The material described by CeMn2Cu9 crystallizes in the tetragonal P4/mbm space group. Ce(1) is bonded in a 20-coordinate geometry to four equivalent Mn(1), eight equivalent Cu(1), and eight equivalent Cu(2) atoms. Mn(1) is bonded in a 15-coordinate geometry to two equivalent Ce(1), one Mn(1), two equivalent Cu(3), four equivalent Cu(2), and six equivalent Cu(1) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Ce(1), three equivalent Mn(1), one Cu(3), two equivalent Cu(1), and four equivalent Cu(2) atoms to form distorted CuCe2Mn3Cu7 cuboctahedra that share  a cornercorner with one Cu(3)Mn4Cu8 cuboctahedra, corners with six equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, corners with eleven equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, edges with four equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, edges with five equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, faces with three equivalent Cu(3)Mn4Cu8 cuboctahedra, faces with seven equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, and faces with ten equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Ce(1), two equivalent Mn(1), one Cu(3), three equivalent Cu(2), and four equivalent Cu(1) atoms to form distorted CuCe2Mn2Cu8 cuboctahedra that share corners with three equivalent Cu(3)Mn4Cu8 cuboctahedra, corners with six equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, corners with eleven equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, edges with two equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, edges with four equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, faces with two equivalent Cu(3)Mn4Cu8 cuboctahedra, faces with seven equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, and faces with ten equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra. In the third Cu site, Cu(3) is bonded to four equivalent Mn(1), four equivalent Cu(1), and four equivalent Cu(2) atoms to form CuMn4Cu8 cuboctahedra that share corners with four equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, corners with twelve equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, edges with two equivalent Cu(3)Mn4Cu8 cuboctahedra, faces with eight equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, and faces with twelve equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra. is represented by the CIF file [CIF]
data_CeMn2Cu9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.908
_cell_length_b   8.289
_cell_length_c   8.289
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   337.266
_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
  Ce  Ce0  1  0.000  0.000  0.000  1.0
  Ce  Ce1  1  0.000  0.500  0.500  1.0
  Mn  Mn2  1  0.000  0.616  0.116  1.0
  Mn  Mn3  1  0.000  0.384  0.884  1.0
  Mn  Mn4  1  0.000  0.884  0.616  1.0
  Mn  Mn5  1  0.000  0.116  0.384  1.0
  Cu  Cu6  1  0.240  0.179  0.679  1.0
  Cu  Cu7  1  0.760  0.821  0.321  1.0
  Cu  Cu8  1  0.240  0.821  0.321  1.0
  Cu  Cu9  1  0.240  0.321  0.179  1.0
  Cu  Cu10  1  0.760  0.321  0.179  1.0
  Cu  Cu11  1  0.760  0.179  0.679  1.0
  Cu  Cu12  1  0.760  0.679  0.821  1.0
  Cu  Cu13  1  0.240  0.679  0.821  1.0
  Cu  Cu14  1  0.500  0.065  0.210  1.0
  Cu  Cu15  1  0.500  0.935  0.790  1.0
  Cu  Cu16  1  0.500  0.790  0.065  1.0
  Cu  Cu17  1  0.500  0.435  0.710  1.0
  Cu  Cu18  1  0.500  0.210  0.935  1.0
  Cu  Cu19  1  0.500  0.565  0.290  1.0
  Cu  Cu20  1  0.500  0.710  0.565  1.0
  Cu  Cu21  1  0.500  0.290  0.435  1.0
  Cu  Cu22  1  0.500  0.000  0.500  1.0
  Cu  Cu23  1  0.500  0.500  0.000  1.0
[/CIF]
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The material described by CeMn2Cu9 crystallizes in the tetragonal P4/mbm space group. Ce(1) is bonded in a 20-coordinate geometry to four equivalent Mn(1), eight equivalent Cu(1), and eight equivalent Cu(2) atoms. Mn(1) is bonded in a 15-coordinate geometry to two equivalent Ce(1), one Mn(1), two equivalent Cu(3), four equivalent Cu(2), and six equivalent Cu(1) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Ce(1), three equivalent Mn(1), one Cu(3), two equivalent Cu(1), and four equivalent Cu(2) atoms to form distorted CuCe2Mn3Cu7 cuboctahedra that share  a cornercorner with one Cu(3)Mn4Cu8 cuboctahedra, corners with six equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, corners with eleven equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, edges with four equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, edges with five equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, faces with three equivalent Cu(3)Mn4Cu8 cuboctahedra, faces with seven equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, and faces with ten equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Ce(1), two equivalent Mn(1), one Cu(3), three equivalent Cu(2), and four equivalent Cu(1) atoms to form distorted CuCe2Mn2Cu8 cuboctahedra that share corners with three equivalent Cu(3)Mn4Cu8 cuboctahedra, corners with six equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, corners with eleven equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, edges with two equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, edges with four equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, faces with two equivalent Cu(3)Mn4Cu8 cuboctahedra, faces with seven equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, and faces with ten equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra. In the third Cu site, Cu(3) is bonded to four equivalent Mn(1), four equivalent Cu(1), and four equivalent Cu(2) atoms to form CuMn4Cu8 cuboctahedra that share corners with four equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra, corners with twelve equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, edges with two equivalent Cu(3)Mn4Cu8 cuboctahedra, faces with eight equivalent Cu(2)Ce2Mn2Cu8 cuboctahedra, and faces with twelve equivalent Cu(1)Ce2Mn3Cu7 cuboctahedra. is represented by the CIF file [CIF]
data_CeMn2Cu9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.908
_cell_length_b   8.289
_cell_length_c   8.289
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   337.266
_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
  Ce  Ce0  1  0.000  0.000  0.000  1.0
  Ce  Ce1  1  0.000  0.500  0.500  1.0
  Mn  Mn2  1  0.000  0.616  0.116  1.0
  Mn  Mn3  1  0.000  0.384  0.884  1.0
  Mn  Mn4  1  0.000  0.884  0.616  1.0
  Mn  Mn5  1  0.000  0.116  0.384  1.0
  Cu  Cu6  1  0.240  0.179  0.679  1.0
  Cu  Cu7  1  0.760  0.821  0.321  1.0
  Cu  Cu8  1  0.240  0.821  0.321  1.0
  Cu  Cu9  1  0.240  0.321  0.179  1.0
  Cu  Cu10  1  0.760  0.321  0.179  1.0
  Cu  Cu11  1  0.760  0.179  0.679  1.0
  Cu  Cu12  1  0.760  0.679  0.821  1.0
  Cu  Cu13  1  0.240  0.679  0.821  1.0
  Cu  Cu14  1  0.500  0.065  0.210  1.0
  Cu  Cu15  1  0.500  0.935  0.790  1.0
  Cu  Cu16  1  0.500  0.790  0.065  1.0
  Cu  Cu17  1  0.500  0.435  0.710  1.0
  Cu  Cu18  1  0.500  0.210  0.935  1.0
  Cu  Cu19  1  0.500  0.565  0.290  1.0
  Cu  Cu20  1  0.500  0.710  0.565  1.0
  Cu  Cu21  1  0.500  0.290  0.435  1.0
  Cu  Cu22  1  0.500  0.000  0.500  1.0
  Cu  Cu23  1  0.500  0.500  0.000  1.0
[/CIF]
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