The structure described by CeMn4Al8 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded in a 20-coordinate geometry to eight equivalent Mn(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Mn(1) is bonded to two equivalent Ce(1), two equivalent Mn(1), four equivalent Al(1), and four equivalent Al(2) atoms to form distorted MnCe2Mn2Al8 cuboctahedra that share corners with eight equivalent Al(2)Ce2Mn4Al6 cuboctahedra, corners with ten equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, edges with four equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, edges with four equivalent Al(2)Ce2Mn4Al6 cuboctahedra, faces with six equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, and faces with eight equivalent Al(2)Ce2Mn4Al6 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Ce(1), four equivalent Mn(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to two equivalent Ce(1), four equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms to form distorted AlCe2Mn4Al6 cuboctahedra that share corners with eight equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, corners with ten equivalent Al(2)Ce2Mn4Al6 cuboctahedra, edges with three equivalent Al(2)Ce2Mn4Al6 cuboctahedra, edges with four equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, faces with seven equivalent Al(2)Ce2Mn4Al6 cuboctahedra, and faces with eight equivalent Mn(1)Ce2Mn2Al8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce(MnAl2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.171
_cell_length_b   6.801
_cell_length_c   6.801
_cell_angle_alpha   81.688
_cell_angle_beta   67.653
_cell_angle_gamma   67.653
_symmetry_Int_Tables_number   1
_cell_volume   204.589
_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
  Ce  Ce0  1  0.000  0.000  0.000  1.0
  Mn  Mn1  1  0.000  0.000  0.500  1.0
  Mn  Mn2  1  0.500  0.000  0.500  1.0
  Mn  Mn3  1  0.000  0.500  0.000  1.0
  Mn  Mn4  1  0.500  0.500  0.000  1.0
  Al  Al5  1  0.344  0.656  0.656  1.0
  Al  Al6  1  0.000  0.344  0.656  1.0
  Al  Al7  1  0.000  0.656  0.344  1.0
  Al  Al8  1  0.656  0.344  0.344  1.0
  Al  Al9  1  0.273  0.227  0.227  1.0
  Al  Al10  1  0.500  0.773  0.227  1.0
  Al  Al11  1  0.500  0.227  0.773  1.0
  Al  Al12  1  0.727  0.773  0.773  1.0
[/CIF]
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The structure described by CeMn4Al8 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded in a 20-coordinate geometry to eight equivalent Mn(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Mn(1) is bonded to two equivalent Ce(1), two equivalent Mn(1), four equivalent Al(1), and four equivalent Al(2) atoms to form distorted MnCe2Mn2Al8 cuboctahedra that share corners with eight equivalent Al(2)Ce2Mn4Al6 cuboctahedra, corners with ten equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, edges with four equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, edges with four equivalent Al(2)Ce2Mn4Al6 cuboctahedra, faces with six equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, and faces with eight equivalent Al(2)Ce2Mn4Al6 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Ce(1), four equivalent Mn(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to two equivalent Ce(1), four equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms to form distorted AlCe2Mn4Al6 cuboctahedra that share corners with eight equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, corners with ten equivalent Al(2)Ce2Mn4Al6 cuboctahedra, edges with three equivalent Al(2)Ce2Mn4Al6 cuboctahedra, edges with four equivalent Mn(1)Ce2Mn2Al8 cuboctahedra, faces with seven equivalent Al(2)Ce2Mn4Al6 cuboctahedra, and faces with eight equivalent Mn(1)Ce2Mn2Al8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce(MnAl2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.171
_cell_length_b   6.801
_cell_length_c   6.801
_cell_angle_alpha   81.688
_cell_angle_beta   67.653
_cell_angle_gamma   67.653
_symmetry_Int_Tables_number   1
_cell_volume   204.589
_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
  Ce  Ce0  1  0.000  0.000  0.000  1.0
  Mn  Mn1  1  0.000  0.000  0.500  1.0
  Mn  Mn2  1  0.500  0.000  0.500  1.0
  Mn  Mn3  1  0.000  0.500  0.000  1.0
  Mn  Mn4  1  0.500  0.500  0.000  1.0
  Al  Al5  1  0.344  0.656  0.656  1.0
  Al  Al6  1  0.000  0.344  0.656  1.0
  Al  Al7  1  0.000  0.656  0.344  1.0
  Al  Al8  1  0.656  0.344  0.344  1.0
  Al  Al9  1  0.273  0.227  0.227  1.0
  Al  Al10  1  0.500  0.773  0.227  1.0
  Al  Al11  1  0.500  0.227  0.773  1.0
  Al  Al12  1  0.727  0.773  0.773  1.0
[/CIF]
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