The material described by LaCo8Si5 crystallizes in the tetragonal I4/mcm space group. La(1) is bonded in a 24-coordinate geometry to eight equivalent Co(1), eight equivalent Co(2), and eight equivalent Si(1) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to two equivalent La(1), two equivalent Co(2), three equivalent Co(1), one Si(2), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded to two equivalent La(1), two equivalent Co(1), three equivalent Co(2), one Si(2), and four equivalent Si(1) atoms to form distorted CoLa2Co5Si5 cuboctahedra that share  a cornercorner with one Si(2)Co8Si4 cuboctahedra, corners with eleven equivalent Co(2)La2Co5Si5 cuboctahedra, faces with two equivalent Si(2)Co8Si4 cuboctahedra, and faces with seven equivalent Co(2)La2Co5Si5 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 11-coordinate geometry to two equivalent La(1), four equivalent Co(1), four equivalent Co(2), and one Si(2) atom. In the second Si site, Si(2) is bonded to four equivalent Co(1), four equivalent Co(2), and four equivalent Si(1) atoms to form SiCo8Si4 cuboctahedra that share corners with four equivalent Co(2)La2Co5Si5 cuboctahedra and faces with eight equivalent Co(2)La2Co5Si5 cuboctahedra. is represented by the CIF file [CIF]
data_LaCo8Si5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.973
_cell_length_b   7.973
_cell_length_c   7.973
_cell_angle_alpha   121.499
_cell_angle_beta   121.499
_cell_angle_gamma   87.422
_symmetry_Int_Tables_number   1
_cell_volume   349.940
_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
  La  La0  1  0.250  0.250  0.000  1.0
  La  La1  1  0.750  0.750  0.000  1.0
  Co  Co2  1  0.296  0.796  0.733  1.0
  Co  Co3  1  0.704  0.204  0.267  1.0
  Co  Co4  1  0.062  0.562  0.267  1.0
  Co  Co5  1  0.796  0.062  0.500  1.0
  Co  Co6  1  0.438  0.704  0.500  1.0
  Co  Co7  1  0.938  0.438  0.733  1.0
  Co  Co8  1  0.204  0.938  0.500  1.0
  Co  Co9  1  0.562  0.296  0.500  1.0
  Co  Co10  1  0.211  0.057  0.269  1.0
  Co  Co11  1  0.789  0.943  0.731  1.0
  Co  Co12  1  0.057  0.789  0.846  1.0
  Co  Co13  1  0.711  0.443  0.154  1.0
  Co  Co14  1  0.943  0.211  0.154  1.0
  Co  Co15  1  0.289  0.557  0.846  1.0
  Co  Co16  1  0.557  0.711  0.269  1.0
  Co  Co17  1  0.443  0.289  0.731  1.0
  Si  Si18  1  0.807  0.307  0.865  1.0
  Si  Si19  1  0.193  0.693  0.135  1.0
  Si  Si20  1  0.442  0.942  0.135  1.0
  Si  Si21  1  0.307  0.442  0.500  1.0
  Si  Si22  1  0.058  0.193  0.500  1.0
  Si  Si23  1  0.558  0.058  0.865  1.0
  Si  Si24  1  0.693  0.558  0.500  1.0
  Si  Si25  1  0.942  0.807  0.500  1.0
  Si  Si26  1  0.500  0.000  0.500  1.0
  Si  Si27  1  0.000  0.500  0.500  1.0
[/CIF]
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The material described by LaCo8Si5 crystallizes in the tetragonal I4/mcm space group. La(1) is bonded in a 24-coordinate geometry to eight equivalent Co(1), eight equivalent Co(2), and eight equivalent Si(1) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to two equivalent La(1), two equivalent Co(2), three equivalent Co(1), one Si(2), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded to two equivalent La(1), two equivalent Co(1), three equivalent Co(2), one Si(2), and four equivalent Si(1) atoms to form distorted CoLa2Co5Si5 cuboctahedra that share  a cornercorner with one Si(2)Co8Si4 cuboctahedra, corners with eleven equivalent Co(2)La2Co5Si5 cuboctahedra, faces with two equivalent Si(2)Co8Si4 cuboctahedra, and faces with seven equivalent Co(2)La2Co5Si5 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 11-coordinate geometry to two equivalent La(1), four equivalent Co(1), four equivalent Co(2), and one Si(2) atom. In the second Si site, Si(2) is bonded to four equivalent Co(1), four equivalent Co(2), and four equivalent Si(1) atoms to form SiCo8Si4 cuboctahedra that share corners with four equivalent Co(2)La2Co5Si5 cuboctahedra and faces with eight equivalent Co(2)La2Co5Si5 cuboctahedra. is represented by the CIF file [CIF]
data_LaCo8Si5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.973
_cell_length_b   7.973
_cell_length_c   7.973
_cell_angle_alpha   121.499
_cell_angle_beta   121.499
_cell_angle_gamma   87.422
_symmetry_Int_Tables_number   1
_cell_volume   349.940
_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
  La  La0  1  0.250  0.250  0.000  1.0
  La  La1  1  0.750  0.750  0.000  1.0
  Co  Co2  1  0.296  0.796  0.733  1.0
  Co  Co3  1  0.704  0.204  0.267  1.0
  Co  Co4  1  0.062  0.562  0.267  1.0
  Co  Co5  1  0.796  0.062  0.500  1.0
  Co  Co6  1  0.438  0.704  0.500  1.0
  Co  Co7  1  0.938  0.438  0.733  1.0
  Co  Co8  1  0.204  0.938  0.500  1.0
  Co  Co9  1  0.562  0.296  0.500  1.0
  Co  Co10  1  0.211  0.057  0.269  1.0
  Co  Co11  1  0.789  0.943  0.731  1.0
  Co  Co12  1  0.057  0.789  0.846  1.0
  Co  Co13  1  0.711  0.443  0.154  1.0
  Co  Co14  1  0.943  0.211  0.154  1.0
  Co  Co15  1  0.289  0.557  0.846  1.0
  Co  Co16  1  0.557  0.711  0.269  1.0
  Co  Co17  1  0.443  0.289  0.731  1.0
  Si  Si18  1  0.807  0.307  0.865  1.0
  Si  Si19  1  0.193  0.693  0.135  1.0
  Si  Si20  1  0.442  0.942  0.135  1.0
  Si  Si21  1  0.307  0.442  0.500  1.0
  Si  Si22  1  0.058  0.193  0.500  1.0
  Si  Si23  1  0.558  0.058  0.865  1.0
  Si  Si24  1  0.693  0.558  0.500  1.0
  Si  Si25  1  0.942  0.807  0.500  1.0
  Si  Si26  1  0.500  0.000  0.500  1.0
  Si  Si27  1  0.000  0.500  0.500  1.0
[/CIF]
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