The structure described by RbCeF4 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 7-coordinate geometry to one F(3), two equivalent F(1), and four equivalent F(4) atoms. Ce(1) is bonded in a 9-coordinate geometry to one F(4), two equivalent F(1), three equivalent F(2), and three equivalent F(3) atoms. There are four inequivalent F sites. In the first F site, F(1) is bonded to two equivalent Rb(1) and two equivalent Ce(1) atoms to form distorted FRb2Ce2 tetrahedra that share corners with four equivalent F(1)Rb2Ce2 tetrahedra, corners with six equivalent F(3)RbCe3 tetrahedra, and  an edgeedge with one F(3)RbCe3 tetrahedra. In the second F site, F(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ce(1) atoms. In the third F site, F(3) is bonded to one Rb(1) and three equivalent Ce(1) atoms to form FRbCe3 tetrahedra that share corners with two equivalent F(3)RbCe3 tetrahedra, corners with six equivalent F(1)Rb2Ce2 tetrahedra,  an edgeedge with one F(1)Rb2Ce2 tetrahedra, and edges with two equivalent F(3)RbCe3 tetrahedra. In the fourth F site, F(4) is bonded in a 5-coordinate geometry to four equivalent Rb(1) and one Ce(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbCeF4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.784
_cell_length_b   6.439
_cell_length_c   16.104
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   392.395
_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
  Rb  Rb0  1  0.250  0.725  0.701  1.0
  Rb  Rb1  1  0.750  0.275  0.299  1.0
  Rb  Rb2  1  0.750  0.775  0.201  1.0
  Rb  Rb3  1  0.250  0.225  0.799  1.0
  Ce  Ce4  1  0.250  0.252  0.058  1.0
  Ce  Ce5  1  0.750  0.748  0.942  1.0
  Ce  Ce6  1  0.750  0.248  0.558  1.0
  Ce  Ce7  1  0.250  0.752  0.442  1.0
  F  F8  1  0.250  0.608  0.869  1.0
  F  F9  1  0.750  0.392  0.131  1.0
  F  F10  1  0.750  0.892  0.369  1.0
  F  F11  1  0.250  0.108  0.631  1.0
  F  F12  1  0.250  0.633  0.038  1.0
  F  F13  1  0.750  0.367  0.962  1.0
  F  F14  1  0.750  0.867  0.538  1.0
  F  F15  1  0.250  0.133  0.462  1.0
  F  F16  1  0.250  0.502  0.556  1.0
  F  F17  1  0.750  0.498  0.444  1.0
  F  F18  1  0.750  0.998  0.056  1.0
  F  F19  1  0.250  0.002  0.944  1.0
  F  F20  1  0.250  0.597  0.313  1.0
  F  F21  1  0.750  0.403  0.687  1.0
  F  F22  1  0.750  0.903  0.813  1.0
  F  F23  1  0.250  0.097  0.187  1.0
[/CIF]
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The structure described by RbCeF4 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 7-coordinate geometry to one F(3), two equivalent F(1), and four equivalent F(4) atoms. Ce(1) is bonded in a 9-coordinate geometry to one F(4), two equivalent F(1), three equivalent F(2), and three equivalent F(3) atoms. There are four inequivalent F sites. In the first F site, F(1) is bonded to two equivalent Rb(1) and two equivalent Ce(1) atoms to form distorted FRb2Ce2 tetrahedra that share corners with four equivalent F(1)Rb2Ce2 tetrahedra, corners with six equivalent F(3)RbCe3 tetrahedra, and  an edgeedge with one F(3)RbCe3 tetrahedra. In the second F site, F(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ce(1) atoms. In the third F site, F(3) is bonded to one Rb(1) and three equivalent Ce(1) atoms to form FRbCe3 tetrahedra that share corners with two equivalent F(3)RbCe3 tetrahedra, corners with six equivalent F(1)Rb2Ce2 tetrahedra,  an edgeedge with one F(1)Rb2Ce2 tetrahedra, and edges with two equivalent F(3)RbCe3 tetrahedra. In the fourth F site, F(4) is bonded in a 5-coordinate geometry to four equivalent Rb(1) and one Ce(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbCeF4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.784
_cell_length_b   6.439
_cell_length_c   16.104
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   392.395
_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
  Rb  Rb0  1  0.250  0.725  0.701  1.0
  Rb  Rb1  1  0.750  0.275  0.299  1.0
  Rb  Rb2  1  0.750  0.775  0.201  1.0
  Rb  Rb3  1  0.250  0.225  0.799  1.0
  Ce  Ce4  1  0.250  0.252  0.058  1.0
  Ce  Ce5  1  0.750  0.748  0.942  1.0
  Ce  Ce6  1  0.750  0.248  0.558  1.0
  Ce  Ce7  1  0.250  0.752  0.442  1.0
  F  F8  1  0.250  0.608  0.869  1.0
  F  F9  1  0.750  0.392  0.131  1.0
  F  F10  1  0.750  0.892  0.369  1.0
  F  F11  1  0.250  0.108  0.631  1.0
  F  F12  1  0.250  0.633  0.038  1.0
  F  F13  1  0.750  0.367  0.962  1.0
  F  F14  1  0.750  0.867  0.538  1.0
  F  F15  1  0.250  0.133  0.462  1.0
  F  F16  1  0.250  0.502  0.556  1.0
  F  F17  1  0.750  0.498  0.444  1.0
  F  F18  1  0.750  0.998  0.056  1.0
  F  F19  1  0.250  0.002  0.944  1.0
  F  F20  1  0.250  0.597  0.313  1.0
  F  F21  1  0.750  0.403  0.687  1.0
  F  F22  1  0.750  0.903  0.813  1.0
  F  F23  1  0.250  0.097  0.187  1.0
[/CIF]
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