data_Mg2CdCu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.76
_cell_length_b   4.76
_cell_length_c   4.76
_cell_angle_alpha   121.92
_cell_angle_beta   121.92
_cell_angle_gamma   86.7
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mg2CdCu
_chemical_formula_sum   'Mg2 Cd1 Cu1'
_cell_volume   73.7
_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  Mg2  1  0.31  0.0  0.73  1.0
  Mg  Mg3  1  0.0  0.31  0.73  1.0
  Cd  Cd0  1  0.0  0.0  0.46  1.0
  Cu  Cu1  1  0.0  0.0  0.0  1.0

data_Mg2CdCu
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.53
_cell_length_b   6.53
_cell_length_c   4.76
_cell_angle_alpha   90.0
_cell_angle_beta   133.35
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Mg2CdCu
_chemical_formula_sum   'Mg4 Cd2 Cu2'
_cell_volume   147.39
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  4  0.35  0.35  0.42  1.0
  Cd  Cd1  2  0.0  0.0  0.46  1.0
  Cu  Cu2  2  0.0  0.0  0.0  1.0

Mg Mg Cd Cu
Mg2CuCd crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a distorted single-bond geometry to two equivalent Cu(1) and one Cd(1) atom. There is one shorter (2.41 Å) and one longer (2.83 Å) Mg(1)-Cu(1) bond length. The Mg(1)-Cd(1) bond length is 1.35 Å. Cu(1) is bonded in a 5-coordinate geometry to four equivalent Mg(1) and one Cd(1) atom. The Cu(1)-Cd(1) bond length is 2.18 Å. Cd(1) is bonded in a 2-coordinate geometry to two equivalent Mg(1) and one Cu(1) atom.