data_MgCd3Cu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.99
_cell_length_b   4.99
_cell_length_c   4.99
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgCd3Cu
_chemical_formula_sum   'Mg1 Cd3 Cu1'
_cell_volume   123.99
_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  0.0  0.0  0.0  1.0
  Cd  Cd2  1  0.49  0.0  0.49  1.0
  Cd  Cd3  1  0.49  0.49  0.0  1.0
  Cd  Cd4  1  0.0  0.49  0.49  1.0
  Cu  Cu1  1  0.49  0.49  0.49  1.0

data_MgCd3Cu
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.05
_cell_length_b   7.05
_cell_length_c   8.64
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   MgCd3Cu
_chemical_formula_sum   'Mg3 Cd9 Cu3'
_cell_volume   371.98
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.0  1.0
  Cd  Cd1  9  0.0  0.5  1.0  1.0
  Cu  Cu2  3  0.0  0.0  0.49  1.0

Mg Cd Cd Cd Cu
Mg Cd Cd Cd Cu 0 2 - - o 0 2 - o o 0 2 o - o 0 2 o o o 0 1 - o - 0 1 - o o 0 1 o o - 0 1 o o o 0 3 o - - 0 3 o - o 0 3 o o - 0 3 o o o 1 4 o - o 1 4 o o o 2 4 o o - 2 4 o o o 3 4 - o o 3 4 o o o 
MgCuCd3 is (Cubic) Perovskite structured and crystallizes in the trigonal R3m space group. Mg(1) is bonded to twelve equivalent Cd(1) atoms to form MgCd12 cuboctahedra that share corners with twelve equivalent Mg(1)Cd12 cuboctahedra, faces with six equivalent Mg(1)Cd12 cuboctahedra, and faces with eight equivalent Cu(1)Cd6 octahedra. There are a spread of Mg(1)-Cd(1) bond distances ranging from 3.48-3.57 Å. Cu(1) is bonded to six equivalent Cd(1) atoms to form CuCd6 octahedra that share corners with six equivalent Cu(1)Cd6 octahedra and faces with eight equivalent Mg(1)Cd12 cuboctahedra. The corner-sharing octahedra are not tilted. There are three shorter (2.46 Å) and three longer (2.53 Å) Cu(1)-Cd(1) bond lengths. Cd(1) is bonded in a distorted linear geometry to four equivalent Mg(1) and two equivalent Cu(1) atoms.