The structure described by Hg3Cd crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 8-coordinate geometry to four equivalent Hg(1) and four equivalent Cd(1) atoms. In the second Hg site, Hg(2) is bonded in a square co-planar geometry to four equivalent Cd(1) atoms. Cd(1) is bonded in a distorted square co-planar geometry to four equivalent Hg(2) and eight equivalent Hg(1) atoms. is represented by the CIF file [CIF]
data_CdHg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.176
_cell_length_b   6.176
_cell_length_c   6.176
_cell_angle_alpha   139.071
_cell_angle_beta   139.071
_cell_angle_gamma   59.267
_symmetry_Int_Tables_number   1
_cell_volume   100.119
_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
  Cd  Cd0  1  0.000  0.000  0.000  1.0
  Hg  Hg1  1  0.750  0.250  0.500  1.0
  Hg  Hg2  1  0.250  0.750  0.500  1.0
  Hg  Hg3  1  0.500  0.500  0.000  1.0
[/CIF]
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The structure described by Hg3Cd crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 8-coordinate geometry to four equivalent Hg(1) and four equivalent Cd(1) atoms. In the second Hg site, Hg(2) is bonded in a square co-planar geometry to four equivalent Cd(1) atoms. Cd(1) is bonded in a distorted square co-planar geometry to four equivalent Hg(2) and eight equivalent Hg(1) atoms. is represented by the CIF file [CIF]
data_CdHg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.176
_cell_length_b   6.176
_cell_length_c   6.176
_cell_angle_alpha   139.071
_cell_angle_beta   139.071
_cell_angle_gamma   59.267
_symmetry_Int_Tables_number   1
_cell_volume   100.119
_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
  Cd  Cd0  1  0.000  0.000  0.000  1.0
  Hg  Hg1  1  0.750  0.250  0.500  1.0
  Hg  Hg2  1  0.250  0.750  0.500  1.0
  Hg  Hg3  1  0.500  0.500  0.000  1.0
[/CIF]
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