The structure described by ULa3Al8 is Hexagonal Laves-derived structured and crystallizes in the trigonal R3m space group. U(1) is bonded in a 16-coordinate geometry to one La(2), three equivalent La(3), three equivalent Al(2), three equivalent Al(3), and six equivalent Al(1) atoms. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 12-coordinate geometry to one La(3), three equivalent La(2), three equivalent Al(1), three equivalent Al(4), and six equivalent Al(2) atoms. In the second La site, La(2) is bonded in a 16-coordinate geometry to one U(1), three equivalent La(1), three equivalent Al(2), three equivalent Al(4), and six equivalent Al(1) atoms. In the third La site, La(3) is bonded in a 16-coordinate geometry to three equivalent U(1), one La(1), three equivalent Al(1), three equivalent Al(3), and six equivalent Al(2) atoms. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent U(1), one La(1), one La(3), two equivalent La(2), one Al(3), one Al(4), and four equivalent Al(1) atoms to form AlLa4U2Al6 cuboctahedra that share corners with two equivalent Al(3)La3U3Al6 cuboctahedra, corners with two equivalent Al(4)La6Al6 cuboctahedra, corners with four equivalent Al(1)La4U2Al6 cuboctahedra, corners with ten equivalent Al(2)La5UAl6 cuboctahedra, edges with two equivalent Al(1)La4U2Al6 cuboctahedra, edges with four equivalent Al(2)La5UAl6 cuboctahedra, faces with three equivalent Al(3)La3U3Al6 cuboctahedra, faces with three equivalent Al(4)La6Al6 cuboctahedra, faces with four equivalent Al(2)La5UAl6 cuboctahedra, and faces with eight equivalent Al(1)La4U2Al6 cuboctahedra. In the second Al site, Al(2) is bonded to one U(1), one La(2), two equivalent La(1), two equivalent La(3), one Al(3), one Al(4), and four equivalent Al(2) atoms to form AlLa5UAl6 cuboctahedra that share corners with two equivalent Al(3)La3U3Al6 cuboctahedra, corners with two equivalent Al(4)La6Al6 cuboctahedra, corners with four equivalent Al(2)La5UAl6 cuboctahedra, corners with ten equivalent Al(1)La4U2Al6 cuboctahedra, edges with two equivalent Al(2)La5UAl6 cuboctahedra, edges with four equivalent Al(1)La4U2Al6 cuboctahedra, faces with three equivalent Al(3)La3U3Al6 cuboctahedra, faces with three equivalent Al(4)La6Al6 cuboctahedra, faces with four equivalent Al(1)La4U2Al6 cuboctahedra, and faces with eight equivalent Al(2)La5UAl6 cuboctahedra. In the third Al site, Al(3) is bonded to three equivalent U(1), three equivalent La(3), three equivalent Al(1), and three equivalent Al(2) atoms to form AlLa3U3Al6 cuboctahedra that share corners with six equivalent Al(1)La4U2Al6 cuboctahedra, corners with six equivalent Al(2)La5UAl6 cuboctahedra, corners with six equivalent Al(4)La6Al6 cuboctahedra, edges with six equivalent Al(3)La3U3Al6 cuboctahedra, faces with nine equivalent Al(1)La4U2Al6 cuboctahedra, and faces with nine equivalent Al(2)La5UAl6 cuboctahedra. In the fourth Al site, Al(4) is bonded to three equivalent La(1), three equivalent La(2), three equivalent Al(1), and three equivalent Al(2) atoms to form AlLa6Al6 cuboctahedra that share corners with six equivalent Al(3)La3U3Al6 cuboctahedra, corners with six equivalent Al(1)La4U2Al6 cuboctahedra, corners with six equivalent Al(2)La5UAl6 cuboctahedra, edges with six equivalent Al(4)La6Al6 cuboctahedra, faces with nine equivalent Al(1)La4U2Al6 cuboctahedra, and faces with nine equivalent Al(2)La5UAl6 cuboctahedra. is represented by the CIF card [CIF]
data_La3UAl8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.893
_cell_length_b   9.893
_cell_length_c   9.893
_cell_angle_alpha   33.397
_cell_angle_beta   33.397
_cell_angle_gamma   33.397
_symmetry_Int_Tables_number   1
_cell_volume   261.256
_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
  La  La0  1  0.625  0.625  0.625  1.0
  La  La1  1  0.002  0.002  0.002  1.0
  La  La2  1  0.498  0.498  0.498  1.0
  U  U3  1  0.125  0.125  0.125  1.0
  Al  Al4  1  0.564  0.564  0.064  1.0
  Al  Al5  1  0.063  0.063  0.558  1.0
  Al  Al6  1  0.564  0.064  0.564  1.0
  Al  Al7  1  0.063  0.558  0.063  1.0
  Al  Al8  1  0.812  0.812  0.812  1.0
  Al  Al9  1  0.312  0.312  0.312  1.0
  Al  Al10  1  0.064  0.564  0.564  1.0
  Al  Al11  1  0.558  0.063  0.063  1.0
[/CIF]
.
The structure described by ULa3Al8 is Hexagonal Laves-derived structured and crystallizes in the trigonal R3m space group. U(1) is bonded in a 16-coordinate geometry to one La(2), three equivalent La(3), three equivalent Al(2), three equivalent Al(3), and six equivalent Al(1) atoms. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 12-coordinate geometry to one La(3), three equivalent La(2), three equivalent Al(1), three equivalent Al(4), and six equivalent Al(2) atoms. In the second La site, La(2) is bonded in a 16-coordinate geometry to one U(1), three equivalent La(1), three equivalent Al(2), three equivalent Al(4), and six equivalent Al(1) atoms. In the third La site, La(3) is bonded in a 16-coordinate geometry to three equivalent U(1), one La(1), three equivalent Al(1), three equivalent Al(3), and six equivalent Al(2) atoms. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent U(1), one La(1), one La(3), two equivalent La(2), one Al(3), one Al(4), and four equivalent Al(1) atoms to form AlLa4U2Al6 cuboctahedra that share corners with two equivalent Al(3)La3U3Al6 cuboctahedra, corners with two equivalent Al(4)La6Al6 cuboctahedra, corners with four equivalent Al(1)La4U2Al6 cuboctahedra, corners with ten equivalent Al(2)La5UAl6 cuboctahedra, edges with two equivalent Al(1)La4U2Al6 cuboctahedra, edges with four equivalent Al(2)La5UAl6 cuboctahedra, faces with three equivalent Al(3)La3U3Al6 cuboctahedra, faces with three equivalent Al(4)La6Al6 cuboctahedra, faces with four equivalent Al(2)La5UAl6 cuboctahedra, and faces with eight equivalent Al(1)La4U2Al6 cuboctahedra. In the second Al site, Al(2) is bonded to one U(1), one La(2), two equivalent La(1), two equivalent La(3), one Al(3), one Al(4), and four equivalent Al(2) atoms to form AlLa5UAl6 cuboctahedra that share corners with two equivalent Al(3)La3U3Al6 cuboctahedra, corners with two equivalent Al(4)La6Al6 cuboctahedra, corners with four equivalent Al(2)La5UAl6 cuboctahedra, corners with ten equivalent Al(1)La4U2Al6 cuboctahedra, edges with two equivalent Al(2)La5UAl6 cuboctahedra, edges with four equivalent Al(1)La4U2Al6 cuboctahedra, faces with three equivalent Al(3)La3U3Al6 cuboctahedra, faces with three equivalent Al(4)La6Al6 cuboctahedra, faces with four equivalent Al(1)La4U2Al6 cuboctahedra, and faces with eight equivalent Al(2)La5UAl6 cuboctahedra. In the third Al site, Al(3) is bonded to three equivalent U(1), three equivalent La(3), three equivalent Al(1), and three equivalent Al(2) atoms to form AlLa3U3Al6 cuboctahedra that share corners with six equivalent Al(1)La4U2Al6 cuboctahedra, corners with six equivalent Al(2)La5UAl6 cuboctahedra, corners with six equivalent Al(4)La6Al6 cuboctahedra, edges with six equivalent Al(3)La3U3Al6 cuboctahedra, faces with nine equivalent Al(1)La4U2Al6 cuboctahedra, and faces with nine equivalent Al(2)La5UAl6 cuboctahedra. In the fourth Al site, Al(4) is bonded to three equivalent La(1), three equivalent La(2), three equivalent Al(1), and three equivalent Al(2) atoms to form AlLa6Al6 cuboctahedra that share corners with six equivalent Al(3)La3U3Al6 cuboctahedra, corners with six equivalent Al(1)La4U2Al6 cuboctahedra, corners with six equivalent Al(2)La5UAl6 cuboctahedra, edges with six equivalent Al(4)La6Al6 cuboctahedra, faces with nine equivalent Al(1)La4U2Al6 cuboctahedra, and faces with nine equivalent Al(2)La5UAl6 cuboctahedra. is represented by the CIF card [CIF]
data_La3UAl8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.893
_cell_length_b   9.893
_cell_length_c   9.893
_cell_angle_alpha   33.397
_cell_angle_beta   33.397
_cell_angle_gamma   33.397
_symmetry_Int_Tables_number   1
_cell_volume   261.256
_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
  La  La0  1  0.625  0.625  0.625  1.0
  La  La1  1  0.002  0.002  0.002  1.0
  La  La2  1  0.498  0.498  0.498  1.0
  U  U3  1  0.125  0.125  0.125  1.0
  Al  Al4  1  0.564  0.564  0.064  1.0
  Al  Al5  1  0.063  0.063  0.558  1.0
  Al  Al6  1  0.564  0.064  0.564  1.0
  Al  Al7  1  0.063  0.558  0.063  1.0
  Al  Al8  1  0.812  0.812  0.812  1.0
  Al  Al9  1  0.312  0.312  0.312  1.0
  Al  Al10  1  0.064  0.564  0.564  1.0
  Al  Al11  1  0.558  0.063  0.063  1.0
[/CIF]
.