The compound described by Mg3Ir is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a trigonal planar geometry to three equivalent Ir(1) atoms. In the second Mg site, Mg(2) is bonded in a 1-coordinate geometry to four equivalent Ir(1) atoms. Ir(1) is bonded in a 11-coordinate geometry to three equivalent Mg(1) and eight equivalent Mg(2) atoms. is represented by the CIF file [CIF]
data_Mg3Ir
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.543
_cell_length_b   4.543
_cell_length_c   8.182
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   146.235
_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  0.000  0.000  0.250  1.0
  Mg  Mg1  1  0.000  0.000  0.750  1.0
  Mg  Mg2  1  0.333  0.667  0.578  1.0
  Mg  Mg3  1  0.667  0.333  0.078  1.0
  Mg  Mg4  1  0.667  0.333  0.422  1.0
  Mg  Mg5  1  0.333  0.667  0.922  1.0
  Ir  Ir6  1  0.333  0.667  0.250  1.0
  Ir  Ir7  1  0.667  0.333  0.750  1.0
[/CIF]
.
The compound described by Mg3Ir is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a trigonal planar geometry to three equivalent Ir(1) atoms. In the second Mg site, Mg(2) is bonded in a 1-coordinate geometry to four equivalent Ir(1) atoms. Ir(1) is bonded in a 11-coordinate geometry to three equivalent Mg(1) and eight equivalent Mg(2) atoms. is represented by the CIF file [CIF]
data_Mg3Ir
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.543
_cell_length_b   4.543
_cell_length_c   8.182
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   146.235
_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  0.000  0.000  0.250  1.0
  Mg  Mg1  1  0.000  0.000  0.750  1.0
  Mg  Mg2  1  0.333  0.667  0.578  1.0
  Mg  Mg3  1  0.667  0.333  0.078  1.0
  Mg  Mg4  1  0.667  0.333  0.422  1.0
  Mg  Mg5  1  0.333  0.667  0.922  1.0
  Ir  Ir6  1  0.333  0.667  0.250  1.0
  Ir  Ir7  1  0.667  0.333  0.750  1.0
[/CIF]
.