The compound described by Ta3As crystallizes in the tetragonal P4_2/n space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a distorted bent 150 degrees geometry to two equivalent As(1) atoms. In the second Ta site, Ta(2) is bonded in a distorted see-saw-like geometry to four equivalent As(1) atoms. In the third Ta site, Ta(3) is bonded in a distorted bent 150 degrees geometry to two equivalent As(1) atoms. As(1) is bonded in a 8-coordinate geometry to two equivalent Ta(1), two equivalent Ta(3), and four equivalent Ta(2) atoms. is represented by the CIF card [CIF]
data_Ta3As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.153
_cell_length_b   10.324
_cell_length_c   10.324
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   549.274
_cell_formula_units_Z   8
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  0.266  0.838  0.156  1.0
  Ta  Ta1  1  0.266  0.662  0.344  1.0
  Ta  Ta2  1  0.766  0.656  0.162  1.0
  Ta  Ta3  1  0.766  0.844  0.338  1.0
  Ta  Ta4  1  0.734  0.162  0.844  1.0
  Ta  Ta5  1  0.734  0.338  0.656  1.0
  Ta  Ta6  1  0.234  0.344  0.838  1.0
  Ta  Ta7  1  0.234  0.156  0.662  1.0
  Ta  Ta8  1  0.987  0.258  0.101  1.0
  Ta  Ta9  1  0.987  0.242  0.399  1.0
  Ta  Ta10  1  0.487  0.601  0.742  1.0
  Ta  Ta11  1  0.487  0.899  0.758  1.0
  Ta  Ta12  1  0.013  0.742  0.899  1.0
  Ta  Ta13  1  0.013  0.758  0.601  1.0
  Ta  Ta14  1  0.513  0.399  0.258  1.0
  Ta  Ta15  1  0.513  0.101  0.242  1.0
  Ta  Ta16  1  0.243  0.445  0.541  1.0
  Ta  Ta17  1  0.243  0.055  0.959  1.0
  Ta  Ta18  1  0.743  0.041  0.555  1.0
  Ta  Ta19  1  0.743  0.459  0.945  1.0
  Ta  Ta20  1  0.757  0.555  0.459  1.0
  Ta  Ta21  1  0.757  0.945  0.041  1.0
  Ta  Ta22  1  0.257  0.959  0.445  1.0
  Ta  Ta23  1  0.257  0.541  0.055  1.0
  As  As24  1  0.486  0.265  0.044  1.0
  As  As25  1  0.486  0.235  0.456  1.0
  As  As26  1  0.986  0.544  0.735  1.0
  As  As27  1  0.986  0.956  0.765  1.0
  As  As28  1  0.514  0.735  0.956  1.0
  As  As29  1  0.514  0.765  0.544  1.0
  As  As30  1  0.014  0.456  0.265  1.0
  As  As31  1  0.014  0.044  0.235  1.0
[/CIF]
.
The compound described by Ta3As crystallizes in the tetragonal P4_2/n space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a distorted bent 150 degrees geometry to two equivalent As(1) atoms. In the second Ta site, Ta(2) is bonded in a distorted see-saw-like geometry to four equivalent As(1) atoms. In the third Ta site, Ta(3) is bonded in a distorted bent 150 degrees geometry to two equivalent As(1) atoms. As(1) is bonded in a 8-coordinate geometry to two equivalent Ta(1), two equivalent Ta(3), and four equivalent Ta(2) atoms. is represented by the CIF card [CIF]
data_Ta3As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.153
_cell_length_b   10.324
_cell_length_c   10.324
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   549.274
_cell_formula_units_Z   8
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  0.266  0.838  0.156  1.0
  Ta  Ta1  1  0.266  0.662  0.344  1.0
  Ta  Ta2  1  0.766  0.656  0.162  1.0
  Ta  Ta3  1  0.766  0.844  0.338  1.0
  Ta  Ta4  1  0.734  0.162  0.844  1.0
  Ta  Ta5  1  0.734  0.338  0.656  1.0
  Ta  Ta6  1  0.234  0.344  0.838  1.0
  Ta  Ta7  1  0.234  0.156  0.662  1.0
  Ta  Ta8  1  0.987  0.258  0.101  1.0
  Ta  Ta9  1  0.987  0.242  0.399  1.0
  Ta  Ta10  1  0.487  0.601  0.742  1.0
  Ta  Ta11  1  0.487  0.899  0.758  1.0
  Ta  Ta12  1  0.013  0.742  0.899  1.0
  Ta  Ta13  1  0.013  0.758  0.601  1.0
  Ta  Ta14  1  0.513  0.399  0.258  1.0
  Ta  Ta15  1  0.513  0.101  0.242  1.0
  Ta  Ta16  1  0.243  0.445  0.541  1.0
  Ta  Ta17  1  0.243  0.055  0.959  1.0
  Ta  Ta18  1  0.743  0.041  0.555  1.0
  Ta  Ta19  1  0.743  0.459  0.945  1.0
  Ta  Ta20  1  0.757  0.555  0.459  1.0
  Ta  Ta21  1  0.757  0.945  0.041  1.0
  Ta  Ta22  1  0.257  0.959  0.445  1.0
  Ta  Ta23  1  0.257  0.541  0.055  1.0
  As  As24  1  0.486  0.265  0.044  1.0
  As  As25  1  0.486  0.235  0.456  1.0
  As  As26  1  0.986  0.544  0.735  1.0
  As  As27  1  0.986  0.956  0.765  1.0
  As  As28  1  0.514  0.735  0.956  1.0
  As  As29  1  0.514  0.765  0.544  1.0
  As  As30  1  0.014  0.456  0.265  1.0
  As  As31  1  0.014  0.044  0.235  1.0
[/CIF]
.