The material described by Rb2Ni3Se2 crystallizes in the orthorhombic Fddd space group. Rb(1) is bonded in a 7-coordinate geometry to one Rb(1), one Ni(2), two equivalent Ni(1), and three equivalent Se(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Ni(2), and two equivalent Se(1) atoms. In the second Ni site, Ni(2) is bonded in a distorted linear geometry to two equivalent Rb(1), four equivalent Ni(1), and two equivalent Se(1) atoms. Se(1) is bonded in a 6-coordinate geometry to three equivalent Rb(1), one Ni(2), and two equivalent Ni(1) atoms. is represented by the CIF card [CIF]
data_Rb2Ni3Se2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.865
_cell_length_b   7.819
_cell_length_c   16.847
_cell_angle_alpha   77.053
_cell_angle_beta   71.188
_cell_angle_gamma   45.988
_symmetry_Int_Tables_number   1
_cell_volume   974.317
_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  0.600  0.131  0.114  1.0
  Rb  Rb1  1  0.286  0.869  0.114  1.0
  Rb  Rb2  1  0.268  0.131  0.886  1.0
  Rb  Rb3  1  0.150  0.369  0.386  1.0
  Rb  Rb4  1  0.845  0.869  0.886  1.0
  Rb  Rb5  1  0.464  0.631  0.386  1.0
  Rb  Rb6  1  0.482  0.369  0.614  1.0
  Rb  Rb7  1  0.905  0.631  0.614  1.0
  Ni  Ni8  1  0.614  0.328  0.760  1.0
  Ni  Ni9  1  0.626  0.672  0.760  1.0
  Ni  Ni10  1  0.058  0.328  0.240  1.0
  Ni  Ni11  1  0.136  0.172  0.740  1.0
  Ni  Ni12  1  0.702  0.672  0.240  1.0
  Ni  Ni13  1  0.124  0.828  0.740  1.0
  Ni  Ni14  1  0.692  0.172  0.260  1.0
  Ni  Ni15  1  0.048  0.828  0.260  1.0
  Ni  Ni16  1  0.875  0.250  0.250  1.0
  Ni  Ni17  1  0.875  0.750  0.250  1.0
  Ni  Ni18  1  0.875  0.250  0.750  1.0
  Ni  Ni19  1  0.375  0.750  0.750  1.0
  Se  Se20  1  0.659  0.482  0.180  1.0
  Se  Se21  1  0.161  0.518  0.180  1.0
  Se  Se22  1  0.859  0.482  0.820  1.0
  Se  Se23  1  0.091  0.018  0.320  1.0
  Se  Se24  1  0.320  0.518  0.820  1.0
  Se  Se25  1  0.589  0.982  0.320  1.0
  Se  Se26  1  0.891  0.018  0.680  1.0
  Se  Se27  1  0.430  0.982  0.680  1.0
[/CIF]
.
The material described by Rb2Ni3Se2 crystallizes in the orthorhombic Fddd space group. Rb(1) is bonded in a 7-coordinate geometry to one Rb(1), one Ni(2), two equivalent Ni(1), and three equivalent Se(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Ni(2), and two equivalent Se(1) atoms. In the second Ni site, Ni(2) is bonded in a distorted linear geometry to two equivalent Rb(1), four equivalent Ni(1), and two equivalent Se(1) atoms. Se(1) is bonded in a 6-coordinate geometry to three equivalent Rb(1), one Ni(2), and two equivalent Ni(1) atoms. is represented by the CIF card [CIF]
data_Rb2Ni3Se2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.865
_cell_length_b   7.819
_cell_length_c   16.847
_cell_angle_alpha   77.053
_cell_angle_beta   71.188
_cell_angle_gamma   45.988
_symmetry_Int_Tables_number   1
_cell_volume   974.317
_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  0.600  0.131  0.114  1.0
  Rb  Rb1  1  0.286  0.869  0.114  1.0
  Rb  Rb2  1  0.268  0.131  0.886  1.0
  Rb  Rb3  1  0.150  0.369  0.386  1.0
  Rb  Rb4  1  0.845  0.869  0.886  1.0
  Rb  Rb5  1  0.464  0.631  0.386  1.0
  Rb  Rb6  1  0.482  0.369  0.614  1.0
  Rb  Rb7  1  0.905  0.631  0.614  1.0
  Ni  Ni8  1  0.614  0.328  0.760  1.0
  Ni  Ni9  1  0.626  0.672  0.760  1.0
  Ni  Ni10  1  0.058  0.328  0.240  1.0
  Ni  Ni11  1  0.136  0.172  0.740  1.0
  Ni  Ni12  1  0.702  0.672  0.240  1.0
  Ni  Ni13  1  0.124  0.828  0.740  1.0
  Ni  Ni14  1  0.692  0.172  0.260  1.0
  Ni  Ni15  1  0.048  0.828  0.260  1.0
  Ni  Ni16  1  0.875  0.250  0.250  1.0
  Ni  Ni17  1  0.875  0.750  0.250  1.0
  Ni  Ni18  1  0.875  0.250  0.750  1.0
  Ni  Ni19  1  0.375  0.750  0.750  1.0
  Se  Se20  1  0.659  0.482  0.180  1.0
  Se  Se21  1  0.161  0.518  0.180  1.0
  Se  Se22  1  0.859  0.482  0.820  1.0
  Se  Se23  1  0.091  0.018  0.320  1.0
  Se  Se24  1  0.320  0.518  0.820  1.0
  Se  Se25  1  0.589  0.982  0.320  1.0
  Se  Se26  1  0.891  0.018  0.680  1.0
  Se  Se27  1  0.430  0.982  0.680  1.0
[/CIF]
.