The structure described by ErLa3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Er(1) is bonded to four equivalent La(2) and eight equivalent La(1) atoms to form ErLa12 cuboctahedra that share corners with four equivalent Er(1)La12 cuboctahedra, corners with eight equivalent La(2)La8Er4 cuboctahedra, edges with eight equivalent Er(1)La12 cuboctahedra, edges with sixteen equivalent La(1)La8Er4 cuboctahedra, faces with four equivalent Er(1)La12 cuboctahedra, faces with six equivalent La(2)La8Er4 cuboctahedra, and faces with eight equivalent La(1)La8Er4 cuboctahedra. There are two inequivalent La sites. In the first La site, La(1) is bonded to four equivalent Er(1), four equivalent La(1), and four equivalent La(2) atoms to form LaLa8Er4 cuboctahedra that share corners with twelve equivalent La(1)La8Er4 cuboctahedra, edges with eight equivalent Er(1)La12 cuboctahedra, edges with eight equivalent La(1)La8Er4 cuboctahedra, edges with eight equivalent La(2)La8Er4 cuboctahedra, faces with four equivalent Er(1)La12 cuboctahedra, faces with four equivalent La(2)La8Er4 cuboctahedra, and faces with ten equivalent La(1)La8Er4 cuboctahedra. In the second La site, La(2) is bonded to four equivalent Er(1) and eight equivalent La(1) atoms to form LaLa8Er4 cuboctahedra that share corners with four equivalent La(2)La8Er4 cuboctahedra, corners with eight equivalent Er(1)La12 cuboctahedra, edges with eight equivalent La(2)La8Er4 cuboctahedra, edges with sixteen equivalent La(1)La8Er4 cuboctahedra, faces with four equivalent La(2)La8Er4 cuboctahedra, faces with six equivalent Er(1)La12 cuboctahedra, and faces with eight equivalent La(1)La8Er4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_La3Er
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.410
_cell_length_b   6.410
_cell_length_c   6.410
_cell_angle_alpha   132.161
_cell_angle_beta   132.161
_cell_angle_gamma   69.975
_symmetry_Int_Tables_number   1
_cell_volume   141.900
_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  0.750  0.250  0.500  1.0
  La  La1  1  0.250  0.750  0.500  1.0
  La  La2  1  0.500  0.500  0.000  1.0
  Er  Er3  1  0.000  0.000  0.000  1.0
[/CIF]
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The structure described by ErLa3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Er(1) is bonded to four equivalent La(2) and eight equivalent La(1) atoms to form ErLa12 cuboctahedra that share corners with four equivalent Er(1)La12 cuboctahedra, corners with eight equivalent La(2)La8Er4 cuboctahedra, edges with eight equivalent Er(1)La12 cuboctahedra, edges with sixteen equivalent La(1)La8Er4 cuboctahedra, faces with four equivalent Er(1)La12 cuboctahedra, faces with six equivalent La(2)La8Er4 cuboctahedra, and faces with eight equivalent La(1)La8Er4 cuboctahedra. There are two inequivalent La sites. In the first La site, La(1) is bonded to four equivalent Er(1), four equivalent La(1), and four equivalent La(2) atoms to form LaLa8Er4 cuboctahedra that share corners with twelve equivalent La(1)La8Er4 cuboctahedra, edges with eight equivalent Er(1)La12 cuboctahedra, edges with eight equivalent La(1)La8Er4 cuboctahedra, edges with eight equivalent La(2)La8Er4 cuboctahedra, faces with four equivalent Er(1)La12 cuboctahedra, faces with four equivalent La(2)La8Er4 cuboctahedra, and faces with ten equivalent La(1)La8Er4 cuboctahedra. In the second La site, La(2) is bonded to four equivalent Er(1) and eight equivalent La(1) atoms to form LaLa8Er4 cuboctahedra that share corners with four equivalent La(2)La8Er4 cuboctahedra, corners with eight equivalent Er(1)La12 cuboctahedra, edges with eight equivalent La(2)La8Er4 cuboctahedra, edges with sixteen equivalent La(1)La8Er4 cuboctahedra, faces with four equivalent La(2)La8Er4 cuboctahedra, faces with six equivalent Er(1)La12 cuboctahedra, and faces with eight equivalent La(1)La8Er4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_La3Er
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.410
_cell_length_b   6.410
_cell_length_c   6.410
_cell_angle_alpha   132.161
_cell_angle_beta   132.161
_cell_angle_gamma   69.975
_symmetry_Int_Tables_number   1
_cell_volume   141.900
_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  0.750  0.250  0.500  1.0
  La  La1  1  0.250  0.750  0.500  1.0
  La  La2  1  0.500  0.500  0.000  1.0
  Er  Er3  1  0.000  0.000  0.000  1.0
[/CIF]
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