The compound described by Th3Eu is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Th(1) is bonded to eight equivalent Th(1) and four equivalent Eu(1) atoms to form ThEu4Th8 cuboctahedra that share corners with four equivalent Eu(1)Th12 cuboctahedra, corners with fourteen equivalent Th(1)Eu4Th8 cuboctahedra, edges with six equivalent Eu(1)Th12 cuboctahedra, edges with twelve equivalent Th(1)Eu4Th8 cuboctahedra, faces with four equivalent Eu(1)Th12 cuboctahedra, and faces with sixteen equivalent Th(1)Eu4Th8 cuboctahedra. Eu(1) is bonded to twelve equivalent Th(1) atoms to form EuTh12 cuboctahedra that share corners with six equivalent Eu(1)Th12 cuboctahedra, corners with twelve equivalent Th(1)Eu4Th8 cuboctahedra, edges with eighteen equivalent Th(1)Eu4Th8 cuboctahedra, faces with eight equivalent Eu(1)Th12 cuboctahedra, and faces with twelve equivalent Th(1)Eu4Th8 cuboctahedra. is represented by the CIF card [CIF]
data_EuTh3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.177
_cell_length_b   7.177
_cell_length_c   5.939
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   264.907
_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
  Eu  Eu0  1  0.333  0.667  0.750  1.0
  Eu  Eu1  1  0.667  0.333  0.250  1.0
  Th  Th2  1  0.166  0.332  0.250  1.0
  Th  Th3  1  0.668  0.834  0.250  1.0
  Th  Th4  1  0.166  0.834  0.250  1.0
  Th  Th5  1  0.834  0.668  0.750  1.0
  Th  Th6  1  0.332  0.166  0.750  1.0
  Th  Th7  1  0.834  0.166  0.750  1.0
[/CIF]
.
The compound described by Th3Eu is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Th(1) is bonded to eight equivalent Th(1) and four equivalent Eu(1) atoms to form ThEu4Th8 cuboctahedra that share corners with four equivalent Eu(1)Th12 cuboctahedra, corners with fourteen equivalent Th(1)Eu4Th8 cuboctahedra, edges with six equivalent Eu(1)Th12 cuboctahedra, edges with twelve equivalent Th(1)Eu4Th8 cuboctahedra, faces with four equivalent Eu(1)Th12 cuboctahedra, and faces with sixteen equivalent Th(1)Eu4Th8 cuboctahedra. Eu(1) is bonded to twelve equivalent Th(1) atoms to form EuTh12 cuboctahedra that share corners with six equivalent Eu(1)Th12 cuboctahedra, corners with twelve equivalent Th(1)Eu4Th8 cuboctahedra, edges with eighteen equivalent Th(1)Eu4Th8 cuboctahedra, faces with eight equivalent Eu(1)Th12 cuboctahedra, and faces with twelve equivalent Th(1)Eu4Th8 cuboctahedra. is represented by the CIF card [CIF]
data_EuTh3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.177
_cell_length_b   7.177
_cell_length_c   5.939
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   264.907
_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
  Eu  Eu0  1  0.333  0.667  0.750  1.0
  Eu  Eu1  1  0.667  0.333  0.250  1.0
  Th  Th2  1  0.166  0.332  0.250  1.0
  Th  Th3  1  0.668  0.834  0.250  1.0
  Th  Th4  1  0.166  0.834  0.250  1.0
  Th  Th5  1  0.834  0.668  0.750  1.0
  Th  Th6  1  0.332  0.166  0.750  1.0
  Th  Th7  1  0.834  0.166  0.750  1.0
[/CIF]
.