The crystal structure described by CaCu9Cd2 crystallizes in the tetragonal P4/mbm space group. Ca(1) is bonded in a 20-coordinate geometry to eight equivalent Cu(1), eight equivalent Cu(3), and four equivalent Cd(1) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Ca(1), one Cu(2), three equivalent Cu(1), four equivalent Cu(3), and two equivalent Cd(1) atoms to form distorted CuCa2Cd2Cu8 cuboctahedra that share corners with three equivalent Cu(2)Cd4Cu8 cuboctahedra, corners with six equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, corners with eleven equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, edges with two equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, edges with four equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, faces with two equivalent Cu(2)Cd4Cu8 cuboctahedra, faces with seven equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, and faces with ten equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra. In the second Cu site, Cu(2) is bonded to four equivalent Cu(1), four equivalent Cu(3), and four equivalent Cd(1) atoms to form CuCd4Cu8 cuboctahedra that share corners with four equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, corners with twelve equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, edges with two equivalent Cu(2)Cd4Cu8 cuboctahedra, faces with eight equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, and faces with twelve equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra. In the third Cu site, Cu(3) is bonded to two equivalent Ca(1), one Cu(2), two equivalent Cu(3), four equivalent Cu(1), and three equivalent Cd(1) atoms to form CuCa2Cd3Cu7 cuboctahedra that share  a cornercorner with one Cu(2)Cd4Cu8 cuboctahedra, corners with six equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, corners with eleven equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, edges with four equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, edges with five equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, faces with three equivalent Cu(2)Cd4Cu8 cuboctahedra, faces with seven equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, and faces with ten equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra. Cd(1) is bonded in a 15-coordinate geometry to two equivalent Ca(1), two equivalent Cu(2), four equivalent Cu(1), six equivalent Cu(3), and one Cd(1) atom. is represented by the CIF file [CIF]
data_CaCd2Cu9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.104
_cell_length_b   8.346
_cell_length_c   8.346
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   355.527
_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
  Ca  Ca0  1  0.000  0.500  0.500  1.0
  Ca  Ca1  1  0.000  0.000  0.000  1.0
  Cd  Cd2  1  0.000  0.123  0.623  1.0
  Cd  Cd3  1  0.000  0.877  0.377  1.0
  Cd  Cd4  1  0.000  0.377  0.123  1.0
  Cd  Cd5  1  0.000  0.623  0.877  1.0
  Cu  Cu6  1  0.500  0.564  0.706  1.0
  Cu  Cu7  1  0.500  0.436  0.294  1.0
  Cu  Cu8  1  0.500  0.936  0.206  1.0
  Cu  Cu9  1  0.500  0.064  0.794  1.0
  Cu  Cu10  1  0.500  0.706  0.436  1.0
  Cu  Cu11  1  0.500  0.294  0.564  1.0
  Cu  Cu12  1  0.500  0.206  0.064  1.0
  Cu  Cu13  1  0.500  0.794  0.936  1.0
  Cu  Cu14  1  0.500  0.000  0.500  1.0
  Cu  Cu15  1  0.500  0.500  0.000  1.0
  Cu  Cu16  1  0.753  0.322  0.822  1.0
  Cu  Cu17  1  0.753  0.678  0.178  1.0
  Cu  Cu18  1  0.753  0.178  0.322  1.0
  Cu  Cu19  1  0.753  0.822  0.678  1.0
  Cu  Cu20  1  0.247  0.678  0.178  1.0
  Cu  Cu21  1  0.247  0.322  0.822  1.0
  Cu  Cu22  1  0.247  0.822  0.678  1.0
  Cu  Cu23  1  0.247  0.178  0.322  1.0
[/CIF]
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The crystal structure described by CaCu9Cd2 crystallizes in the tetragonal P4/mbm space group. Ca(1) is bonded in a 20-coordinate geometry to eight equivalent Cu(1), eight equivalent Cu(3), and four equivalent Cd(1) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Ca(1), one Cu(2), three equivalent Cu(1), four equivalent Cu(3), and two equivalent Cd(1) atoms to form distorted CuCa2Cd2Cu8 cuboctahedra that share corners with three equivalent Cu(2)Cd4Cu8 cuboctahedra, corners with six equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, corners with eleven equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, edges with two equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, edges with four equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, faces with two equivalent Cu(2)Cd4Cu8 cuboctahedra, faces with seven equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, and faces with ten equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra. In the second Cu site, Cu(2) is bonded to four equivalent Cu(1), four equivalent Cu(3), and four equivalent Cd(1) atoms to form CuCd4Cu8 cuboctahedra that share corners with four equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, corners with twelve equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, edges with two equivalent Cu(2)Cd4Cu8 cuboctahedra, faces with eight equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, and faces with twelve equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra. In the third Cu site, Cu(3) is bonded to two equivalent Ca(1), one Cu(2), two equivalent Cu(3), four equivalent Cu(1), and three equivalent Cd(1) atoms to form CuCa2Cd3Cu7 cuboctahedra that share  a cornercorner with one Cu(2)Cd4Cu8 cuboctahedra, corners with six equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, corners with eleven equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, edges with four equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra, edges with five equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, faces with three equivalent Cu(2)Cd4Cu8 cuboctahedra, faces with seven equivalent Cu(3)Ca2Cd3Cu7 cuboctahedra, and faces with ten equivalent Cu(1)Ca2Cd2Cu8 cuboctahedra. Cd(1) is bonded in a 15-coordinate geometry to two equivalent Ca(1), two equivalent Cu(2), four equivalent Cu(1), six equivalent Cu(3), and one Cd(1) atom. is represented by the CIF file [CIF]
data_CaCd2Cu9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.104
_cell_length_b   8.346
_cell_length_c   8.346
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   355.527
_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
  Ca  Ca0  1  0.000  0.500  0.500  1.0
  Ca  Ca1  1  0.000  0.000  0.000  1.0
  Cd  Cd2  1  0.000  0.123  0.623  1.0
  Cd  Cd3  1  0.000  0.877  0.377  1.0
  Cd  Cd4  1  0.000  0.377  0.123  1.0
  Cd  Cd5  1  0.000  0.623  0.877  1.0
  Cu  Cu6  1  0.500  0.564  0.706  1.0
  Cu  Cu7  1  0.500  0.436  0.294  1.0
  Cu  Cu8  1  0.500  0.936  0.206  1.0
  Cu  Cu9  1  0.500  0.064  0.794  1.0
  Cu  Cu10  1  0.500  0.706  0.436  1.0
  Cu  Cu11  1  0.500  0.294  0.564  1.0
  Cu  Cu12  1  0.500  0.206  0.064  1.0
  Cu  Cu13  1  0.500  0.794  0.936  1.0
  Cu  Cu14  1  0.500  0.000  0.500  1.0
  Cu  Cu15  1  0.500  0.500  0.000  1.0
  Cu  Cu16  1  0.753  0.322  0.822  1.0
  Cu  Cu17  1  0.753  0.678  0.178  1.0
  Cu  Cu18  1  0.753  0.178  0.322  1.0
  Cu  Cu19  1  0.753  0.822  0.678  1.0
  Cu  Cu20  1  0.247  0.678  0.178  1.0
  Cu  Cu21  1  0.247  0.322  0.822  1.0
  Cu  Cu22  1  0.247  0.822  0.678  1.0
  Cu  Cu23  1  0.247  0.178  0.322  1.0
[/CIF]
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