The material described by Co5B16 crystallizes in the orthorhombic Pmma space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to one B(1), one B(2), one B(5), one B(6), two equivalent B(3), two equivalent B(4), two equivalent B(7), and two equivalent B(9) atoms. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to one B(4), one B(7), one B(9), two equivalent B(1), two equivalent B(2), and two equivalent B(6) atoms. In the third Co site, Co(3) is bonded to two equivalent B(5), two equivalent B(6), four equivalent B(8), and four equivalent B(9) atoms to form distorted face-sharing CoB12 cuboctahedra. There are nine inequivalent B sites. In the first B site, B(8) is bonded in a 7-coordinate geometry to two equivalent Co(3), one B(9), two equivalent B(3), and two equivalent B(5) atoms. In the second B site, B(9) is bonded in a 9-coordinate geometry to one Co(2), two equivalent Co(1), two equivalent Co(3), one B(3), one B(8), and two equivalent B(6) atoms. In the third B site, B(1) is bonded in a 8-coordinate geometry to two equivalent Co(1), four equivalent Co(2), and two equivalent B(4) atoms. In the fourth B site, B(2) is bonded in a 7-coordinate geometry to one Co(1), two equivalent Co(2), one B(5), one B(6), and two equivalent B(7) atoms. In the fifth B site, B(3) is bonded in a 7-coordinate geometry to two equivalent Co(1), one B(9), two equivalent B(5), and two equivalent B(8) atoms. In the sixth B site, B(4) is bonded in a 10-coordinate geometry to two equivalent Co(2), four equivalent Co(1), two equivalent B(1), and two equivalent B(7) atoms. In the seventh B site, B(5) is bonded in a 8-coordinate geometry to one Co(1), one Co(3), one B(2), one B(6), two equivalent B(3), and two equivalent B(8) atoms. In the eighth B site, B(6) is bonded in a 8-coordinate geometry to one Co(1), one Co(3), two equivalent Co(2), one B(2), one B(5), and two equivalent B(9) atoms. In the ninth B site, B(7) is bonded in a 7-coordinate geometry to one Co(2), two equivalent Co(1), one B(4), one B(7), and two equivalent B(2) atoms. is represented by the CIF file [CIF]
data_Co5B16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.924
_cell_length_b   5.465
_cell_length_c   19.052
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   304.441
_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
  Co  Co0  1  0.000  0.571  0.347  1.0
  Co  Co1  1  0.000  0.429  0.653  1.0
  Co  Co2  1  0.000  0.571  0.153  1.0
  Co  Co3  1  0.000  0.429  0.847  1.0
  Co  Co4  1  0.500  0.951  0.317  1.0
  Co  Co5  1  0.500  0.049  0.683  1.0
  Co  Co6  1  0.500  0.951  0.183  1.0
  Co  Co7  1  0.500  0.049  0.817  1.0
  Co  Co8  1  0.000  0.000  0.500  1.0
  Co  Co9  1  0.000  0.000  0.000  1.0
  B  B10  1  0.000  0.780  0.250  1.0
  B  B11  1  0.000  0.220  0.750  1.0
  B  B12  1  0.000  0.211  0.339  1.0
  B  B13  1  0.000  0.789  0.661  1.0
  B  B14  1  0.000  0.211  0.161  1.0
  B  B15  1  0.000  0.789  0.839  1.0
  B  B16  1  0.500  0.506  0.430  1.0
  B  B17  1  0.500  0.494  0.570  1.0
  B  B18  1  0.500  0.506  0.070  1.0
  B  B19  1  0.500  0.494  0.930  1.0
  B  B20  1  0.500  0.607  0.250  1.0
  B  B21  1  0.500  0.393  0.750  1.0
  B  B22  1  0.000  0.306  0.432  1.0
  B  B23  1  0.000  0.694  0.568  1.0
  B  B24  1  0.000  0.306  0.068  1.0
  B  B25  1  0.000  0.694  0.932  1.0
  B  B26  1  0.000  0.983  0.395  1.0
  B  B27  1  0.000  0.017  0.605  1.0
  B  B28  1  0.000  0.983  0.105  1.0
  B  B29  1  0.000  0.017  0.895  1.0
  B  B30  1  0.500  0.330  0.297  1.0
  B  B31  1  0.500  0.670  0.703  1.0
  B  B32  1  0.500  0.330  0.203  1.0
  B  B33  1  0.500  0.670  0.797  1.0
  B  B34  1  0.500  0.291  0.491  1.0
  B  B35  1  0.500  0.709  0.509  1.0
  B  B36  1  0.500  0.291  0.009  1.0
  B  B37  1  0.500  0.709  0.991  1.0
  B  B38  1  0.500  0.821  0.423  1.0
  B  B39  1  0.500  0.179  0.577  1.0
  B  B40  1  0.500  0.821  0.077  1.0
  B  B41  1  0.500  0.179  0.923  1.0
[/CIF]
.
The material described by Co5B16 crystallizes in the orthorhombic Pmma space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to one B(1), one B(2), one B(5), one B(6), two equivalent B(3), two equivalent B(4), two equivalent B(7), and two equivalent B(9) atoms. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to one B(4), one B(7), one B(9), two equivalent B(1), two equivalent B(2), and two equivalent B(6) atoms. In the third Co site, Co(3) is bonded to two equivalent B(5), two equivalent B(6), four equivalent B(8), and four equivalent B(9) atoms to form distorted face-sharing CoB12 cuboctahedra. There are nine inequivalent B sites. In the first B site, B(8) is bonded in a 7-coordinate geometry to two equivalent Co(3), one B(9), two equivalent B(3), and two equivalent B(5) atoms. In the second B site, B(9) is bonded in a 9-coordinate geometry to one Co(2), two equivalent Co(1), two equivalent Co(3), one B(3), one B(8), and two equivalent B(6) atoms. In the third B site, B(1) is bonded in a 8-coordinate geometry to two equivalent Co(1), four equivalent Co(2), and two equivalent B(4) atoms. In the fourth B site, B(2) is bonded in a 7-coordinate geometry to one Co(1), two equivalent Co(2), one B(5), one B(6), and two equivalent B(7) atoms. In the fifth B site, B(3) is bonded in a 7-coordinate geometry to two equivalent Co(1), one B(9), two equivalent B(5), and two equivalent B(8) atoms. In the sixth B site, B(4) is bonded in a 10-coordinate geometry to two equivalent Co(2), four equivalent Co(1), two equivalent B(1), and two equivalent B(7) atoms. In the seventh B site, B(5) is bonded in a 8-coordinate geometry to one Co(1), one Co(3), one B(2), one B(6), two equivalent B(3), and two equivalent B(8) atoms. In the eighth B site, B(6) is bonded in a 8-coordinate geometry to one Co(1), one Co(3), two equivalent Co(2), one B(2), one B(5), and two equivalent B(9) atoms. In the ninth B site, B(7) is bonded in a 7-coordinate geometry to one Co(2), two equivalent Co(1), one B(4), one B(7), and two equivalent B(2) atoms. is represented by the CIF file [CIF]
data_Co5B16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.924
_cell_length_b   5.465
_cell_length_c   19.052
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   304.441
_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
  Co  Co0  1  0.000  0.571  0.347  1.0
  Co  Co1  1  0.000  0.429  0.653  1.0
  Co  Co2  1  0.000  0.571  0.153  1.0
  Co  Co3  1  0.000  0.429  0.847  1.0
  Co  Co4  1  0.500  0.951  0.317  1.0
  Co  Co5  1  0.500  0.049  0.683  1.0
  Co  Co6  1  0.500  0.951  0.183  1.0
  Co  Co7  1  0.500  0.049  0.817  1.0
  Co  Co8  1  0.000  0.000  0.500  1.0
  Co  Co9  1  0.000  0.000  0.000  1.0
  B  B10  1  0.000  0.780  0.250  1.0
  B  B11  1  0.000  0.220  0.750  1.0
  B  B12  1  0.000  0.211  0.339  1.0
  B  B13  1  0.000  0.789  0.661  1.0
  B  B14  1  0.000  0.211  0.161  1.0
  B  B15  1  0.000  0.789  0.839  1.0
  B  B16  1  0.500  0.506  0.430  1.0
  B  B17  1  0.500  0.494  0.570  1.0
  B  B18  1  0.500  0.506  0.070  1.0
  B  B19  1  0.500  0.494  0.930  1.0
  B  B20  1  0.500  0.607  0.250  1.0
  B  B21  1  0.500  0.393  0.750  1.0
  B  B22  1  0.000  0.306  0.432  1.0
  B  B23  1  0.000  0.694  0.568  1.0
  B  B24  1  0.000  0.306  0.068  1.0
  B  B25  1  0.000  0.694  0.932  1.0
  B  B26  1  0.000  0.983  0.395  1.0
  B  B27  1  0.000  0.017  0.605  1.0
  B  B28  1  0.000  0.983  0.105  1.0
  B  B29  1  0.000  0.017  0.895  1.0
  B  B30  1  0.500  0.330  0.297  1.0
  B  B31  1  0.500  0.670  0.703  1.0
  B  B32  1  0.500  0.330  0.203  1.0
  B  B33  1  0.500  0.670  0.797  1.0
  B  B34  1  0.500  0.291  0.491  1.0
  B  B35  1  0.500  0.709  0.509  1.0
  B  B36  1  0.500  0.291  0.009  1.0
  B  B37  1  0.500  0.709  0.991  1.0
  B  B38  1  0.500  0.821  0.423  1.0
  B  B39  1  0.500  0.179  0.577  1.0
  B  B40  1  0.500  0.821  0.077  1.0
  B  B41  1  0.500  0.179  0.923  1.0
[/CIF]
.