The structure described by UMnAl is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the orthorhombic Imma space group. U(1) is bonded in a 14-coordinate geometry to two equivalent U(1), six equivalent Mn(1), and six equivalent Al(1) atoms. Mn(1) is bonded to six equivalent U(1), two equivalent Mn(1), and four equivalent Al(1) atoms to form distorted MnU6Mn2Al4 cuboctahedra that share corners with eight equivalent Al(1)U6Mn4Al2 cuboctahedra, corners with ten equivalent Mn(1)U6Mn2Al4 cuboctahedra, edges with six equivalent Mn(1)U6Mn2Al4 cuboctahedra, faces with six equivalent Mn(1)U6Mn2Al4 cuboctahedra, and faces with twelve equivalent Al(1)U6Mn4Al2 cuboctahedra. Al(1) is bonded to six equivalent U(1), four equivalent Mn(1), and two equivalent Al(1) atoms to form AlU6Mn4Al2 cuboctahedra that share corners with eight equivalent Mn(1)U6Mn2Al4 cuboctahedra, corners with ten equivalent Al(1)U6Mn4Al2 cuboctahedra, edges with six equivalent Al(1)U6Mn4Al2 cuboctahedra, faces with six equivalent Al(1)U6Mn4Al2 cuboctahedra, and faces with twelve equivalent Mn(1)U6Mn2Al4 cuboctahedra. is represented by the CIF file [CIF]
data_UMnAl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.145
_cell_length_b   5.145
_cell_length_c   5.145
_cell_angle_alpha   119.936
_cell_angle_beta   115.067
_cell_angle_gamma   94.433
_symmetry_Int_Tables_number   1
_cell_volume   99.393
_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
  U  U0  1  0.412  0.162  0.250  1.0
  U  U1  1  0.588  0.838  0.750  1.0
  Mn  Mn2  1  0.500  0.500  0.000  1.0
  Mn  Mn3  1  0.000  0.500  0.500  1.0
  Al  Al4  1  0.000  0.500  0.000  1.0
  Al  Al5  1  0.000  0.000  0.500  1.0
[/CIF]
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The structure described by UMnAl is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the orthorhombic Imma space group. U(1) is bonded in a 14-coordinate geometry to two equivalent U(1), six equivalent Mn(1), and six equivalent Al(1) atoms. Mn(1) is bonded to six equivalent U(1), two equivalent Mn(1), and four equivalent Al(1) atoms to form distorted MnU6Mn2Al4 cuboctahedra that share corners with eight equivalent Al(1)U6Mn4Al2 cuboctahedra, corners with ten equivalent Mn(1)U6Mn2Al4 cuboctahedra, edges with six equivalent Mn(1)U6Mn2Al4 cuboctahedra, faces with six equivalent Mn(1)U6Mn2Al4 cuboctahedra, and faces with twelve equivalent Al(1)U6Mn4Al2 cuboctahedra. Al(1) is bonded to six equivalent U(1), four equivalent Mn(1), and two equivalent Al(1) atoms to form AlU6Mn4Al2 cuboctahedra that share corners with eight equivalent Mn(1)U6Mn2Al4 cuboctahedra, corners with ten equivalent Al(1)U6Mn4Al2 cuboctahedra, edges with six equivalent Al(1)U6Mn4Al2 cuboctahedra, faces with six equivalent Al(1)U6Mn4Al2 cuboctahedra, and faces with twelve equivalent Mn(1)U6Mn2Al4 cuboctahedra. is represented by the CIF file [CIF]
data_UMnAl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.145
_cell_length_b   5.145
_cell_length_c   5.145
_cell_angle_alpha   119.936
_cell_angle_beta   115.067
_cell_angle_gamma   94.433
_symmetry_Int_Tables_number   1
_cell_volume   99.393
_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
  U  U0  1  0.412  0.162  0.250  1.0
  U  U1  1  0.588  0.838  0.750  1.0
  Mn  Mn2  1  0.500  0.500  0.000  1.0
  Mn  Mn3  1  0.000  0.500  0.500  1.0
  Al  Al4  1  0.000  0.500  0.000  1.0
  Al  Al5  1  0.000  0.000  0.500  1.0
[/CIF]
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