The compound described by ErCo9Si2 crystallizes in the tetragonal I4_1/amd space group. Er(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 Er(1), eight equivalent Co(2), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded in a 12-coordinate geometry to two equivalent Er(1), one Co(1), seven equivalent Co(2), and two equivalent Si(1) atoms. Si(1) is bonded in a 10-coordinate geometry to two equivalent Co(1) and eight equivalent Co(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_ErCo9Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.257
_cell_length_b   7.505
_cell_length_c   7.505
_cell_angle_alpha   79.993
_cell_angle_beta   65.364
_cell_angle_gamma   65.364
_symmetry_Int_Tables_number   1
_cell_volume   291.239
_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
  Er  Er0  1  0.375  0.250  0.750  1.0
  Er  Er1  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  0.559  0.579  0.668  1.0
  Co  Co5  1  0.559  0.168  0.079  1.0
  Co  Co6  1  0.137  0.421  0.168  1.0
  Co  Co7  1  0.137  0.668  0.921  1.0
  Co  Co8  1  0.806  0.332  0.421  1.0
  Co  Co9  1  0.806  0.921  0.832  1.0
  Co  Co10  1  0.727  0.832  0.579  1.0
  Co  Co11  1  0.727  0.079  0.332  1.0
  Co  Co12  1  0.441  0.421  0.332  1.0
  Co  Co13  1  0.441  0.832  0.921  1.0
  Co  Co14  1  0.863  0.579  0.832  1.0
  Co  Co15  1  0.863  0.332  0.079  1.0
  Co  Co16  1  0.194  0.668  0.579  1.0
  Co  Co17  1  0.194  0.079  0.168  1.0
  Co  Co18  1  0.273  0.168  0.421  1.0
  Co  Co19  1  0.273  0.921  0.668  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 compound described by ErCo9Si2 crystallizes in the tetragonal I4_1/amd space group. Er(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 Er(1), eight equivalent Co(2), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded in a 12-coordinate geometry to two equivalent Er(1), one Co(1), seven equivalent Co(2), and two equivalent Si(1) atoms. Si(1) is bonded in a 10-coordinate geometry to two equivalent Co(1) and eight equivalent Co(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_ErCo9Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.257
_cell_length_b   7.505
_cell_length_c   7.505
_cell_angle_alpha   79.993
_cell_angle_beta   65.364
_cell_angle_gamma   65.364
_symmetry_Int_Tables_number   1
_cell_volume   291.239
_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
  Er  Er0  1  0.375  0.250  0.750  1.0
  Er  Er1  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  0.559  0.579  0.668  1.0
  Co  Co5  1  0.559  0.168  0.079  1.0
  Co  Co6  1  0.137  0.421  0.168  1.0
  Co  Co7  1  0.137  0.668  0.921  1.0
  Co  Co8  1  0.806  0.332  0.421  1.0
  Co  Co9  1  0.806  0.921  0.832  1.0
  Co  Co10  1  0.727  0.832  0.579  1.0
  Co  Co11  1  0.727  0.079  0.332  1.0
  Co  Co12  1  0.441  0.421  0.332  1.0
  Co  Co13  1  0.441  0.832  0.921  1.0
  Co  Co14  1  0.863  0.579  0.832  1.0
  Co  Co15  1  0.863  0.332  0.079  1.0
  Co  Co16  1  0.194  0.668  0.579  1.0
  Co  Co17  1  0.194  0.079  0.168  1.0
  Co  Co18  1  0.273  0.168  0.421  1.0
  Co  Co19  1  0.273  0.921  0.668  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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