ce2 trigonal bipyramids, edges with two equivalent O(1)Sr3Ce2 trigonal bipyramids, and edges with six equivalent O(2)Sr4Ce trigonal bipyramids. is represented by the CIF file [CIF]
data_Sr2CeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.618
_cell_length_b   6.124
_cell_length_c   10.345
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   229.239
_cell_formula_units_Z   2
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  0.436  0.179  1.0
  Sr  Sr1  1  0.500  0.564  0.821  1.0
  Sr  Sr2  1  0.500  0.936  0.321  1.0
  Sr  Sr3  1  0.500  0.064  0.679  1.0
  Ce  Ce4  1  0.000  0.500  0.500  1.0
  Ce  Ce5  1  0.000  0.000  0.000  1.0
  O  O6  1  0.500  0.274  0.457  1.0
  O  O7  1  0.500  0.726  0.543  1.0
  O  O8  1  0.500  0.774  0.043  1.0
  O  O9  1  0.500  0.226  0.957  1.0
  O  O10  1  0.000  0.643  0.306  1.0
  O  O11  1  0.000  0.357  0.694  1.0
  O  O12  1  0.000  0.857  0.806  1.0
  O  O13  1  0.000  0.143  0.194  1.0
[/CIF]
.
The material structure described by Sr2CeO4 crystallizes in the orthorhombic Pbam space group. Sr(1) is bonded in a 7-coordinate geometry to three equivalent O(1) and four equivalent O(2) atoms. Ce(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form edge-sharing CeO6 octahedra. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Sr(1) and one Ce(1) atom to form distorted OSr4Ce trigonal bipyramids that share corners with four equivalent O(1)Sr3Ce2 trigonal bipyramids, corners with five equivalent O(2)Sr4Ce trigonal bipyramids, edges with four equivalent O(2)Sr4Ce trigonal bipyramids, and edges with six equivalent O(1)Sr3Ce2 trigonal bipyramids. In the second O site, O(1) is bonded to three equivalent Sr(1) and two equivalent Ce(1) atoms to form distorted OSr3Ce2 trigonal bipyramids that share corners with four equivalent O(2)Sr4Ce trigonal bipyramids, corners with eight equivalent O(1)Sr3Ce2 trigonal bipyramids, edges with two equivalent O(1)Sr3Ce2 trigonal bipyramids, and edges with six equivalent O(2)Sr4Ce trigonal bipyramids. is represented by the CIF file [CIF]
data_Sr2CeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.618
_cell_length_b   6.124
_cell_length_c   10.345
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   229.239
_cell_formula_units_Z   2
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  0.436  0.179  1.0
  Sr  Sr1  1  0.500  0.564  0.821  1.0
  Sr  Sr2  1  0.500  0.936  0.321  1.0
  Sr  Sr3  1  0.500  0.064  0.679  1.0
  Ce  Ce4  1  0.000  0.500  0.500  1.0
  Ce  Ce5  1  0.000  0.000  0.000  1.0
  O  O6  1  0.500  0.274  0.457  1.0
  O  O7  1  0.500  0.726  0.543  1.0
  O  O8  1  0.500  0.774  0.043  1.0
  O  O9  1  0.500  0.226  0.957  1.0
  O  O10  1  0.000  0.643  0.306  1.0
  O  O11  1  0.000  0.357  0.694  1.0
  O  O12  1  0.000  0.857  0.806  1.0
  O  O13  1  0.000  0.143  0.194  1.0
[/CIF]
.