The structure described by Al9Co2 crystallizes in the monoclinic P2_1/c space group. Co(1) is bonded in a 9-coordinate geometry to one Al(1), two equivalent Al(2), two equivalent Al(3), two equivalent Al(4), and two equivalent Al(5) atoms. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted linear geometry to two equivalent Co(1) atoms. In the second Al site, Al(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Co(1) atoms. In the third Al site, Al(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Co(1) atoms. In the fourth Al site, Al(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Co(1) atoms. In the fifth Al site, Al(5) is bonded in a 2-coordinate geometry to two equivalent Co(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al9Co2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.141
_cell_length_b   6.229
_cell_length_c   8.456
_cell_angle_alpha   89.999
_cell_angle_beta   95.182
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   322.132
_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
  Al  Al0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.500  0.500  1.0
  Al  Al2  1  0.593  0.037  0.733  1.0
  Al  Al3  1  0.407  0.537  0.767  1.0
  Al  Al4  1  0.407  0.963  0.267  1.0
  Al  Al5  1  0.593  0.463  0.233  1.0
  Al  Al6  1  0.912  0.711  0.769  1.0
  Al  Al7  1  0.088  0.211  0.730  1.0
  Al  Al8  1  0.088  0.289  0.231  1.0
  Al  Al9  1  0.912  0.789  0.270  1.0
  Al  Al10  1  0.609  0.808  0.003  1.0
  Al  Al11  1  0.391  0.308  0.497  1.0
  Al  Al12  1  0.391  0.192  0.997  1.0
  Al  Al13  1  0.609  0.692  0.503  1.0
  Al  Al14  1  0.785  0.386  0.957  1.0
  Al  Al15  1  0.215  0.886  0.543  1.0
  Al  Al16  1  0.215  0.614  0.043  1.0
  Al  Al17  1  0.785  0.114  0.457  1.0
  Co  Co18  1  0.736  0.383  0.667  1.0
  Co  Co19  1  0.264  0.883  0.833  1.0
  Co  Co20  1  0.264  0.617  0.333  1.0
  Co  Co21  1  0.736  0.117  0.167  1.0
[/CIF]
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The structure described by Al9Co2 crystallizes in the monoclinic P2_1/c space group. Co(1) is bonded in a 9-coordinate geometry to one Al(1), two equivalent Al(2), two equivalent Al(3), two equivalent Al(4), and two equivalent Al(5) atoms. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted linear geometry to two equivalent Co(1) atoms. In the second Al site, Al(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Co(1) atoms. In the third Al site, Al(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Co(1) atoms. In the fourth Al site, Al(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Co(1) atoms. In the fifth Al site, Al(5) is bonded in a 2-coordinate geometry to two equivalent Co(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al9Co2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.141
_cell_length_b   6.229
_cell_length_c   8.456
_cell_angle_alpha   89.999
_cell_angle_beta   95.182
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   322.132
_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
  Al  Al0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.500  0.500  1.0
  Al  Al2  1  0.593  0.037  0.733  1.0
  Al  Al3  1  0.407  0.537  0.767  1.0
  Al  Al4  1  0.407  0.963  0.267  1.0
  Al  Al5  1  0.593  0.463  0.233  1.0
  Al  Al6  1  0.912  0.711  0.769  1.0
  Al  Al7  1  0.088  0.211  0.730  1.0
  Al  Al8  1  0.088  0.289  0.231  1.0
  Al  Al9  1  0.912  0.789  0.270  1.0
  Al  Al10  1  0.609  0.808  0.003  1.0
  Al  Al11  1  0.391  0.308  0.497  1.0
  Al  Al12  1  0.391  0.192  0.997  1.0
  Al  Al13  1  0.609  0.692  0.503  1.0
  Al  Al14  1  0.785  0.386  0.957  1.0
  Al  Al15  1  0.215  0.886  0.543  1.0
  Al  Al16  1  0.215  0.614  0.043  1.0
  Al  Al17  1  0.785  0.114  0.457  1.0
  Co  Co18  1  0.736  0.383  0.667  1.0
  Co  Co19  1  0.264  0.883  0.833  1.0
  Co  Co20  1  0.264  0.617  0.333  1.0
  Co  Co21  1  0.736  0.117  0.167  1.0
[/CIF]
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