The material structure described by Rb2Ce2Fe4O9 crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded in a 10-coordinate geometry to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(7) atoms. Ce(1) is bonded in a body-centered cubic geometry to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(7), two equivalent O(1), and two equivalent O(3) atoms to form distorted corner-sharing FeO5 trigonal bipyramids. In the second Fe site, Fe(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(4) atoms. In the third Fe site, Fe(3) is bonded to one O(7), two equivalent O(2), and two equivalent O(5) atoms to form distorted corner-sharing FeO5 trigonal bipyramids. In the fourth Fe site, Fe(4) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), one Fe(1), and one Fe(4) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), one Fe(2), and one Fe(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), and two equivalent Fe(1) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), and two equivalent Fe(2) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), and two equivalent Fe(3) atoms. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), and two equivalent Fe(4) atoms. In the seventh O site, O(7) is bonded to four equivalent Rb(1), one Fe(1), and one Fe(3) atom to form distorted edge-sharing ORb4Fe2 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2Ce2Fe4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.844
_cell_length_b   8.844
_cell_length_c   3.985
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   126.307
_symmetry_Int_Tables_number   1
_cell_volume   251.209
_cell_formula_units_Z   1
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
  Rb  Rb0  1  0.000  0.502  0.500  1.0
  Rb  Rb1  1  0.498  1.000  0.500  1.0
  Ce  Ce2  1  0.750  0.750  0.500  1.0
  Ce  Ce3  1  0.250  0.250  0.500  1.0
  Fe  Fe4  1  0.122  0.878  0.000  1.0
  Fe  Fe5  1  0.891  0.109  0.000  1.0
  Fe  Fe6  1  0.375  0.625  0.000  1.0
  Fe  Fe7  1  0.608  0.392  0.000  1.0
  O  O8  1  0.836  0.660  0.000  1.0
  O  O9  1  0.340  0.164  0.000  1.0
  O  O10  1  0.160  0.341  0.000  1.0
  O  O11  1  0.659  0.840  0.000  1.0
  O  O12  1  0.083  0.917  0.500  1.0
  O  O13  1  0.903  0.097  0.500  1.0
  O  O14  1  0.416  0.584  0.500  1.0
  O  O15  1  0.599  0.401  0.500  1.0
  O  O16  1  0.255  0.745  0.000  1.0
[/CIF]
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The material structure described by Rb2Ce2Fe4O9 crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded in a 10-coordinate geometry to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(7) atoms. Ce(1) is bonded in a body-centered cubic geometry to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(7), two equivalent O(1), and two equivalent O(3) atoms to form distorted corner-sharing FeO5 trigonal bipyramids. In the second Fe site, Fe(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(4) atoms. In the third Fe site, Fe(3) is bonded to one O(7), two equivalent O(2), and two equivalent O(5) atoms to form distorted corner-sharing FeO5 trigonal bipyramids. In the fourth Fe site, Fe(4) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), one Fe(1), and one Fe(4) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), one Fe(2), and one Fe(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), and two equivalent Fe(1) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), and two equivalent Fe(2) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), and two equivalent Fe(3) atoms. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Ce(1), and two equivalent Fe(4) atoms. In the seventh O site, O(7) is bonded to four equivalent Rb(1), one Fe(1), and one Fe(3) atom to form distorted edge-sharing ORb4Fe2 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2Ce2Fe4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.844
_cell_length_b   8.844
_cell_length_c   3.985
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   126.307
_symmetry_Int_Tables_number   1
_cell_volume   251.209
_cell_formula_units_Z   1
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
  Rb  Rb0  1  0.000  0.502  0.500  1.0
  Rb  Rb1  1  0.498  1.000  0.500  1.0
  Ce  Ce2  1  0.750  0.750  0.500  1.0
  Ce  Ce3  1  0.250  0.250  0.500  1.0
  Fe  Fe4  1  0.122  0.878  0.000  1.0
  Fe  Fe5  1  0.891  0.109  0.000  1.0
  Fe  Fe6  1  0.375  0.625  0.000  1.0
  Fe  Fe7  1  0.608  0.392  0.000  1.0
  O  O8  1  0.836  0.660  0.000  1.0
  O  O9  1  0.340  0.164  0.000  1.0
  O  O10  1  0.160  0.341  0.000  1.0
  O  O11  1  0.659  0.840  0.000  1.0
  O  O12  1  0.083  0.917  0.500  1.0
  O  O13  1  0.903  0.097  0.500  1.0
  O  O14  1  0.416  0.584  0.500  1.0
  O  O15  1  0.599  0.401  0.500  1.0
  O  O16  1  0.255  0.745  0.000  1.0
[/CIF]
.