The material structure described by Nb7Co6 is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to six equivalent Nb(3) and six equivalent Co(1) atoms. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to six equivalent Co(1) atoms. In the third Nb site, Nb(3) is bonded in a 16-coordinate geometry to one Nb(4), three equivalent Nb(1), three equivalent Nb(3), and nine equivalent Co(1) atoms. In the fourth Nb site, Nb(4) is bonded in a 8-coordinate geometry to one Nb(3), one Nb(4), and six equivalent Co(1) atoms. Co(1) is bonded to one Nb(1), two equivalent Nb(2), two equivalent Nb(4), three equivalent Nb(3), and four equivalent Co(1) atoms to form a mixture of distorted face, edge, and corner-sharing CoNb8Co4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Nb7Co6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.976
_cell_length_b   4.976
_cell_length_c   9.168
_cell_angle_alpha   74.254
_cell_angle_beta   74.254
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   186.700
_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
  Nb  Nb0  1  0.000  0.000  0.000  1.0
  Nb  Nb1  1  0.167  0.167  0.500  1.0
  Nb  Nb2  1  0.833  0.833  0.500  1.0
  Nb  Nb3  1  0.347  0.347  0.958  1.0
  Nb  Nb4  1  0.653  0.653  0.042  1.0
  Nb  Nb5  1  0.450  0.450  0.649  1.0
  Nb  Nb6  1  0.550  0.550  0.351  1.0
  Co  Co7  1  0.579  0.093  0.234  1.0
  Co  Co8  1  0.093  0.093  0.234  1.0
  Co  Co9  1  0.093  0.579  0.234  1.0
  Co  Co10  1  0.421  0.907  0.766  1.0
  Co  Co11  1  0.907  0.907  0.766  1.0
  Co  Co12  1  0.907  0.421  0.766  1.0
[/CIF]
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The material structure described by Nb7Co6 is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to six equivalent Nb(3) and six equivalent Co(1) atoms. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to six equivalent Co(1) atoms. In the third Nb site, Nb(3) is bonded in a 16-coordinate geometry to one Nb(4), three equivalent Nb(1), three equivalent Nb(3), and nine equivalent Co(1) atoms. In the fourth Nb site, Nb(4) is bonded in a 8-coordinate geometry to one Nb(3), one Nb(4), and six equivalent Co(1) atoms. Co(1) is bonded to one Nb(1), two equivalent Nb(2), two equivalent Nb(4), three equivalent Nb(3), and four equivalent Co(1) atoms to form a mixture of distorted face, edge, and corner-sharing CoNb8Co4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Nb7Co6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.976
_cell_length_b   4.976
_cell_length_c   9.168
_cell_angle_alpha   74.254
_cell_angle_beta   74.254
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   186.700
_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
  Nb  Nb0  1  0.000  0.000  0.000  1.0
  Nb  Nb1  1  0.167  0.167  0.500  1.0
  Nb  Nb2  1  0.833  0.833  0.500  1.0
  Nb  Nb3  1  0.347  0.347  0.958  1.0
  Nb  Nb4  1  0.653  0.653  0.042  1.0
  Nb  Nb5  1  0.450  0.450  0.649  1.0
  Nb  Nb6  1  0.550  0.550  0.351  1.0
  Co  Co7  1  0.579  0.093  0.234  1.0
  Co  Co8  1  0.093  0.093  0.234  1.0
  Co  Co9  1  0.093  0.579  0.234  1.0
  Co  Co10  1  0.421  0.907  0.766  1.0
  Co  Co11  1  0.907  0.907  0.766  1.0
  Co  Co12  1  0.907  0.421  0.766  1.0
[/CIF]
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