The material structure described by Na8Hg3 crystallizes in the trigonal R-3c space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one Hg(1), one Hg(2), and two equivalent Hg(3) atoms to form a mixture of distorted edge and corner-sharing NaHg4 tetrahedra. In the second Na site, Na(2) is bonded in a distorted trigonal non-coplanar geometry to one Hg(3) and two equivalent Hg(1) atoms. In the third Na site, Na(3) is bonded to one Hg(2) and three equivalent Hg(1) atoms to form a mixture of distorted edge and corner-sharing NaHg4 tetrahedra. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one Hg(3) and three equivalent Hg(1) atoms. There are three inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted q6 geometry to two equivalent Na(1), two equivalent Na(3), two equivalent Na(4), and four equivalent Na(2) atoms. In the second Hg site, Hg(2) is bonded in a body-centered cubic geometry to two equivalent Na(3) and six equivalent Na(1) atoms. In the third Hg site, Hg(3) is bonded in a distorted q6 geometry to one Na(4), three equivalent Na(2), and six equivalent Na(1) atoms. is represented by the CIF file [CIF]
data_Na8Hg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.037
_cell_length_b   18.037
_cell_length_c   18.037
_cell_angle_alpha   29.408
_cell_angle_beta   29.408
_cell_angle_gamma   29.408
_symmetry_Int_Tables_number   1
_cell_volume   1252.230
_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
  Na  Na0  1  0.209  0.859  0.486  1.0
  Na  Na1  1  0.859  0.486  0.209  1.0
  Na  Na2  1  0.486  0.209  0.859  1.0
  Na  Na3  1  0.641  0.291  0.014  1.0
  Na  Na4  1  0.291  0.014  0.641  1.0
  Na  Na5  1  0.014  0.641  0.291  1.0
  Na  Na6  1  0.791  0.141  0.514  1.0
  Na  Na7  1  0.141  0.514  0.791  1.0
  Na  Na8  1  0.514  0.791  0.141  1.0
  Na  Na9  1  0.359  0.709  0.986  1.0
  Na  Na10  1  0.709  0.986  0.359  1.0
  Na  Na11  1  0.986  0.359  0.709  1.0
  Na  Na12  1  0.636  0.880  0.141  1.0
  Na  Na13  1  0.880  0.141  0.636  1.0
  Na  Na14  1  0.141  0.636  0.880  1.0
  Na  Na15  1  0.620  0.864  0.359  1.0
  Na  Na16  1  0.864  0.359  0.620  1.0
  Na  Na17  1  0.359  0.620  0.864  1.0
  Na  Na18  1  0.364  0.120  0.859  1.0
  Na  Na19  1  0.120  0.859  0.364  1.0
  Na  Na20  1  0.859  0.364  0.120  1.0
  Na  Na21  1  0.380  0.136  0.641  1.0
  Na  Na22  1  0.136  0.641  0.380  1.0
  Na  Na23  1  0.641  0.380  0.136  1.0
  Na  Na24  1  0.562  0.562  0.562  1.0
  Na  Na25  1  0.938  0.938  0.938  1.0
  Na  Na26  1  0.438  0.438  0.438  1.0
  Na  Na27  1  0.062  0.062  0.062  1.0
  Na  Na28  1  0.220  0.220  0.220  1.0
  Na  Na29  1  0.280  0.280  0.280  1.0
  Na  Na30  1  0.780  0.780  0.780  1.0
  Na  Na31  1  0.720  0.720  0.720  1.0
  Hg  Hg32  1  0.066  0.434  0.750  1.0
  Hg  Hg33  1  0.434  0.750  0.066  1.0
  Hg  Hg34  1  0.750  0.066  0.434  1.0
  Hg  Hg35  1  0.934  0.566  0.250  1.0
  Hg  Hg36  1  0.566  0.250  0.934  1.0
  Hg  Hg37  1  0.250  0.934  0.566  1.0
  Hg  Hg38  1  0.500  0.500  0.500  1.0
  Hg  Hg39  1  0.000  0.000  0.000  1.0
  Hg  Hg40  1  0.842  0.842  0.842  1.0
  Hg  Hg41  1  0.658  0.658  0.658  1.0
  Hg  Hg42  1  0.158  0.158  0.158  1.0
  Hg  Hg43  1  0.342  0.342  0.342  1.0
[/CIF]
.
The material structure described by Na8Hg3 crystallizes in the trigonal R-3c space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one Hg(1), one Hg(2), and two equivalent Hg(3) atoms to form a mixture of distorted edge and corner-sharing NaHg4 tetrahedra. In the second Na site, Na(2) is bonded in a distorted trigonal non-coplanar geometry to one Hg(3) and two equivalent Hg(1) atoms. In the third Na site, Na(3) is bonded to one Hg(2) and three equivalent Hg(1) atoms to form a mixture of distorted edge and corner-sharing NaHg4 tetrahedra. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one Hg(3) and three equivalent Hg(1) atoms. There are three inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted q6 geometry to two equivalent Na(1), two equivalent Na(3), two equivalent Na(4), and four equivalent Na(2) atoms. In the second Hg site, Hg(2) is bonded in a body-centered cubic geometry to two equivalent Na(3) and six equivalent Na(1) atoms. In the third Hg site, Hg(3) is bonded in a distorted q6 geometry to one Na(4), three equivalent Na(2), and six equivalent Na(1) atoms. is represented by the CIF file [CIF]
data_Na8Hg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.037
_cell_length_b   18.037
_cell_length_c   18.037
_cell_angle_alpha   29.408
_cell_angle_beta   29.408
_cell_angle_gamma   29.408
_symmetry_Int_Tables_number   1
_cell_volume   1252.230
_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
  Na  Na0  1  0.209  0.859  0.486  1.0
  Na  Na1  1  0.859  0.486  0.209  1.0
  Na  Na2  1  0.486  0.209  0.859  1.0
  Na  Na3  1  0.641  0.291  0.014  1.0
  Na  Na4  1  0.291  0.014  0.641  1.0
  Na  Na5  1  0.014  0.641  0.291  1.0
  Na  Na6  1  0.791  0.141  0.514  1.0
  Na  Na7  1  0.141  0.514  0.791  1.0
  Na  Na8  1  0.514  0.791  0.141  1.0
  Na  Na9  1  0.359  0.709  0.986  1.0
  Na  Na10  1  0.709  0.986  0.359  1.0
  Na  Na11  1  0.986  0.359  0.709  1.0
  Na  Na12  1  0.636  0.880  0.141  1.0
  Na  Na13  1  0.880  0.141  0.636  1.0
  Na  Na14  1  0.141  0.636  0.880  1.0
  Na  Na15  1  0.620  0.864  0.359  1.0
  Na  Na16  1  0.864  0.359  0.620  1.0
  Na  Na17  1  0.359  0.620  0.864  1.0
  Na  Na18  1  0.364  0.120  0.859  1.0
  Na  Na19  1  0.120  0.859  0.364  1.0
  Na  Na20  1  0.859  0.364  0.120  1.0
  Na  Na21  1  0.380  0.136  0.641  1.0
  Na  Na22  1  0.136  0.641  0.380  1.0
  Na  Na23  1  0.641  0.380  0.136  1.0
  Na  Na24  1  0.562  0.562  0.562  1.0
  Na  Na25  1  0.938  0.938  0.938  1.0
  Na  Na26  1  0.438  0.438  0.438  1.0
  Na  Na27  1  0.062  0.062  0.062  1.0
  Na  Na28  1  0.220  0.220  0.220  1.0
  Na  Na29  1  0.280  0.280  0.280  1.0
  Na  Na30  1  0.780  0.780  0.780  1.0
  Na  Na31  1  0.720  0.720  0.720  1.0
  Hg  Hg32  1  0.066  0.434  0.750  1.0
  Hg  Hg33  1  0.434  0.750  0.066  1.0
  Hg  Hg34  1  0.750  0.066  0.434  1.0
  Hg  Hg35  1  0.934  0.566  0.250  1.0
  Hg  Hg36  1  0.566  0.250  0.934  1.0
  Hg  Hg37  1  0.250  0.934  0.566  1.0
  Hg  Hg38  1  0.500  0.500  0.500  1.0
  Hg  Hg39  1  0.000  0.000  0.000  1.0
  Hg  Hg40  1  0.842  0.842  0.842  1.0
  Hg  Hg41  1  0.658  0.658  0.658  1.0
  Hg  Hg42  1  0.158  0.158  0.158  1.0
  Hg  Hg43  1  0.342  0.342  0.342  1.0
[/CIF]
.