The crystal structure described by Mg3Os is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to eight equivalent Mg(2) and four equivalent Os(1) atoms to form MgMg8Os4 cuboctahedra that share corners with four equivalent Mg(1)Mg8Os4 cuboctahedra, corners with eight equivalent Os(1)Mg12 cuboctahedra, edges with eight equivalent Mg(1)Mg8Os4 cuboctahedra, faces with four equivalent Mg(1)Mg8Os4 cuboctahedra, and faces with six equivalent Os(1)Mg12 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to four equivalent Mg(1) and four equivalent Os(1) atoms. Os(1) is bonded to four equivalent Mg(1) and eight equivalent Mg(2) atoms to form OsMg12 cuboctahedra that share corners with four equivalent Os(1)Mg12 cuboctahedra, corners with eight equivalent Mg(1)Mg8Os4 cuboctahedra, edges with eight equivalent Os(1)Mg12 cuboctahedra, faces with four equivalent Os(1)Mg12 cuboctahedra, and faces with six equivalent Mg(1)Mg8Os4 cuboctahedra. is represented by the CIF card [CIF]
data_Mg3Os
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.882
_cell_length_b   4.882
_cell_length_c   4.882
_cell_angle_alpha   128.586
_cell_angle_beta   128.586
_cell_angle_gamma   75.678
_symmetry_Int_Tables_number   1
_cell_volume   69.153
_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
  Mg  Mg0  1  0.500  0.500  0.000  1.0
  Mg  Mg1  1  0.750  0.250  0.500  1.0
  Mg  Mg2  1  0.250  0.750  0.500  1.0
  Os  Os3  1  0.000  0.000  0.000  1.0
[/CIF]
.
The crystal structure described by Mg3Os is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to eight equivalent Mg(2) and four equivalent Os(1) atoms to form MgMg8Os4 cuboctahedra that share corners with four equivalent Mg(1)Mg8Os4 cuboctahedra, corners with eight equivalent Os(1)Mg12 cuboctahedra, edges with eight equivalent Mg(1)Mg8Os4 cuboctahedra, faces with four equivalent Mg(1)Mg8Os4 cuboctahedra, and faces with six equivalent Os(1)Mg12 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to four equivalent Mg(1) and four equivalent Os(1) atoms. Os(1) is bonded to four equivalent Mg(1) and eight equivalent Mg(2) atoms to form OsMg12 cuboctahedra that share corners with four equivalent Os(1)Mg12 cuboctahedra, corners with eight equivalent Mg(1)Mg8Os4 cuboctahedra, edges with eight equivalent Os(1)Mg12 cuboctahedra, faces with four equivalent Os(1)Mg12 cuboctahedra, and faces with six equivalent Mg(1)Mg8Os4 cuboctahedra. is represented by the CIF card [CIF]
data_Mg3Os
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.882
_cell_length_b   4.882
_cell_length_c   4.882
_cell_angle_alpha   128.586
_cell_angle_beta   128.586
_cell_angle_gamma   75.678
_symmetry_Int_Tables_number   1
_cell_volume   69.153
_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
  Mg  Mg0  1  0.500  0.500  0.000  1.0
  Mg  Mg1  1  0.750  0.250  0.500  1.0
  Mg  Mg2  1  0.250  0.750  0.500  1.0
  Os  Os3  1  0.000  0.000  0.000  1.0
[/CIF]
.