The structure described by LaAl2Ge2 crystallizes in the trigonal P-3m1 space group. La(1) is bonded to six equivalent Ge(1) atoms to form distorted LaGe6 octahedra that share corners with twelve equivalent Al(1)Ge4 tetrahedra, edges with six equivalent La(1)Ge6 octahedra, and edges with six equivalent Al(1)Ge4 tetrahedra. Al(1) is bonded to four equivalent Ge(1) atoms to form AlGe4 tetrahedra that share corners with six equivalent La(1)Ge6 octahedra, corners with six equivalent Al(1)Ge4 tetrahedra, edges with three equivalent La(1)Ge6 octahedra, and edges with three equivalent Al(1)Ge4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-52°. Ge(1) is bonded in a 7-coordinate geometry to three equivalent La(1) and four equivalent Al(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_La(AlGe)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.278
_cell_length_b   4.278
_cell_length_c   7.078
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   112.194
_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  0.000  0.000  0.000  1.0
  Al  Al1  1  0.667  0.333  0.364  1.0
  Al  Al2  1  0.333  0.667  0.636  1.0
  Ge  Ge3  1  0.667  0.333  0.727  1.0
  Ge  Ge4  1  0.333  0.667  0.273  1.0
[/CIF]
.
The structure described by LaAl2Ge2 crystallizes in the trigonal P-3m1 space group. La(1) is bonded to six equivalent Ge(1) atoms to form distorted LaGe6 octahedra that share corners with twelve equivalent Al(1)Ge4 tetrahedra, edges with six equivalent La(1)Ge6 octahedra, and edges with six equivalent Al(1)Ge4 tetrahedra. Al(1) is bonded to four equivalent Ge(1) atoms to form AlGe4 tetrahedra that share corners with six equivalent La(1)Ge6 octahedra, corners with six equivalent Al(1)Ge4 tetrahedra, edges with three equivalent La(1)Ge6 octahedra, and edges with three equivalent Al(1)Ge4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-52°. Ge(1) is bonded in a 7-coordinate geometry to three equivalent La(1) and four equivalent Al(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_La(AlGe)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.278
_cell_length_b   4.278
_cell_length_c   7.078
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   112.194
_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  0.000  0.000  0.000  1.0
  Al  Al1  1  0.667  0.333  0.364  1.0
  Al  Al2  1  0.333  0.667  0.636  1.0
  Ge  Ge3  1  0.667  0.333  0.727  1.0
  Ge  Ge4  1  0.333  0.667  0.273  1.0
[/CIF]
.