The structure described by Ba3Al2Ge2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to two equivalent Al(1) and five equivalent Ge(1) atoms. In the second Ba site, Ba(2) is bonded to eight equivalent Al(1) and four equivalent Ge(1) atoms to form a mixture of face and edge-sharing BaAl8Ge4 cuboctahedra. Al(1) is bonded in a 9-coordinate geometry to two equivalent Ba(1), four equivalent Ba(2), one Al(1), and two equivalent Ge(1) atoms. Ge(1) is bonded in a 9-coordinate geometry to two equivalent Ba(2), five equivalent Ba(1), and two equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_Ba3(AlGe)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.362
_cell_length_b   5.181
_cell_length_c   10.558
_cell_angle_alpha   104.185
_cell_angle_beta   101.921
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   226.032
_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
  Ba  Ba0  1  0.816  0.816  0.632  1.0
  Ba  Ba1  1  0.500  0.000  0.000  1.0
  Ba  Ba2  1  0.184  0.184  0.368  1.0
  Al  Al3  1  0.935  0.435  0.871  1.0
  Al  Al4  1  0.065  0.565  0.129  1.0
  Ge  Ge5  1  0.366  0.367  0.731  1.0
  Ge  Ge6  1  0.634  0.633  0.269  1.0
[/CIF]
.
The structure described by Ba3Al2Ge2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to two equivalent Al(1) and five equivalent Ge(1) atoms. In the second Ba site, Ba(2) is bonded to eight equivalent Al(1) and four equivalent Ge(1) atoms to form a mixture of face and edge-sharing BaAl8Ge4 cuboctahedra. Al(1) is bonded in a 9-coordinate geometry to two equivalent Ba(1), four equivalent Ba(2), one Al(1), and two equivalent Ge(1) atoms. Ge(1) is bonded in a 9-coordinate geometry to two equivalent Ba(2), five equivalent Ba(1), and two equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_Ba3(AlGe)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.362
_cell_length_b   5.181
_cell_length_c   10.558
_cell_angle_alpha   104.185
_cell_angle_beta   101.921
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   226.032
_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
  Ba  Ba0  1  0.816  0.816  0.632  1.0
  Ba  Ba1  1  0.500  0.000  0.000  1.0
  Ba  Ba2  1  0.184  0.184  0.368  1.0
  Al  Al3  1  0.935  0.435  0.871  1.0
  Al  Al4  1  0.065  0.565  0.129  1.0
  Ge  Ge5  1  0.366  0.367  0.731  1.0
  Ge  Ge6  1  0.634  0.633  0.269  1.0
[/CIF]
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