The structure described by Mg2Sb crystallizes in the orthorhombic Immm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to four equivalent Sb(1) atoms. In the second Mg site, Mg(2) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Sb(1) atoms. Sb(1) is bonded to four equivalent Mg(1) and four equivalent Mg(2) atoms to form a mixture of distorted corner, edge, and face-sharing SbMg8 hexagonal bipyramids. is represented by the CIF file [CIF]
data_Mg2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.168
_cell_length_b   7.168
_cell_length_c   7.168
_cell_angle_alpha   147.305
_cell_angle_beta   130.845
_cell_angle_gamma   60.293
_symmetry_Int_Tables_number   1
_cell_volume   149.147
_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  0.252  0.000  0.252  1.0
  Mg  Mg1  1  0.175  0.675  0.500  1.0
  Mg  Mg2  1  0.825  0.325  0.500  1.0
  Mg  Mg3  1  0.748  0.000  0.748  1.0
  Sb  Sb4  1  0.649  0.649  0.000  1.0
  Sb  Sb5  1  0.351  0.351  0.000  1.0
[/CIF]
.
The structure described by Mg2Sb crystallizes in the orthorhombic Immm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to four equivalent Sb(1) atoms. In the second Mg site, Mg(2) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Sb(1) atoms. Sb(1) is bonded to four equivalent Mg(1) and four equivalent Mg(2) atoms to form a mixture of distorted corner, edge, and face-sharing SbMg8 hexagonal bipyramids. is represented by the CIF file [CIF]
data_Mg2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.168
_cell_length_b   7.168
_cell_length_c   7.168
_cell_angle_alpha   147.305
_cell_angle_beta   130.845
_cell_angle_gamma   60.293
_symmetry_Int_Tables_number   1
_cell_volume   149.147
_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  0.252  0.000  0.252  1.0
  Mg  Mg1  1  0.175  0.675  0.500  1.0
  Mg  Mg2  1  0.825  0.325  0.500  1.0
  Mg  Mg3  1  0.748  0.000  0.748  1.0
  Sb  Sb4  1  0.649  0.649  0.000  1.0
  Sb  Sb5  1  0.351  0.351  0.000  1.0
[/CIF]
.