The structure described by Co7Nb6 is Frank-Kasper $\mu$ Phase structured and crystallizes in the trigonal R-3m space group. There are three inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 15-coordinate geometry to three equivalent Nb(1), six equivalent Nb(3), and six equivalent Co(2) atoms. In the second Nb site, Nb(2) is bonded in a 16-coordinate geometry to one Nb(3), three equivalent Nb(2), three equivalent Co(1), and nine equivalent Co(2) atoms. In the third Nb site, Nb(3) is bonded in a 14-coordinate geometry to one Nb(2), one Nb(3), six equivalent Nb(1), and six equivalent Co(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to six equivalent Nb(2) and six equivalent Co(2) atoms to form CoNb6Co6 cuboctahedra that share corners with twelve equivalent Co(2)Nb7Co5 cuboctahedra, edges with six equivalent Co(1)Nb6Co6 cuboctahedra, and faces with eighteen equivalent Co(2)Nb7Co5 cuboctahedra. In the second Co site, Co(2) is bonded to two equivalent Nb(1), two equivalent Nb(3), three equivalent Nb(2), one Co(1), and four equivalent Co(2) atoms to form CoNb7Co5 cuboctahedra that share corners with two equivalent Co(1)Nb6Co6 cuboctahedra, corners with thirteen equivalent Co(2)Nb7Co5 cuboctahedra, edges with five equivalent Co(2)Nb7Co5 cuboctahedra, faces with three equivalent Co(1)Nb6Co6 cuboctahedra, and faces with ten equivalent Co(2)Nb7Co5 cuboctahedra. is represented by the CIF card [CIF]
data_Nb6Co7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.172
_cell_length_b   9.172
_cell_length_c   9.172
_cell_angle_alpha   30.969
_cell_angle_beta   30.969
_cell_angle_gamma   30.969
_symmetry_Int_Tables_number   1
_cell_volume   181.264
_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  0.835  0.835  0.835  1.0
  Nb  Nb1  1  0.165  0.165  0.165  1.0
  Nb  Nb2  1  0.656  0.656  0.656  1.0
  Nb  Nb3  1  0.344  0.344  0.344  1.0
  Nb  Nb4  1  0.551  0.551  0.551  1.0
  Nb  Nb5  1  0.449  0.449  0.449  1.0
  Co  Co6  1  0.000  0.000  0.000  1.0
  Co  Co7  1  0.911  0.406  0.911  1.0
  Co  Co8  1  0.911  0.911  0.406  1.0
  Co  Co9  1  0.406  0.911  0.911  1.0
  Co  Co10  1  0.089  0.594  0.089  1.0
  Co  Co11  1  0.089  0.089  0.594  1.0
  Co  Co12  1  0.594  0.089  0.089  1.0
[/CIF]
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The structure described by Co7Nb6 is Frank-Kasper $\mu$ Phase structured and crystallizes in the trigonal R-3m space group. There are three inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 15-coordinate geometry to three equivalent Nb(1), six equivalent Nb(3), and six equivalent Co(2) atoms. In the second Nb site, Nb(2) is bonded in a 16-coordinate geometry to one Nb(3), three equivalent Nb(2), three equivalent Co(1), and nine equivalent Co(2) atoms. In the third Nb site, Nb(3) is bonded in a 14-coordinate geometry to one Nb(2), one Nb(3), six equivalent Nb(1), and six equivalent Co(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to six equivalent Nb(2) and six equivalent Co(2) atoms to form CoNb6Co6 cuboctahedra that share corners with twelve equivalent Co(2)Nb7Co5 cuboctahedra, edges with six equivalent Co(1)Nb6Co6 cuboctahedra, and faces with eighteen equivalent Co(2)Nb7Co5 cuboctahedra. In the second Co site, Co(2) is bonded to two equivalent Nb(1), two equivalent Nb(3), three equivalent Nb(2), one Co(1), and four equivalent Co(2) atoms to form CoNb7Co5 cuboctahedra that share corners with two equivalent Co(1)Nb6Co6 cuboctahedra, corners with thirteen equivalent Co(2)Nb7Co5 cuboctahedra, edges with five equivalent Co(2)Nb7Co5 cuboctahedra, faces with three equivalent Co(1)Nb6Co6 cuboctahedra, and faces with ten equivalent Co(2)Nb7Co5 cuboctahedra. is represented by the CIF card [CIF]
data_Nb6Co7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.172
_cell_length_b   9.172
_cell_length_c   9.172
_cell_angle_alpha   30.969
_cell_angle_beta   30.969
_cell_angle_gamma   30.969
_symmetry_Int_Tables_number   1
_cell_volume   181.264
_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  0.835  0.835  0.835  1.0
  Nb  Nb1  1  0.165  0.165  0.165  1.0
  Nb  Nb2  1  0.656  0.656  0.656  1.0
  Nb  Nb3  1  0.344  0.344  0.344  1.0
  Nb  Nb4  1  0.551  0.551  0.551  1.0
  Nb  Nb5  1  0.449  0.449  0.449  1.0
  Co  Co6  1  0.000  0.000  0.000  1.0
  Co  Co7  1  0.911  0.406  0.911  1.0
  Co  Co8  1  0.911  0.911  0.406  1.0
  Co  Co9  1  0.406  0.911  0.911  1.0
  Co  Co10  1  0.089  0.594  0.089  1.0
  Co  Co11  1  0.089  0.089  0.594  1.0
  Co  Co12  1  0.594  0.089  0.089  1.0
[/CIF]
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