The structure described by CoMo is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are seven inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a 16-coordinate geometry to one Mo(3), three equivalent Mo(1), three equivalent Co(3), and nine equivalent Co(2) atoms. In the second Mo site, Mo(2) is bonded in a 16-coordinate geometry to one Mo(4), three equivalent Mo(2), three equivalent Mo(7), and nine equivalent Co(1) atoms. In the third Mo site, Mo(3) is bonded in a 14-coordinate geometry to one Mo(1), one Mo(4), three equivalent Mo(5), three equivalent Mo(6), and six equivalent Co(2) atoms. In the fourth Mo site, Mo(4) is bonded in a 14-coordinate geometry to one Mo(2), one Mo(3), three equivalent Mo(5), three equivalent Mo(6), and six equivalent Co(1) atoms. In the fifth Mo site, Mo(5) is bonded in a 6-coordinate geometry to three equivalent Mo(3), three equivalent Mo(4), three equivalent Co(1), and three equivalent Co(2) atoms. In the sixth Mo site, Mo(6) is bonded in a 6-coordinate geometry to three equivalent Mo(3), three equivalent Mo(4), three equivalent Co(1), and three equivalent Co(2) atoms. In the seventh Mo site, Mo(7) is bonded to six equivalent Mo(2) and six equivalent Co(1) atoms to form distorted MoCo6Mo6 cuboctahedra that share corners with twelve equivalent Co(1)Co4Mo8 cuboctahedra, edges with six equivalent Mo(7)Co6Mo6 cuboctahedra, and faces with eighteen equivalent Co(1)Co4Mo8 cuboctahedra. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one Mo(5), one Mo(6), one Mo(7), two equivalent Mo(4), three equivalent Mo(2), and four equivalent Co(1) atoms to form distorted CoCo4Mo8 cuboctahedra that share corners with two equivalent Mo(7)Co6Mo6 cuboctahedra, corners with four equivalent Co(2)Co5Mo7 cuboctahedra, corners with nine equivalent Co(1)Co4Mo8 cuboctahedra,  an edgeedge with one Co(2)Co5Mo7 cuboctahedra, edges with four equivalent Co(1)Co4Mo8 cuboctahedra, faces with three equivalent Mo(7)Co6Mo6 cuboctahedra, and faces with ten equivalent Co(1)Co4Mo8 cuboctahedra. In the second Co site, Co(2) is bonded to one Mo(5), one Mo(6), two equivalent Mo(3), three equivalent Mo(1), one Co(3), and four equivalent Co(2) atoms to form CoCo5Mo7 cuboctahedra that share corners with two equivalent Co(3)Co6Mo6 cuboctahedra, corners with four equivalent Co(1)Co4Mo8 cuboctahedra, corners with nine equivalent Co(2)Co5Mo7 cuboctahedra,  an edgeedge with one Co(1)Co4Mo8 cuboctahedra, edges with four equivalent Co(2)Co5Mo7 cuboctahedra, faces with three equivalent Co(3)Co6Mo6 cuboctahedra, and faces with ten equivalent Co(2)Co5Mo7 cuboctahedra. In the third Co site, Co(3) is bonded to six equivalent Mo(1) and six equivalent Co(2) atoms to form CoCo6Mo6 cuboctahedra that share corners with twelve equivalent Co(2)Co5Mo7 cuboctahedra, edges with six equivalent Co(3)Co6Mo6 cuboctahedra, and faces with eighteen equivalent Co(2)Co5Mo7 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_CoMo
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.361
_cell_length_b   17.361
_cell_length_c   17.361
_cell_angle_alpha   15.817
_cell_angle_beta   15.817
_cell_angle_gamma   15.817
_symmetry_Int_Tables_number   1
_cell_volume   338.813
_cell_formula_units_Z   13
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
  Co  Co0  1  0.200  0.709  0.709  1.0
  Co  Co1  1  0.704  0.205  0.205  1.0
  Co  Co2  1  0.709  0.200  0.709  1.0
  Co  Co3  1  0.205  0.704  0.205  1.0
  Co  Co4  1  0.709  0.709  0.200  1.0
  Co  Co5  1  0.205  0.205  0.704  1.0
  Co  Co6  1  0.296  0.795  0.795  1.0
  Co  Co7  1  0.800  0.291  0.291  1.0
  Co  Co8  1  0.795  0.296  0.795  1.0
  Co  Co9  1  0.291  0.800  0.291  1.0
  Co  Co10  1  0.795  0.795  0.296  1.0
  Co  Co11  1  0.291  0.291  0.800  1.0
  Co  Co12  1  0.000  0.000  0.000  1.0
  Mo  Mo13  1  0.326  0.326  0.326  1.0
  Mo  Mo14  1  0.826  0.826  0.826  1.0
  Mo  Mo15  1  0.174  0.174  0.174  1.0
  Mo  Mo16  1  0.674  0.674  0.674  1.0
  Mo  Mo17  1  0.275  0.275  0.275  1.0
  Mo  Mo18  1  0.774  0.774  0.774  1.0
  Mo  Mo19  1  0.226  0.226  0.226  1.0
  Mo  Mo20  1  0.725  0.725  0.725  1.0
  Mo  Mo21  1  0.918  0.918  0.918  1.0
  Mo  Mo22  1  0.417  0.417  0.417  1.0
  Mo  Mo23  1  0.583  0.583  0.583  1.0
  Mo  Mo24  1  0.082  0.082  0.082  1.0
  Mo  Mo25  1  0.500  0.500  0.500  1.0
[/CIF]
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The structure described by CoMo is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are seven inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a 16-coordinate geometry to one Mo(3), three equivalent Mo(1), three equivalent Co(3), and nine equivalent Co(2) atoms. In the second Mo site, Mo(2) is bonded in a 16-coordinate geometry to one Mo(4), three equivalent Mo(2), three equivalent Mo(7), and nine equivalent Co(1) atoms. In the third Mo site, Mo(3) is bonded in a 14-coordinate geometry to one Mo(1), one Mo(4), three equivalent Mo(5), three equivalent Mo(6), and six equivalent Co(2) atoms. In the fourth Mo site, Mo(4) is bonded in a 14-coordinate geometry to one Mo(2), one Mo(3), three equivalent Mo(5), three equivalent Mo(6), and six equivalent Co(1) atoms. In the fifth Mo site, Mo(5) is bonded in a 6-coordinate geometry to three equivalent Mo(3), three equivalent Mo(4), three equivalent Co(1), and three equivalent Co(2) atoms. In the sixth Mo site, Mo(6) is bonded in a 6-coordinate geometry to three equivalent Mo(3), three equivalent Mo(4), three equivalent Co(1), and three equivalent Co(2) atoms. In the seventh Mo site, Mo(7) is bonded to six equivalent Mo(2) and six equivalent Co(1) atoms to form distorted MoCo6Mo6 cuboctahedra that share corners with twelve equivalent Co(1)Co4Mo8 cuboctahedra, edges with six equivalent Mo(7)Co6Mo6 cuboctahedra, and faces with eighteen equivalent Co(1)Co4Mo8 cuboctahedra. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one Mo(5), one Mo(6), one Mo(7), two equivalent Mo(4), three equivalent Mo(2), and four equivalent Co(1) atoms to form distorted CoCo4Mo8 cuboctahedra that share corners with two equivalent Mo(7)Co6Mo6 cuboctahedra, corners with four equivalent Co(2)Co5Mo7 cuboctahedra, corners with nine equivalent Co(1)Co4Mo8 cuboctahedra,  an edgeedge with one Co(2)Co5Mo7 cuboctahedra, edges with four equivalent Co(1)Co4Mo8 cuboctahedra, faces with three equivalent Mo(7)Co6Mo6 cuboctahedra, and faces with ten equivalent Co(1)Co4Mo8 cuboctahedra. In the second Co site, Co(2) is bonded to one Mo(5), one Mo(6), two equivalent Mo(3), three equivalent Mo(1), one Co(3), and four equivalent Co(2) atoms to form CoCo5Mo7 cuboctahedra that share corners with two equivalent Co(3)Co6Mo6 cuboctahedra, corners with four equivalent Co(1)Co4Mo8 cuboctahedra, corners with nine equivalent Co(2)Co5Mo7 cuboctahedra,  an edgeedge with one Co(1)Co4Mo8 cuboctahedra, edges with four equivalent Co(2)Co5Mo7 cuboctahedra, faces with three equivalent Co(3)Co6Mo6 cuboctahedra, and faces with ten equivalent Co(2)Co5Mo7 cuboctahedra. In the third Co site, Co(3) is bonded to six equivalent Mo(1) and six equivalent Co(2) atoms to form CoCo6Mo6 cuboctahedra that share corners with twelve equivalent Co(2)Co5Mo7 cuboctahedra, edges with six equivalent Co(3)Co6Mo6 cuboctahedra, and faces with eighteen equivalent Co(2)Co5Mo7 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_CoMo
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.361
_cell_length_b   17.361
_cell_length_c   17.361
_cell_angle_alpha   15.817
_cell_angle_beta   15.817
_cell_angle_gamma   15.817
_symmetry_Int_Tables_number   1
_cell_volume   338.813
_cell_formula_units_Z   13
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
  Co  Co0  1  0.200  0.709  0.709  1.0
  Co  Co1  1  0.704  0.205  0.205  1.0
  Co  Co2  1  0.709  0.200  0.709  1.0
  Co  Co3  1  0.205  0.704  0.205  1.0
  Co  Co4  1  0.709  0.709  0.200  1.0
  Co  Co5  1  0.205  0.205  0.704  1.0
  Co  Co6  1  0.296  0.795  0.795  1.0
  Co  Co7  1  0.800  0.291  0.291  1.0
  Co  Co8  1  0.795  0.296  0.795  1.0
  Co  Co9  1  0.291  0.800  0.291  1.0
  Co  Co10  1  0.795  0.795  0.296  1.0
  Co  Co11  1  0.291  0.291  0.800  1.0
  Co  Co12  1  0.000  0.000  0.000  1.0
  Mo  Mo13  1  0.326  0.326  0.326  1.0
  Mo  Mo14  1  0.826  0.826  0.826  1.0
  Mo  Mo15  1  0.174  0.174  0.174  1.0
  Mo  Mo16  1  0.674  0.674  0.674  1.0
  Mo  Mo17  1  0.275  0.275  0.275  1.0
  Mo  Mo18  1  0.774  0.774  0.774  1.0
  Mo  Mo19  1  0.226  0.226  0.226  1.0
  Mo  Mo20  1  0.725  0.725  0.725  1.0
  Mo  Mo21  1  0.918  0.918  0.918  1.0
  Mo  Mo22  1  0.417  0.417  0.417  1.0
  Mo  Mo23  1  0.583  0.583  0.583  1.0
  Mo  Mo24  1  0.082  0.082  0.082  1.0
  Mo  Mo25  1  0.500  0.500  0.500  1.0
[/CIF]
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