The structure described by Ta5Si3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. In the second Ta site, Ta(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Ta(2) and five equivalent Ta(1) atoms. is represented by the CIF file [CIF]
data_Ta5Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.529
_cell_length_b   7.529
_cell_length_c   5.280
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   259.217
_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  0.000  0.754  0.750  1.0
  Ta  Ta1  1  0.000  0.246  0.250  1.0
  Ta  Ta2  1  0.754  0.754  0.250  1.0
  Ta  Ta3  1  0.754  0.000  0.750  1.0
  Ta  Ta4  1  0.246  0.246  0.750  1.0
  Ta  Ta5  1  0.246  0.000  0.250  1.0
  Ta  Ta6  1  0.333  0.667  0.500  1.0
  Ta  Ta7  1  0.667  0.333  0.000  1.0
  Ta  Ta8  1  0.667  0.333  0.500  1.0
  Ta  Ta9  1  0.333  0.667  0.000  1.0
  Si  Si10  1  0.395  0.000  0.750  1.0
  Si  Si11  1  0.395  0.395  0.250  1.0
  Si  Si12  1  0.000  0.605  0.250  1.0
  Si  Si13  1  0.000  0.395  0.750  1.0
  Si  Si14  1  0.605  0.605  0.750  1.0
  Si  Si15  1  0.605  0.000  0.250  1.0
[/CIF]
.
The structure described by Ta5Si3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. In the second Ta site, Ta(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Ta(2) and five equivalent Ta(1) atoms. is represented by the CIF file [CIF]
data_Ta5Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.529
_cell_length_b   7.529
_cell_length_c   5.280
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   259.217
_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  0.000  0.754  0.750  1.0
  Ta  Ta1  1  0.000  0.246  0.250  1.0
  Ta  Ta2  1  0.754  0.754  0.250  1.0
  Ta  Ta3  1  0.754  0.000  0.750  1.0
  Ta  Ta4  1  0.246  0.246  0.750  1.0
  Ta  Ta5  1  0.246  0.000  0.250  1.0
  Ta  Ta6  1  0.333  0.667  0.500  1.0
  Ta  Ta7  1  0.667  0.333  0.000  1.0
  Ta  Ta8  1  0.667  0.333  0.500  1.0
  Ta  Ta9  1  0.333  0.667  0.000  1.0
  Si  Si10  1  0.395  0.000  0.750  1.0
  Si  Si11  1  0.395  0.395  0.250  1.0
  Si  Si12  1  0.000  0.605  0.250  1.0
  Si  Si13  1  0.000  0.395  0.750  1.0
  Si  Si14  1  0.605  0.605  0.750  1.0
  Si  Si15  1  0.605  0.000  0.250  1.0
[/CIF]
.