data_BaTa2Tc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.98
_cell_length_b   4.98
_cell_length_c   3.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaTa2Tc
_chemical_formula_sum   'Ba1 Ta2 Tc1'
_cell_volume   79.86
_cell_formula_units_Z   1
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
  Ba  Ba0  1  0.49  0.49  0.0  1.0
  Ta  Ta1  1  0.49  0.0  0.61  1.0
  Ta  Ta2  1  0.0  0.49  0.61  1.0
  Tc  Tc3  1  0.0  0.0  0.0  1.0

data_BaTa2Tc
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.05
_cell_length_b   7.05
_cell_length_c   3.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   BaTa2Tc
_chemical_formula_sum   'Ba2 Ta4 Tc2'
_cell_volume   159.71
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Ba  Ba0  2  0.49  0.0  0.0  1.0
  Ta  Ta1  4  0.25  0.25  0.61  1.0
  Tc  Tc2  2  0.0  0.0  0.0  1.0

Ba Ta Ta Tc
BaTa2Tc is beta Np-derived structured and crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 8-coordinate geometry to eight equivalent Ta(1) atoms. There are a spread of Ba(1)-Ta(1) bond distances ranging from 2.76-3.20 Å. Ta(1) is bonded in a 8-coordinate geometry to four equivalent Ba(1) and four equivalent Tc(1) atoms. There are a spread of Ta(1)-Tc(1) bond distances ranging from 2.76-3.20 Å. Tc(1) is bonded in a 8-coordinate geometry to eight equivalent Ta(1) atoms.