data_K2TaTl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.18
_cell_length_b   4.65
_cell_length_c   10.06
_cell_angle_alpha   90.0
_cell_angle_beta   94.24
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2TaTl
_chemical_formula_sum   'K2 Ta1 Tl1'
_cell_volume   148.42
_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
  K  K0  1  0.38  0.0  0.35  1.0
  K  K1  1  0.47  0.32  0.14  1.0
  Ta  Ta2  1  0.74  0.0  0.9  1.0
  Tl  Tl3  1  0.1  0.32  0.7  1.0

data_K2TaTl
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.18
_cell_length_b   4.65
_cell_length_c   10.06
_cell_angle_alpha   90.0
_cell_angle_beta   94.24
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2TaTl
_chemical_formula_sum   'K2 Ta1 Tl1'
_cell_volume   148.42
_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
  K  K0  1  0.38  0.0  0.35  1.0
  K  K1  1  0.47  0.32  0.14  1.0
  Ta  Ta2  1  0.74  0.0  0.9  1.0
  Tl  Tl3  1  0.1  0.32  0.7  1.0

K K Ta Tl
K2TaTl crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to two equivalent K(1), two equivalent K(2), and one Tl(1) atom. Both K(1)-K(1) bond lengths are 3.18 Å. There is one shorter (2.62 Å) and one longer (3.81 Å) K(1)-K(2) bond length. The K(1)-Tl(1) bond length is 3.94 Å. In the second K site, K(2) is bonded in a 1-coordinate geometry to two equivalent K(1) and three equivalent Ta(1) atoms. There are a spread of K(2)-Ta(1) bond distances ranging from 3.04-4.10 Å. Ta(1) is bonded in a 7-coordinate geometry to three equivalent K(2), two equivalent Ta(1), and two equivalent Tl(1) atoms. Both Ta(1)-Ta(1) bond lengths are 3.18 Å. There is one shorter (2.86 Å) and one longer (3.18 Å) Ta(1)-Tl(1) bond length. Tl(1) is bonded in a 5-coordinate geometry to one K(1), two equivalent Ta(1), and two equivalent Tl(1) atoms. Both Tl(1)-Tl(1) bond lengths are 3.18 Å.