The material structure described by Ta4Co4Si7 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 7-coordinate geometry to four equivalent Co(1), two equivalent Si(2), two equivalent Si(4), and three equivalent Si(3) atoms. In the second Ta site, Ta(2) is bonded in a 7-coordinate geometry to four equivalent Co(1), one Si(1), two equivalent Si(2), two equivalent Si(3), and two equivalent Si(4) atoms. Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Si(1), two equivalent Si(3), and two equivalent Si(4) atoms to form a mixture of distorted edge, face, and corner-sharing CoTa4Co2Si6 cuboctahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to one Ta(2), four equivalent Co(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to four equivalent Ta(1), four equivalent Ta(2), and two equivalent Si(2) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Ta(2), three equivalent Ta(1), and four equivalent Co(1) atoms. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to two equivalent Ta(1), two equivalent Ta(2), and four equivalent Co(1) atoms. is represented by the CIF file [CIF]
data_Ta4Co4Si7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.215
_cell_length_b   9.215
_cell_length_c   9.215
_cell_angle_alpha   94.187
_cell_angle_beta   94.187
_cell_angle_gamma   148.648
_symmetry_Int_Tables_number   1
_cell_volume   391.970
_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
  Ta  Ta0  1  0.134  0.134  0.267  1.0
  Ta  Ta1  1  0.866  0.866  0.733  1.0
  Ta  Ta2  1  0.866  0.134  0.000  1.0
  Ta  Ta3  1  0.134  0.866  0.000  1.0
  Ta  Ta4  1  0.500  0.310  0.810  1.0
  Ta  Ta5  1  0.500  0.690  0.190  1.0
  Ta  Ta6  1  0.690  0.500  0.190  1.0
  Ta  Ta7  1  0.310  0.500  0.810  1.0
  Co  Co8  1  0.399  0.899  0.797  1.0
  Co  Co9  1  0.101  0.601  0.203  1.0
  Co  Co10  1  0.101  0.899  0.500  1.0
  Co  Co11  1  0.399  0.601  0.500  1.0
  Co  Co12  1  0.601  0.399  0.500  1.0
  Co  Co13  1  0.899  0.101  0.500  1.0
  Co  Co14  1  0.899  0.399  0.797  1.0
  Co  Co15  1  0.601  0.101  0.203  1.0
  Si  Si16  1  0.500  0.095  0.595  1.0
  Si  Si17  1  0.500  0.905  0.405  1.0
  Si  Si18  1  0.905  0.500  0.405  1.0
  Si  Si19  1  0.095  0.500  0.595  1.0
  Si  Si20  1  0.751  0.751  0.000  1.0
  Si  Si21  1  0.249  0.249  0.000  1.0
  Si  Si22  1  0.291  0.291  0.582  1.0
  Si  Si23  1  0.709  0.709  0.418  1.0
  Si  Si24  1  0.709  0.291  0.000  1.0
  Si  Si25  1  0.291  0.709  0.000  1.0
  Si  Si26  1  0.000  0.296  0.296  1.0
  Si  Si27  1  0.000  0.704  0.704  1.0
  Si  Si28  1  0.704  0.000  0.704  1.0
  Si  Si29  1  0.296  0.000  0.296  1.0
[/CIF]
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The material structure described by Ta4Co4Si7 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 7-coordinate geometry to four equivalent Co(1), two equivalent Si(2), two equivalent Si(4), and three equivalent Si(3) atoms. In the second Ta site, Ta(2) is bonded in a 7-coordinate geometry to four equivalent Co(1), one Si(1), two equivalent Si(2), two equivalent Si(3), and two equivalent Si(4) atoms. Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Si(1), two equivalent Si(3), and two equivalent Si(4) atoms to form a mixture of distorted edge, face, and corner-sharing CoTa4Co2Si6 cuboctahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to one Ta(2), four equivalent Co(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to four equivalent Ta(1), four equivalent Ta(2), and two equivalent Si(2) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Ta(2), three equivalent Ta(1), and four equivalent Co(1) atoms. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to two equivalent Ta(1), two equivalent Ta(2), and four equivalent Co(1) atoms. is represented by the CIF file [CIF]
data_Ta4Co4Si7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.215
_cell_length_b   9.215
_cell_length_c   9.215
_cell_angle_alpha   94.187
_cell_angle_beta   94.187
_cell_angle_gamma   148.648
_symmetry_Int_Tables_number   1
_cell_volume   391.970
_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
  Ta  Ta0  1  0.134  0.134  0.267  1.0
  Ta  Ta1  1  0.866  0.866  0.733  1.0
  Ta  Ta2  1  0.866  0.134  0.000  1.0
  Ta  Ta3  1  0.134  0.866  0.000  1.0
  Ta  Ta4  1  0.500  0.310  0.810  1.0
  Ta  Ta5  1  0.500  0.690  0.190  1.0
  Ta  Ta6  1  0.690  0.500  0.190  1.0
  Ta  Ta7  1  0.310  0.500  0.810  1.0
  Co  Co8  1  0.399  0.899  0.797  1.0
  Co  Co9  1  0.101  0.601  0.203  1.0
  Co  Co10  1  0.101  0.899  0.500  1.0
  Co  Co11  1  0.399  0.601  0.500  1.0
  Co  Co12  1  0.601  0.399  0.500  1.0
  Co  Co13  1  0.899  0.101  0.500  1.0
  Co  Co14  1  0.899  0.399  0.797  1.0
  Co  Co15  1  0.601  0.101  0.203  1.0
  Si  Si16  1  0.500  0.095  0.595  1.0
  Si  Si17  1  0.500  0.905  0.405  1.0
  Si  Si18  1  0.905  0.500  0.405  1.0
  Si  Si19  1  0.095  0.500  0.595  1.0
  Si  Si20  1  0.751  0.751  0.000  1.0
  Si  Si21  1  0.249  0.249  0.000  1.0
  Si  Si22  1  0.291  0.291  0.582  1.0
  Si  Si23  1  0.709  0.709  0.418  1.0
  Si  Si24  1  0.709  0.291  0.000  1.0
  Si  Si25  1  0.291  0.709  0.000  1.0
  Si  Si26  1  0.000  0.296  0.296  1.0
  Si  Si27  1  0.000  0.704  0.704  1.0
  Si  Si28  1  0.704  0.000  0.704  1.0
  Si  Si29  1  0.296  0.000  0.296  1.0
[/CIF]
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