The material described by Rb4Hg3Sn20 crystallizes in the cubic Pm-3n space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 20-coordinate geometry to eight equivalent Sn(2) and twelve equivalent Sn(1) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to eight equivalent Sn(1) atoms. Hg(1) is bonded in a tetrahedral geometry to four equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(2) is bonded in a distorted pentagonal planar geometry to one Rb(1), one Sn(2), and three equivalent Sn(1) atoms. In the second Sn site, Sn(1) is bonded in a 7-coordinate geometry to one Rb(1), two equivalent Rb(2), one Hg(1), one Sn(1), and two equivalent Sn(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb4Sn20Hg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.466
_cell_length_b   12.466
_cell_length_c   12.466
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1937.078
_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
  Rb  Rb0  1  0.000  0.000  0.000  1.0
  Rb  Rb1  1  0.500  0.500  0.500  1.0
  Rb  Rb2  1  0.250  0.000  0.500  1.0
  Rb  Rb3  1  0.750  0.000  0.500  1.0
  Rb  Rb4  1  0.500  0.250  0.000  1.0
  Rb  Rb5  1  0.500  0.750  0.000  1.0
  Rb  Rb6  1  0.000  0.500  0.250  1.0
  Rb  Rb7  1  0.000  0.500  0.750  1.0
  Sn  Sn8  1  0.000  0.117  0.312  1.0
  Sn  Sn9  1  0.000  0.883  0.688  1.0
  Sn  Sn10  1  0.000  0.883  0.312  1.0
  Sn  Sn11  1  0.000  0.117  0.688  1.0
  Sn  Sn12  1  0.312  0.000  0.117  1.0
  Sn  Sn13  1  0.617  0.500  0.188  1.0
  Sn  Sn14  1  0.688  0.000  0.883  1.0
  Sn  Sn15  1  0.383  0.500  0.812  1.0
  Sn  Sn16  1  0.312  0.000  0.883  1.0
  Sn  Sn17  1  0.383  0.500  0.188  1.0
  Sn  Sn18  1  0.688  0.000  0.117  1.0
  Sn  Sn19  1  0.617  0.500  0.812  1.0
  Sn  Sn20  1  0.117  0.312  0.000  1.0
  Sn  Sn21  1  0.500  0.812  0.383  1.0
  Sn  Sn22  1  0.883  0.688  0.000  1.0
  Sn  Sn23  1  0.500  0.188  0.617  1.0
  Sn  Sn24  1  0.117  0.688  0.000  1.0
  Sn  Sn25  1  0.500  0.188  0.383  1.0
  Sn  Sn26  1  0.883  0.312  0.000  1.0
  Sn  Sn27  1  0.500  0.812  0.617  1.0
  Sn  Sn28  1  0.188  0.617  0.500  1.0
  Sn  Sn29  1  0.812  0.383  0.500  1.0
  Sn  Sn30  1  0.188  0.383  0.500  1.0
  Sn  Sn31  1  0.812  0.617  0.500  1.0
  Sn  Sn32  1  0.183  0.183  0.183  1.0
  Sn  Sn33  1  0.817  0.817  0.817  1.0
  Sn  Sn34  1  0.817  0.817  0.183  1.0
  Sn  Sn35  1  0.817  0.183  0.817  1.0
  Sn  Sn36  1  0.683  0.683  0.317  1.0
  Sn  Sn37  1  0.183  0.183  0.817  1.0
  Sn  Sn38  1  0.183  0.817  0.183  1.0
  Sn  Sn39  1  0.317  0.317  0.683  1.0
  Sn  Sn40  1  0.183  0.817  0.817  1.0
  Sn  Sn41  1  0.317  0.317  0.317  1.0
  Sn  Sn42  1  0.817  0.183  0.183  1.0
  Sn  Sn43  1  0.683  0.683  0.683  1.0
  Sn  Sn44  1  0.683  0.317  0.683  1.0
  Sn  Sn45  1  0.317  0.683  0.317  1.0
  Sn  Sn46  1  0.317  0.683  0.683  1.0
  Sn  Sn47  1  0.683  0.317  0.317  1.0
  Hg  Hg48  1  0.250  0.500  0.000  1.0
  Hg  Hg49  1  0.750  0.500  0.000  1.0
  Hg  Hg50  1  0.000  0.250  0.500  1.0
  Hg  Hg51  1  0.000  0.750  0.500  1.0
  Hg  Hg52  1  0.500  0.000  0.250  1.0
  Hg  Hg53  1  0.500  0.000  0.750  1.0
[/CIF]
.
The material described by Rb4Hg3Sn20 crystallizes in the cubic Pm-3n space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 20-coordinate geometry to eight equivalent Sn(2) and twelve equivalent Sn(1) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to eight equivalent Sn(1) atoms. Hg(1) is bonded in a tetrahedral geometry to four equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(2) is bonded in a distorted pentagonal planar geometry to one Rb(1), one Sn(2), and three equivalent Sn(1) atoms. In the second Sn site, Sn(1) is bonded in a 7-coordinate geometry to one Rb(1), two equivalent Rb(2), one Hg(1), one Sn(1), and two equivalent Sn(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb4Sn20Hg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.466
_cell_length_b   12.466
_cell_length_c   12.466
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1937.078
_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
  Rb  Rb0  1  0.000  0.000  0.000  1.0
  Rb  Rb1  1  0.500  0.500  0.500  1.0
  Rb  Rb2  1  0.250  0.000  0.500  1.0
  Rb  Rb3  1  0.750  0.000  0.500  1.0
  Rb  Rb4  1  0.500  0.250  0.000  1.0
  Rb  Rb5  1  0.500  0.750  0.000  1.0
  Rb  Rb6  1  0.000  0.500  0.250  1.0
  Rb  Rb7  1  0.000  0.500  0.750  1.0
  Sn  Sn8  1  0.000  0.117  0.312  1.0
  Sn  Sn9  1  0.000  0.883  0.688  1.0
  Sn  Sn10  1  0.000  0.883  0.312  1.0
  Sn  Sn11  1  0.000  0.117  0.688  1.0
  Sn  Sn12  1  0.312  0.000  0.117  1.0
  Sn  Sn13  1  0.617  0.500  0.188  1.0
  Sn  Sn14  1  0.688  0.000  0.883  1.0
  Sn  Sn15  1  0.383  0.500  0.812  1.0
  Sn  Sn16  1  0.312  0.000  0.883  1.0
  Sn  Sn17  1  0.383  0.500  0.188  1.0
  Sn  Sn18  1  0.688  0.000  0.117  1.0
  Sn  Sn19  1  0.617  0.500  0.812  1.0
  Sn  Sn20  1  0.117  0.312  0.000  1.0
  Sn  Sn21  1  0.500  0.812  0.383  1.0
  Sn  Sn22  1  0.883  0.688  0.000  1.0
  Sn  Sn23  1  0.500  0.188  0.617  1.0
  Sn  Sn24  1  0.117  0.688  0.000  1.0
  Sn  Sn25  1  0.500  0.188  0.383  1.0
  Sn  Sn26  1  0.883  0.312  0.000  1.0
  Sn  Sn27  1  0.500  0.812  0.617  1.0
  Sn  Sn28  1  0.188  0.617  0.500  1.0
  Sn  Sn29  1  0.812  0.383  0.500  1.0
  Sn  Sn30  1  0.188  0.383  0.500  1.0
  Sn  Sn31  1  0.812  0.617  0.500  1.0
  Sn  Sn32  1  0.183  0.183  0.183  1.0
  Sn  Sn33  1  0.817  0.817  0.817  1.0
  Sn  Sn34  1  0.817  0.817  0.183  1.0
  Sn  Sn35  1  0.817  0.183  0.817  1.0
  Sn  Sn36  1  0.683  0.683  0.317  1.0
  Sn  Sn37  1  0.183  0.183  0.817  1.0
  Sn  Sn38  1  0.183  0.817  0.183  1.0
  Sn  Sn39  1  0.317  0.317  0.683  1.0
  Sn  Sn40  1  0.183  0.817  0.817  1.0
  Sn  Sn41  1  0.317  0.317  0.317  1.0
  Sn  Sn42  1  0.817  0.183  0.183  1.0
  Sn  Sn43  1  0.683  0.683  0.683  1.0
  Sn  Sn44  1  0.683  0.317  0.683  1.0
  Sn  Sn45  1  0.317  0.683  0.317  1.0
  Sn  Sn46  1  0.317  0.683  0.683  1.0
  Sn  Sn47  1  0.683  0.317  0.317  1.0
  Hg  Hg48  1  0.250  0.500  0.000  1.0
  Hg  Hg49  1  0.750  0.500  0.000  1.0
  Hg  Hg50  1  0.000  0.250  0.500  1.0
  Hg  Hg51  1  0.000  0.750  0.500  1.0
  Hg  Hg52  1  0.500  0.000  0.250  1.0
  Hg  Hg53  1  0.500  0.000  0.750  1.0
[/CIF]
.