The structure described by Al8Cr4Y crystallizes in the tetragonal I4/mmm space group. Y(1) is bonded in a 20-coordinate geometry to eight equivalent Cr(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Cr(1) is bonded to two equivalent Y(1), two equivalent Cr(1), four equivalent Al(1), and four equivalent Al(2) atoms to form distorted CrY2Al8Cr2 cuboctahedra that share corners with eight equivalent Al(2)Y2Al6Cr4 cuboctahedra, corners with ten equivalent Cr(1)Y2Al8Cr2 cuboctahedra, edges with four equivalent Cr(1)Y2Al8Cr2 cuboctahedra, edges with four equivalent Al(2)Y2Al6Cr4 cuboctahedra, faces with six equivalent Cr(1)Y2Al8Cr2 cuboctahedra, and faces with eight equivalent Al(2)Y2Al6Cr4 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Y(1), four equivalent Cr(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to two equivalent Y(1), four equivalent Cr(1), two equivalent Al(2), and four equivalent Al(1) atoms to form distorted AlY2Al6Cr4 cuboctahedra that share corners with eight equivalent Cr(1)Y2Al8Cr2 cuboctahedra, corners with ten equivalent Al(2)Y2Al6Cr4 cuboctahedra, edges with three equivalent Al(2)Y2Al6Cr4 cuboctahedra, edges with four equivalent Cr(1)Y2Al8Cr2 cuboctahedra, faces with seven equivalent Al(2)Y2Al6Cr4 cuboctahedra, and faces with eight equivalent Cr(1)Y2Al8Cr2 cuboctahedra. is represented by the CIF card [CIF]
data_Y(Al2Cr)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.794
_cell_length_b   6.794
_cell_length_c   6.794
_cell_angle_alpha   97.951
_cell_angle_beta   97.951
_cell_angle_gamma   136.331
_symmetry_Int_Tables_number   1
_cell_volume   200.992
_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
  Y  Y0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.663  0.663  1.0
  Al  Al2  1  0.663  0.000  0.663  1.0
  Al  Al3  1  0.337  0.000  0.337  1.0
  Al  Al4  1  0.000  0.337  0.337  1.0
  Al  Al5  1  0.500  0.723  0.223  1.0
  Al  Al6  1  0.723  0.500  0.223  1.0
  Al  Al7  1  0.277  0.500  0.777  1.0
  Al  Al8  1  0.500  0.277  0.777  1.0
  Cr  Cr9  1  0.500  0.500  0.500  1.0
  Cr  Cr10  1  0.500  0.000  0.000  1.0
  Cr  Cr11  1  0.000  0.500  0.000  1.0
  Cr  Cr12  1  0.000  0.000  0.500  1.0
[/CIF]
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The structure described by Al8Cr4Y crystallizes in the tetragonal I4/mmm space group. Y(1) is bonded in a 20-coordinate geometry to eight equivalent Cr(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Cr(1) is bonded to two equivalent Y(1), two equivalent Cr(1), four equivalent Al(1), and four equivalent Al(2) atoms to form distorted CrY2Al8Cr2 cuboctahedra that share corners with eight equivalent Al(2)Y2Al6Cr4 cuboctahedra, corners with ten equivalent Cr(1)Y2Al8Cr2 cuboctahedra, edges with four equivalent Cr(1)Y2Al8Cr2 cuboctahedra, edges with four equivalent Al(2)Y2Al6Cr4 cuboctahedra, faces with six equivalent Cr(1)Y2Al8Cr2 cuboctahedra, and faces with eight equivalent Al(2)Y2Al6Cr4 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Y(1), four equivalent Cr(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to two equivalent Y(1), four equivalent Cr(1), two equivalent Al(2), and four equivalent Al(1) atoms to form distorted AlY2Al6Cr4 cuboctahedra that share corners with eight equivalent Cr(1)Y2Al8Cr2 cuboctahedra, corners with ten equivalent Al(2)Y2Al6Cr4 cuboctahedra, edges with three equivalent Al(2)Y2Al6Cr4 cuboctahedra, edges with four equivalent Cr(1)Y2Al8Cr2 cuboctahedra, faces with seven equivalent Al(2)Y2Al6Cr4 cuboctahedra, and faces with eight equivalent Cr(1)Y2Al8Cr2 cuboctahedra. is represented by the CIF card [CIF]
data_Y(Al2Cr)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.794
_cell_length_b   6.794
_cell_length_c   6.794
_cell_angle_alpha   97.951
_cell_angle_beta   97.951
_cell_angle_gamma   136.331
_symmetry_Int_Tables_number   1
_cell_volume   200.992
_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
  Y  Y0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.663  0.663  1.0
  Al  Al2  1  0.663  0.000  0.663  1.0
  Al  Al3  1  0.337  0.000  0.337  1.0
  Al  Al4  1  0.000  0.337  0.337  1.0
  Al  Al5  1  0.500  0.723  0.223  1.0
  Al  Al6  1  0.723  0.500  0.223  1.0
  Al  Al7  1  0.277  0.500  0.777  1.0
  Al  Al8  1  0.500  0.277  0.777  1.0
  Cr  Cr9  1  0.500  0.500  0.500  1.0
  Cr  Cr10  1  0.500  0.000  0.000  1.0
  Cr  Cr11  1  0.000  0.500  0.000  1.0
  Cr  Cr12  1  0.000  0.000  0.500  1.0
[/CIF]
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