The crystal structure described by Ir3Ge7 crystallizes in the cubic Im-3m space group. Ir(1) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 4-coordinate geometry to four equivalent Ir(1) atoms. In the second Ge site, Ge(2) is bonded to three equivalent Ir(1) and one Ge(2) atom to form a mixture of distorted corner and edge-sharing GeGeIr3 tetrahedra. is represented by the CIF file [CIF]
data_Ge7Ir3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.542
_cell_length_b   7.542
_cell_length_c   7.542
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   330.199
_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
  Ge  Ge0  1  0.500  0.750  0.250  1.0
  Ge  Ge1  1  0.750  0.500  0.250  1.0
  Ge  Ge2  1  0.250  0.500  0.750  1.0
  Ge  Ge3  1  0.750  0.250  0.500  1.0
  Ge  Ge4  1  0.250  0.750  0.500  1.0
  Ge  Ge5  1  0.500  0.250  0.750  1.0
  Ge  Ge6  1  0.335  0.335  0.335  1.0
  Ge  Ge7  1  0.335  0.000  0.000  1.0
  Ge  Ge8  1  0.000  0.335  0.000  1.0
  Ge  Ge9  1  0.000  0.000  0.335  1.0
  Ge  Ge10  1  0.000  0.665  0.000  1.0
  Ge  Ge11  1  0.000  0.000  0.665  1.0
  Ge  Ge12  1  0.665  0.000  0.000  1.0
  Ge  Ge13  1  0.665  0.665  0.665  1.0
  Ir  Ir14  1  0.000  0.340  0.340  1.0
  Ir  Ir15  1  0.340  0.000  0.340  1.0
  Ir  Ir16  1  0.660  0.000  0.660  1.0
  Ir  Ir17  1  0.660  0.660  0.000  1.0
  Ir  Ir18  1  0.340  0.340  0.000  1.0
  Ir  Ir19  1  0.000  0.660  0.660  1.0
[/CIF]
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The crystal structure described by Ir3Ge7 crystallizes in the cubic Im-3m space group. Ir(1) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 4-coordinate geometry to four equivalent Ir(1) atoms. In the second Ge site, Ge(2) is bonded to three equivalent Ir(1) and one Ge(2) atom to form a mixture of distorted corner and edge-sharing GeGeIr3 tetrahedra. is represented by the CIF file [CIF]
data_Ge7Ir3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.542
_cell_length_b   7.542
_cell_length_c   7.542
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   330.199
_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
  Ge  Ge0  1  0.500  0.750  0.250  1.0
  Ge  Ge1  1  0.750  0.500  0.250  1.0
  Ge  Ge2  1  0.250  0.500  0.750  1.0
  Ge  Ge3  1  0.750  0.250  0.500  1.0
  Ge  Ge4  1  0.250  0.750  0.500  1.0
  Ge  Ge5  1  0.500  0.250  0.750  1.0
  Ge  Ge6  1  0.335  0.335  0.335  1.0
  Ge  Ge7  1  0.335  0.000  0.000  1.0
  Ge  Ge8  1  0.000  0.335  0.000  1.0
  Ge  Ge9  1  0.000  0.000  0.335  1.0
  Ge  Ge10  1  0.000  0.665  0.000  1.0
  Ge  Ge11  1  0.000  0.000  0.665  1.0
  Ge  Ge12  1  0.665  0.000  0.000  1.0
  Ge  Ge13  1  0.665  0.665  0.665  1.0
  Ir  Ir14  1  0.000  0.340  0.340  1.0
  Ir  Ir15  1  0.340  0.000  0.340  1.0
  Ir  Ir16  1  0.660  0.000  0.660  1.0
  Ir  Ir17  1  0.660  0.660  0.000  1.0
  Ir  Ir18  1  0.340  0.340  0.000  1.0
  Ir  Ir19  1  0.000  0.660  0.660  1.0
[/CIF]
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