The material described by EuCo9Si2 crystallizes in the tetragonal I4_1/amd space group. Eu(1) is bonded in a 18-coordinate geometry to two equivalent Co(1) and sixteen equivalent Co(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to two equivalent Eu(1), eight equivalent Co(2), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded to two equivalent Eu(1), one Co(1), seven equivalent Co(2), and two equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing CoEu2Co8Si2 cuboctahedra. Si(1) is bonded in a 10-coordinate geometry to two equivalent Co(1) and eight equivalent Co(2) atoms. is represented by the CIF file [CIF]
data_EuCo9Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.319
_cell_length_b   7.579
_cell_length_c   7.579
_cell_angle_alpha   79.992
_cell_angle_beta   65.363
_cell_angle_gamma   65.363
_symmetry_Int_Tables_number   1
_cell_volume   299.897
_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
  Eu  Eu0  1  0.375  0.250  0.750  1.0
  Eu  Eu1  1  0.625  0.750  0.250  1.0
  Co  Co2  1  0.125  0.750  0.250  1.0
  Co  Co3  1  0.875  0.250  0.750  1.0
  Co  Co4  1  0.561  0.580  0.669  1.0
  Co  Co5  1  0.561  0.169  0.080  1.0
  Co  Co6  1  0.141  0.420  0.169  1.0
  Co  Co7  1  0.141  0.669  0.920  1.0
  Co  Co8  1  0.810  0.331  0.420  1.0
  Co  Co9  1  0.810  0.920  0.831  1.0
  Co  Co10  1  0.730  0.831  0.580  1.0
  Co  Co11  1  0.730  0.080  0.331  1.0
  Co  Co12  1  0.439  0.420  0.331  1.0
  Co  Co13  1  0.439  0.831  0.920  1.0
  Co  Co14  1  0.859  0.580  0.831  1.0
  Co  Co15  1  0.859  0.331  0.080  1.0
  Co  Co16  1  0.190  0.669  0.580  1.0
  Co  Co17  1  0.190  0.080  0.169  1.0
  Co  Co18  1  0.270  0.169  0.420  1.0
  Co  Co19  1  0.270  0.920  0.669  1.0
  Si  Si20  1  0.500  0.500  0.000  1.0
  Si  Si21  1  0.000  0.500  0.500  1.0
  Si  Si22  1  0.000  0.000  0.000  1.0
  Si  Si23  1  0.000  0.000  0.500  1.0
[/CIF]
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The material described by EuCo9Si2 crystallizes in the tetragonal I4_1/amd space group. Eu(1) is bonded in a 18-coordinate geometry to two equivalent Co(1) and sixteen equivalent Co(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to two equivalent Eu(1), eight equivalent Co(2), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded to two equivalent Eu(1), one Co(1), seven equivalent Co(2), and two equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing CoEu2Co8Si2 cuboctahedra. Si(1) is bonded in a 10-coordinate geometry to two equivalent Co(1) and eight equivalent Co(2) atoms. is represented by the CIF file [CIF]
data_EuCo9Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.319
_cell_length_b   7.579
_cell_length_c   7.579
_cell_angle_alpha   79.992
_cell_angle_beta   65.363
_cell_angle_gamma   65.363
_symmetry_Int_Tables_number   1
_cell_volume   299.897
_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
  Eu  Eu0  1  0.375  0.250  0.750  1.0
  Eu  Eu1  1  0.625  0.750  0.250  1.0
  Co  Co2  1  0.125  0.750  0.250  1.0
  Co  Co3  1  0.875  0.250  0.750  1.0
  Co  Co4  1  0.561  0.580  0.669  1.0
  Co  Co5  1  0.561  0.169  0.080  1.0
  Co  Co6  1  0.141  0.420  0.169  1.0
  Co  Co7  1  0.141  0.669  0.920  1.0
  Co  Co8  1  0.810  0.331  0.420  1.0
  Co  Co9  1  0.810  0.920  0.831  1.0
  Co  Co10  1  0.730  0.831  0.580  1.0
  Co  Co11  1  0.730  0.080  0.331  1.0
  Co  Co12  1  0.439  0.420  0.331  1.0
  Co  Co13  1  0.439  0.831  0.920  1.0
  Co  Co14  1  0.859  0.580  0.831  1.0
  Co  Co15  1  0.859  0.331  0.080  1.0
  Co  Co16  1  0.190  0.669  0.580  1.0
  Co  Co17  1  0.190  0.080  0.169  1.0
  Co  Co18  1  0.270  0.169  0.420  1.0
  Co  Co19  1  0.270  0.920  0.669  1.0
  Si  Si20  1  0.500  0.500  0.000  1.0
  Si  Si21  1  0.000  0.500  0.500  1.0
  Si  Si22  1  0.000  0.000  0.000  1.0
  Si  Si23  1  0.000  0.000  0.500  1.0
[/CIF]
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