The compound described by Ge3Cu is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Cu(1) is bonded to four equivalent Ge(2) and eight equivalent Ge(1) atoms to form CuGe12 cuboctahedra that share corners with four equivalent Cu(1)Ge12 cuboctahedra, corners with eight equivalent Ge(2)Cu4Ge8 cuboctahedra, edges with eight equivalent Cu(1)Ge12 cuboctahedra, edges with sixteen equivalent Ge(1)Cu4Ge8 cuboctahedra, faces with four equivalent Cu(1)Ge12 cuboctahedra, faces with six equivalent Ge(2)Cu4Ge8 cuboctahedra, and faces with eight equivalent Ge(1)Cu4Ge8 cuboctahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent Cu(1), four equivalent Ge(1), and four equivalent Ge(2) atoms to form GeCu4Ge8 cuboctahedra that share corners with twelve equivalent Ge(1)Cu4Ge8 cuboctahedra, edges with eight equivalent Cu(1)Ge12 cuboctahedra, edges with eight equivalent Ge(1)Cu4Ge8 cuboctahedra, edges with eight equivalent Ge(2)Cu4Ge8 cuboctahedra, faces with four equivalent Cu(1)Ge12 cuboctahedra, faces with four equivalent Ge(2)Cu4Ge8 cuboctahedra, and faces with ten equivalent Ge(1)Cu4Ge8 cuboctahedra. In the second Ge site, Ge(2) is bonded to four equivalent Cu(1) and eight equivalent Ge(1) atoms to form distorted GeCu4Ge8 cuboctahedra that share corners with four equivalent Ge(2)Cu4Ge8 cuboctahedra, corners with eight equivalent Cu(1)Ge12 cuboctahedra, edges with eight equivalent Ge(2)Cu4Ge8 cuboctahedra, edges with sixteen equivalent Ge(1)Cu4Ge8 cuboctahedra, faces with four equivalent Ge(2)Cu4Ge8 cuboctahedra, faces with six equivalent Cu(1)Ge12 cuboctahedra, and faces with eight equivalent Ge(1)Cu4Ge8 cuboctahedra. is represented by the CIF card [CIF]
data_CuGe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.190
_cell_length_b   5.190
_cell_length_c   5.190
_cell_angle_alpha   134.690
_cell_angle_beta   134.690
_cell_angle_gamma   66.013
_symmetry_Int_Tables_number   1
_cell_volume   69.570
_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  0.000  0.000  0.000  1.0
  Ge  Ge1  1  0.750  0.250  0.500  1.0
  Ge  Ge2  1  0.250  0.750  0.500  1.0
  Ge  Ge3  1  0.500  0.500  0.000  1.0
[/CIF]
.
The compound described by Ge3Cu is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Cu(1) is bonded to four equivalent Ge(2) and eight equivalent Ge(1) atoms to form CuGe12 cuboctahedra that share corners with four equivalent Cu(1)Ge12 cuboctahedra, corners with eight equivalent Ge(2)Cu4Ge8 cuboctahedra, edges with eight equivalent Cu(1)Ge12 cuboctahedra, edges with sixteen equivalent Ge(1)Cu4Ge8 cuboctahedra, faces with four equivalent Cu(1)Ge12 cuboctahedra, faces with six equivalent Ge(2)Cu4Ge8 cuboctahedra, and faces with eight equivalent Ge(1)Cu4Ge8 cuboctahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent Cu(1), four equivalent Ge(1), and four equivalent Ge(2) atoms to form GeCu4Ge8 cuboctahedra that share corners with twelve equivalent Ge(1)Cu4Ge8 cuboctahedra, edges with eight equivalent Cu(1)Ge12 cuboctahedra, edges with eight equivalent Ge(1)Cu4Ge8 cuboctahedra, edges with eight equivalent Ge(2)Cu4Ge8 cuboctahedra, faces with four equivalent Cu(1)Ge12 cuboctahedra, faces with four equivalent Ge(2)Cu4Ge8 cuboctahedra, and faces with ten equivalent Ge(1)Cu4Ge8 cuboctahedra. In the second Ge site, Ge(2) is bonded to four equivalent Cu(1) and eight equivalent Ge(1) atoms to form distorted GeCu4Ge8 cuboctahedra that share corners with four equivalent Ge(2)Cu4Ge8 cuboctahedra, corners with eight equivalent Cu(1)Ge12 cuboctahedra, edges with eight equivalent Ge(2)Cu4Ge8 cuboctahedra, edges with sixteen equivalent Ge(1)Cu4Ge8 cuboctahedra, faces with four equivalent Ge(2)Cu4Ge8 cuboctahedra, faces with six equivalent Cu(1)Ge12 cuboctahedra, and faces with eight equivalent Ge(1)Cu4Ge8 cuboctahedra. is represented by the CIF card [CIF]
data_CuGe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.190
_cell_length_b   5.190
_cell_length_c   5.190
_cell_angle_alpha   134.690
_cell_angle_beta   134.690
_cell_angle_gamma   66.013
_symmetry_Int_Tables_number   1
_cell_volume   69.570
_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  0.000  0.000  0.000  1.0
  Ge  Ge1  1  0.750  0.250  0.500  1.0
  Ge  Ge2  1  0.250  0.750  0.500  1.0
  Ge  Ge3  1  0.500  0.500  0.000  1.0
[/CIF]
.