data_TaNb2Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.86
_cell_length_b   4.86
_cell_length_c   4.86
_cell_angle_alpha   127.68
_cell_angle_beta   127.68
_cell_angle_gamma   77.15
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TaNb2Ge
_chemical_formula_sum   'Ta1 Nb2 Ge1'
_cell_volume   69.84
_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
  Ta  Ta3  1  0.0  0.0  0.8  1.0
  Nb  Nb1  1  0.14  0.0  0.9  1.0
  Nb  Nb2  1  0.0  0.14  0.9  1.0
  Ge  Ge0  1  0.0  0.0  0.0  1.0

data_TaNb2Ge
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.06
_cell_length_b   6.06
_cell_length_c   4.86
_cell_angle_alpha   90.0
_cell_angle_beta   128.57
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   TaNb2Ge
_chemical_formula_sum   'Ta2 Nb4 Ge2'
_cell_volume   139.68
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Ta  Ta0  2  0.0  0.0  0.8  1.0
  Nb  Nb1  4  0.43  0.43  0.76  1.0
  Ge  Ge2  2  0.0  0.0  0.0  1.0

Ta Nb Nb Ge
Ta Nb Nb Ge 0 2 o o o 0 1 o o o 0 3 o o + 1 3 o o + 2 3 o o + 
TaNb2Ge is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two TaNb2Ge clusters. Ta(1) is bonded in a distorted water-like geometry to two equivalent Nb(1) and one Ge(1) atom. Both Ta(1)-Nb(1) bond lengths are 0.55 Å. The Ta(1)-Ge(1) bond length is 0.97 Å. Nb(1) is bonded in a distorted single-bond geometry to one Ta(1) and one Ge(1) atom. The Nb(1)-Ge(1) bond length is 1.06 Å. Ge(1) is bonded in a 3-coordinate geometry to one Ta(1) and two equivalent Nb(1) atoms.