data_Ta4NbPt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.4
_cell_length_b   5.4
_cell_length_c   5.4
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta4NbPt
_chemical_formula_sum   'Ta4 Nb1 Pt1'
_cell_volume   111.14
_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
  Ta  Ta2  1  0.78  0.85  0.78  1.0
  Ta  Ta3  1  0.85  0.78  0.78  1.0
  Ta  Ta4  1  0.85  0.85  0.85  1.0
  Ta  Ta5  1  0.78  0.78  0.85  1.0
  Nb  Nb0  1  0.0  0.0  0.0  1.0
  Pt  Pt1  1  0.72  0.72  0.72  1.0

data_Ta4NbPt
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.4
_cell_length_b   5.4
_cell_length_c   13.22
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Ta4NbPt
_chemical_formula_sum   'Ta12 Nb3 Pt3'
_cell_volume   333.43
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  9  0.02  0.05  0.2  1.0
  Ta  Ta1  3  0.0  0.0  0.15  1.0
  Nb  Nb2  3  0.0  0.0  0.0  1.0
  Pt  Pt3  3  0.0  0.0  0.28  1.0

Ta Ta Ta Ta Nb Pt
Ta4NbPt crystallizes in the trigonal R3m space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 2-coordinate geometry to one Ta(2), two equivalent Ta(1), and one Pt(1) atom. The Ta(1)-Ta(2) bond length is 0.68 Å. Both Ta(1)-Ta(1) bond lengths are 0.39 Å. The Ta(1)-Pt(1) bond length is 1.08 Å. In the second Ta site, Ta(2) is bonded in a 4-coordinate geometry to three equivalent Ta(1) and one Nb(1) atom. The Ta(2)-Nb(1) bond length is 1.95 Å. Nb(1) is bonded to one Ta(2) and three equivalent Pt(1) atoms to form distorted corner-sharing NbTaPt3 tetrahedra. All Nb(1)-Pt(1) bond lengths are 3.21 Å. Pt(1) is bonded in a 6-coordinate geometry to three equivalent Ta(1) and three equivalent Nb(1) atoms.