data_CuGeSb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.55
_cell_length_b   4.55
_cell_length_c   4.55
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CuGeSb
_chemical_formula_sum   'Cu1 Ge1 Sb1'
_cell_volume   66.8
_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
  Cu  Cu0  1  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.61  0.61  0.61  1.0
  Sb  Sb2  1  0.22  0.22  0.22  1.0

data_CuGeSb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.55
_cell_length_b   4.55
_cell_length_c   11.16
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   CuGeSb
_chemical_formula_sum   'Cu3 Ge3 Sb3'
_cell_volume   200.41
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Cu  Cu0  3  0.0  0.0  0.0  1.0
  Ge  Ge1  3  0.0  0.0  0.39  1.0
  Sb  Sb2  3  0.0  0.0  0.78  1.0

Cu Ge Sb
CuGeSb is alpha boron-derived structured and crystallizes in the trigonal R3m space group. Cu(1) is bonded in a 7-coordinate geometry to three equivalent Ge(1) and four equivalent Sb(1) atoms. All Cu(1)-Ge(1) bond lengths are 2.70 Å. There is one shorter (2.46 Å) and three longer (2.92 Å) Cu(1)-Sb(1) bond lengths. Ge(1) is bonded in a hexagonal planar geometry to three equivalent Cu(1) and three equivalent Sb(1) atoms. All Ge(1)-Sb(1) bond lengths are 2.70 Å. Sb(1) is bonded in a 7-coordinate geometry to four equivalent Cu(1) and three equivalent Ge(1) atoms.