data_Al2SiGe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.61
_cell_length_b   4.61
_cell_length_c   3.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   102.11
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Al2SiGe
_chemical_formula_sum   'Al2 Si1 Ge1'
_cell_volume   66.52
_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
  Al  Al0  1  0.45  0.79  0.6  1.0
  Al  Al1  1  0.45  0.21  0.6  1.0
  Si  Si3  1  0.0  0.0  0.0  1.0
  Ge  Ge2  1  0.9  0.0  0.0  1.0

data_Al2SiGe
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.21
_cell_length_b   4.61
_cell_length_c   4.61
_cell_angle_alpha   102.11
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Al2SiGe
_chemical_formula_sum   'Al2 Si1 Ge1'
_cell_volume   66.52
_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
  Al  Al0  1  0.6  0.45  0.21  1.0
  Al  Al1  1  0.6  0.45  0.79  1.0
  Si  Si2  1  0.0  0.0  0.0  1.0
  Ge  Ge3  1  -0.0  0.9  0.0  1.0

Al Al Si Ge
Al2GeSi crystallizes in the triclinic P1 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to two equivalent Al(2), two equivalent Ge(1), and one Si(1) atom. There is one shorter (1.92 Å) and one longer (2.69 Å) Al(1)-Al(2) bond length. There is one shorter (2.44 Å) and one longer (2.84 Å) Al(1)-Ge(1) bond length. The Al(1)-Si(1) bond length is 2.76 Å. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to two equivalent Al(1), one Ge(1), and two equivalent Si(1) atoms. The Al(2)-Ge(1) bond length is 2.76 Å. There is one shorter (2.44 Å) and one longer (2.84 Å) Al(2)-Si(1) bond length. Ge(1) is bonded in a distorted single-bond geometry to one Al(2), two equivalent Al(1), and one Si(1) atom. The Ge(1)-Si(1) bond length is 0.48 Å. Si(1) is bonded in a distorted single-bond geometry to one Al(1), two equivalent Al(2), and one Ge(1) atom.