The structure described by Hf4Co4Ge7 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 7-coordinate geometry to two equivalent Ge(3), two equivalent Ge(4), and three equivalent Ge(1) atoms. In the second Hf site, Hf(2) is bonded to one Ge(2), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms to form distorted HfGe7 pentagonal bipyramids that share corners with eight equivalent Co(1)Ge6 cuboctahedra, corners with two equivalent Hf(2)Ge7 pentagonal bipyramids,  an edgeedge with one Hf(2)Ge7 pentagonal bipyramid, faces with four equivalent Co(1)Ge6 cuboctahedra, and faces with two equivalent Hf(2)Ge7 pentagonal bipyramids. Co(1) is bonded to two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms to form distorted CoGe6 cuboctahedra that share corners with six equivalent Co(1)Ge6 cuboctahedra, corners with four equivalent Hf(2)Ge7 pentagonal bipyramids, edges with three equivalent Co(1)Ge6 cuboctahedra, faces with two equivalent Co(1)Ge6 cuboctahedra, and faces with two equivalent Hf(2)Ge7 pentagonal bipyramids. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Hf(2), three equivalent Hf(1), and four equivalent Co(1) atoms. In the second Ge site, Ge(2) is bonded in a 6-coordinate geometry to one Hf(2), four equivalent Co(1), and one Ge(2) atom. In the third Ge site, Ge(3) is bonded in a 8-coordinate geometry to two equivalent Hf(1), two equivalent Hf(2), and four equivalent Co(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 10-coordinate geometry to four equivalent Hf(1), four equivalent Hf(2), and two equivalent Ge(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Hf4Co4Ge7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.599
_cell_length_b   9.599
_cell_length_c   9.599
_cell_angle_alpha   94.145
_cell_angle_beta   94.145
_cell_angle_gamma   148.809
_symmetry_Int_Tables_number   1
_cell_volume   441.199
_cell_formula_units_Z   2
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
  Hf  Hf0  1  0.139  0.139  0.278  1.0
  Hf  Hf1  1  0.861  0.861  0.722  1.0
  Hf  Hf2  1  0.139  0.861  0.000  1.0
  Hf  Hf3  1  0.861  0.139  0.000  1.0
  Hf  Hf4  1  0.304  0.500  0.804  1.0
  Hf  Hf5  1  0.696  0.500  0.196  1.0
  Hf  Hf6  1  0.500  0.696  0.196  1.0
  Hf  Hf7  1  0.500  0.304  0.804  1.0
  Co  Co8  1  0.601  0.399  0.500  1.0
  Co  Co9  1  0.899  0.101  0.500  1.0
  Co  Co10  1  0.101  0.601  0.203  1.0
  Co  Co11  1  0.399  0.899  0.797  1.0
  Co  Co12  1  0.601  0.101  0.203  1.0
  Co  Co13  1  0.899  0.399  0.797  1.0
  Co  Co14  1  0.101  0.899  0.500  1.0
  Co  Co15  1  0.399  0.601  0.500  1.0
  Ge  Ge16  1  0.293  0.293  0.586  1.0
  Ge  Ge17  1  0.707  0.707  0.414  1.0
  Ge  Ge18  1  0.293  0.707  0.000  1.0
  Ge  Ge19  1  0.707  0.293  0.000  1.0
  Ge  Ge20  1  0.094  0.500  0.594  1.0
  Ge  Ge21  1  0.906  0.500  0.406  1.0
  Ge  Ge22  1  0.500  0.906  0.406  1.0
  Ge  Ge23  1  0.500  0.094  0.594  1.0
  Ge  Ge24  1  0.292  1.000  0.292  1.0
  Ge  Ge25  1  0.708  0.000  0.708  1.0
  Ge  Ge26  1  0.000  0.708  0.708  1.0
  Ge  Ge27  1  1.000  0.292  0.292  1.0
  Ge  Ge28  1  0.249  0.249  1.000  1.0
  Ge  Ge29  1  0.751  0.751  0.000  1.0
[/CIF]
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The structure described by Hf4Co4Ge7 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 7-coordinate geometry to two equivalent Ge(3), two equivalent Ge(4), and three equivalent Ge(1) atoms. In the second Hf site, Hf(2) is bonded to one Ge(2), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms to form distorted HfGe7 pentagonal bipyramids that share corners with eight equivalent Co(1)Ge6 cuboctahedra, corners with two equivalent Hf(2)Ge7 pentagonal bipyramids,  an edgeedge with one Hf(2)Ge7 pentagonal bipyramid, faces with four equivalent Co(1)Ge6 cuboctahedra, and faces with two equivalent Hf(2)Ge7 pentagonal bipyramids. Co(1) is bonded to two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms to form distorted CoGe6 cuboctahedra that share corners with six equivalent Co(1)Ge6 cuboctahedra, corners with four equivalent Hf(2)Ge7 pentagonal bipyramids, edges with three equivalent Co(1)Ge6 cuboctahedra, faces with two equivalent Co(1)Ge6 cuboctahedra, and faces with two equivalent Hf(2)Ge7 pentagonal bipyramids. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Hf(2), three equivalent Hf(1), and four equivalent Co(1) atoms. In the second Ge site, Ge(2) is bonded in a 6-coordinate geometry to one Hf(2), four equivalent Co(1), and one Ge(2) atom. In the third Ge site, Ge(3) is bonded in a 8-coordinate geometry to two equivalent Hf(1), two equivalent Hf(2), and four equivalent Co(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 10-coordinate geometry to four equivalent Hf(1), four equivalent Hf(2), and two equivalent Ge(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Hf4Co4Ge7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.599
_cell_length_b   9.599
_cell_length_c   9.599
_cell_angle_alpha   94.145
_cell_angle_beta   94.145
_cell_angle_gamma   148.809
_symmetry_Int_Tables_number   1
_cell_volume   441.199
_cell_formula_units_Z   2
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
  Hf  Hf0  1  0.139  0.139  0.278  1.0
  Hf  Hf1  1  0.861  0.861  0.722  1.0
  Hf  Hf2  1  0.139  0.861  0.000  1.0
  Hf  Hf3  1  0.861  0.139  0.000  1.0
  Hf  Hf4  1  0.304  0.500  0.804  1.0
  Hf  Hf5  1  0.696  0.500  0.196  1.0
  Hf  Hf6  1  0.500  0.696  0.196  1.0
  Hf  Hf7  1  0.500  0.304  0.804  1.0
  Co  Co8  1  0.601  0.399  0.500  1.0
  Co  Co9  1  0.899  0.101  0.500  1.0
  Co  Co10  1  0.101  0.601  0.203  1.0
  Co  Co11  1  0.399  0.899  0.797  1.0
  Co  Co12  1  0.601  0.101  0.203  1.0
  Co  Co13  1  0.899  0.399  0.797  1.0
  Co  Co14  1  0.101  0.899  0.500  1.0
  Co  Co15  1  0.399  0.601  0.500  1.0
  Ge  Ge16  1  0.293  0.293  0.586  1.0
  Ge  Ge17  1  0.707  0.707  0.414  1.0
  Ge  Ge18  1  0.293  0.707  0.000  1.0
  Ge  Ge19  1  0.707  0.293  0.000  1.0
  Ge  Ge20  1  0.094  0.500  0.594  1.0
  Ge  Ge21  1  0.906  0.500  0.406  1.0
  Ge  Ge22  1  0.500  0.906  0.406  1.0
  Ge  Ge23  1  0.500  0.094  0.594  1.0
  Ge  Ge24  1  0.292  1.000  0.292  1.0
  Ge  Ge25  1  0.708  0.000  0.708  1.0
  Ge  Ge26  1  0.000  0.708  0.708  1.0
  Ge  Ge27  1  1.000  0.292  0.292  1.0
  Ge  Ge28  1  0.249  0.249  1.000  1.0
  Ge  Ge29  1  0.751  0.751  0.000  1.0
[/CIF]
.