data_AlCr2Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.54
_cell_length_b   4.54
_cell_length_c   2.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   105.17
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlCr2Ge
_chemical_formula_sum   'Al1 Cr2 Ge1'
_cell_volume   55.31
_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  0.0  0.0  0.0  1.0
  Cr  Cr1  1  0.38  0.8  0.39  1.0
  Cr  Cr2  1  0.38  0.2  0.39  1.0
  Ge  Ge3  1  0.76  0.0  0.0  1.0

data_AlCr2Ge
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.78
_cell_length_b   4.54
_cell_length_c   4.54
_cell_angle_alpha   105.17
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlCr2Ge
_chemical_formula_sum   'Al1 Cr2 Ge1'
_cell_volume   55.31
_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  0.0  0.0  0.0  1.0
  Cr  Cr1  1  0.39  0.38  0.8  1.0
  Cr  Cr2  1  0.39  0.38  0.2  1.0
  Ge  Ge3  1  0.0  0.76  0.0  1.0

Al Cr Cr Ge
Al Cr Cr Ge 0 3 - o o 0 2 o o o 1 2 o + o 1 3 o + o 
Cr2AlGe crystallizes in the triclinic P1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 3-coordinate geometry to two equivalent Cr(2) and two equivalent Ge(1) atoms. There is one shorter (1.79 Å) and one longer (2.76 Å) Cr(1)-Cr(2) bond length. There is one shorter (2.03 Å) and one longer (2.42 Å) Cr(1)-Ge(1) bond length. In the second Cr site, Cr(2) is bonded in a 8-coordinate geometry to two equivalent Cr(1), two equivalent Cr(2), two equivalent Al(1), and two equivalent Ge(1) atoms. Both Cr(2)-Cr(2) bond lengths are 2.78 Å. There is one shorter (2.03 Å) and one longer (2.42 Å) Cr(2)-Al(1) bond length. There is one shorter (2.40 Å) and one longer (2.73 Å) Cr(2)-Ge(1) bond length. Al(1) is bonded in a distorted single-bond geometry to two equivalent Cr(2) and one Ge(1) atom. The Al(1)-Ge(1) bond length is 1.09 Å. Ge(1) is bonded in a 1-coordinate geometry to two equivalent Cr(1), two equivalent Cr(2), and one Al(1) atom.