The crystal structure described by Mg2Cd crystallizes in the trigonal R32 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), six equivalent Mg(1), and four equivalent Cd(1) atoms to form distorted MgMg8Cd4 cuboctahedra that share corners with eighteen equivalent Mg(1)Mg8Cd4 cuboctahedra, edges with four equivalent Mg(2)Mg6Cd6 cuboctahedra, edges with six equivalent Mg(1)Mg8Cd4 cuboctahedra, edges with eight equivalent Cd(1)Mg9Cd3 cuboctahedra, faces with four equivalent Mg(2)Mg6Cd6 cuboctahedra, faces with eight equivalent Mg(1)Mg8Cd4 cuboctahedra, and faces with eight equivalent Cd(1)Mg9Cd3 cuboctahedra. In the second Mg site, Mg(2) is bonded to six equivalent Mg(1) and six equivalent Cd(1) atoms to form MgMg6Cd6 cuboctahedra that share corners with six equivalent Mg(2)Mg6Cd6 cuboctahedra, corners with twelve equivalent Cd(1)Mg9Cd3 cuboctahedra, edges with six equivalent Mg(2)Mg6Cd6 cuboctahedra, edges with twelve equivalent Mg(1)Mg8Cd4 cuboctahedra, faces with eight equivalent Cd(1)Mg9Cd3 cuboctahedra, and faces with twelve equivalent Mg(1)Mg8Cd4 cuboctahedra. Cd(1) is bonded to three equivalent Mg(2), six equivalent Mg(1), and three equivalent Cd(1) atoms to form distorted CdMg9Cd3 cuboctahedra that share corners with six equivalent Mg(2)Mg6Cd6 cuboctahedra, corners with twelve equivalent Cd(1)Mg9Cd3 cuboctahedra, edges with six equivalent Cd(1)Mg9Cd3 cuboctahedra, edges with twelve equivalent Mg(1)Mg8Cd4 cuboctahedra, faces with four equivalent Mg(2)Mg6Cd6 cuboctahedra, faces with four equivalent Cd(1)Mg9Cd3 cuboctahedra, and faces with twelve equivalent Mg(1)Mg8Cd4 cuboctahedra. is represented by the CIF card [CIF]
data_Mg2Cd
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.960
_cell_length_b   5.960
_cell_length_c   5.960
_cell_angle_alpha   53.989
_cell_angle_beta   53.989
_cell_angle_gamma   53.989
_symmetry_Int_Tables_number   1
_cell_volume   128.669
_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  0.668  0.332  1.0
  Mg  Mg1  1  0.668  0.332  0.000  1.0
  Mg  Mg2  1  0.500  0.500  0.500  1.0
  Mg  Mg3  1  0.332  0.000  0.668  1.0
  Cd  Cd4  1  0.834  0.834  0.834  1.0
  Cd  Cd5  1  0.166  0.166  0.166  1.0
[/CIF]
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The crystal structure described by Mg2Cd crystallizes in the trigonal R32 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), six equivalent Mg(1), and four equivalent Cd(1) atoms to form distorted MgMg8Cd4 cuboctahedra that share corners with eighteen equivalent Mg(1)Mg8Cd4 cuboctahedra, edges with four equivalent Mg(2)Mg6Cd6 cuboctahedra, edges with six equivalent Mg(1)Mg8Cd4 cuboctahedra, edges with eight equivalent Cd(1)Mg9Cd3 cuboctahedra, faces with four equivalent Mg(2)Mg6Cd6 cuboctahedra, faces with eight equivalent Mg(1)Mg8Cd4 cuboctahedra, and faces with eight equivalent Cd(1)Mg9Cd3 cuboctahedra. In the second Mg site, Mg(2) is bonded to six equivalent Mg(1) and six equivalent Cd(1) atoms to form MgMg6Cd6 cuboctahedra that share corners with six equivalent Mg(2)Mg6Cd6 cuboctahedra, corners with twelve equivalent Cd(1)Mg9Cd3 cuboctahedra, edges with six equivalent Mg(2)Mg6Cd6 cuboctahedra, edges with twelve equivalent Mg(1)Mg8Cd4 cuboctahedra, faces with eight equivalent Cd(1)Mg9Cd3 cuboctahedra, and faces with twelve equivalent Mg(1)Mg8Cd4 cuboctahedra. Cd(1) is bonded to three equivalent Mg(2), six equivalent Mg(1), and three equivalent Cd(1) atoms to form distorted CdMg9Cd3 cuboctahedra that share corners with six equivalent Mg(2)Mg6Cd6 cuboctahedra, corners with twelve equivalent Cd(1)Mg9Cd3 cuboctahedra, edges with six equivalent Cd(1)Mg9Cd3 cuboctahedra, edges with twelve equivalent Mg(1)Mg8Cd4 cuboctahedra, faces with four equivalent Mg(2)Mg6Cd6 cuboctahedra, faces with four equivalent Cd(1)Mg9Cd3 cuboctahedra, and faces with twelve equivalent Mg(1)Mg8Cd4 cuboctahedra. is represented by the CIF card [CIF]
data_Mg2Cd
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.960
_cell_length_b   5.960
_cell_length_c   5.960
_cell_angle_alpha   53.989
_cell_angle_beta   53.989
_cell_angle_gamma   53.989
_symmetry_Int_Tables_number   1
_cell_volume   128.669
_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  0.668  0.332  1.0
  Mg  Mg1  1  0.668  0.332  0.000  1.0
  Mg  Mg2  1  0.500  0.500  0.500  1.0
  Mg  Mg3  1  0.332  0.000  0.668  1.0
  Cd  Cd4  1  0.834  0.834  0.834  1.0
  Cd  Cd5  1  0.166  0.166  0.166  1.0
[/CIF]
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