The compound described by Mg2Sb crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Sb(1) atoms. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Mg(1), six equivalent Mg(2), and four equivalent Sb(1) atoms. Sb(1) is bonded in a 10-coordinate geometry to four equivalent Mg(2) and six equivalent Mg(1) atoms. is represented by the CIF file [CIF]
data_Mg2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.088
_cell_length_b   8.088
_cell_length_c   5.472
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   156.386
_symmetry_Int_Tables_number   1
_cell_volume   143.363
_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
  Mg  Mg0  1  0.558  0.442  0.250  1.0
  Mg  Mg1  1  0.222  0.778  0.250  1.0
  Mg  Mg2  1  0.778  0.222  0.750  1.0
  Mg  Mg3  1  0.442  0.558  0.750  1.0
  Sb  Sb4  1  0.889  0.111  0.250  1.0
  Sb  Sb5  1  0.111  0.889  0.750  1.0
[/CIF]
.
The compound described by Mg2Sb crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Sb(1) atoms. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Mg(1), six equivalent Mg(2), and four equivalent Sb(1) atoms. Sb(1) is bonded in a 10-coordinate geometry to four equivalent Mg(2) and six equivalent Mg(1) atoms. is represented by the CIF file [CIF]
data_Mg2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.088
_cell_length_b   8.088
_cell_length_c   5.472
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   156.386
_symmetry_Int_Tables_number   1
_cell_volume   143.363
_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
  Mg  Mg0  1  0.558  0.442  0.250  1.0
  Mg  Mg1  1  0.222  0.778  0.250  1.0
  Mg  Mg2  1  0.778  0.222  0.750  1.0
  Mg  Mg3  1  0.442  0.558  0.750  1.0
  Sb  Sb4  1  0.889  0.111  0.250  1.0
  Sb  Sb5  1  0.111  0.889  0.750  1.0
[/CIF]
.