The material described by CsCaTa6Cl18 crystallizes in the trigonal P-31c space group. Cs(1) is bonded in a 12-coordinate geometry to six equivalent Cl(1) and six equivalent Cl(2) atoms. Ca(1) is bonded to six equivalent Cl(1) atoms to form CaCl6 octahedra that share corners with six equivalent Ta(1)Cl5 square pyramids. Ta(1) is bonded to one Cl(1), two equivalent Cl(2), and two equivalent Cl(3) atoms to form distorted TaCl5 square pyramids that share  a cornercorner with one Ca(1)Cl6 octahedra and corners with four equivalent Ta(1)Cl5 square pyramids. The corner-sharing octahedral tilt angles are 45°. There are three inequivalent Cl sites. In the first Cl site, Cl(3) is bonded in a 2-coordinate geometry to two equivalent Ta(1) atoms. In the second Cl site, Cl(1) is bonded in a 2-coordinate geometry to one Cs(1), one Ca(1), and one Ta(1) atom. In the third Cl site, Cl(2) is bonded in a 2-coordinate geometry to one Cs(1) and two equivalent Ta(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CsCaTa6Cl18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.430
_cell_length_b   9.430
_cell_length_c   17.581
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   1353.857
_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
  Cs  Cs0  1  0.333  0.667  0.750  1.0
  Cs  Cs1  1  0.667  0.333  0.250  1.0
  Ca  Ca2  1  0.667  0.333  0.750  1.0
  Ca  Ca3  1  0.333  0.667  0.250  1.0
  Ta  Ta4  1  0.842  0.038  0.568  1.0
  Ta  Ta5  1  0.158  0.962  0.432  1.0
  Ta  Ta6  1  0.962  0.804  0.568  1.0
  Ta  Ta7  1  0.842  0.804  0.932  1.0
  Ta  Ta8  1  0.038  0.196  0.432  1.0
  Ta  Ta9  1  0.158  0.196  0.068  1.0
  Ta  Ta10  1  0.196  0.158  0.568  1.0
  Ta  Ta11  1  0.962  0.158  0.932  1.0
  Ta  Ta12  1  0.804  0.842  0.432  1.0
  Ta  Ta13  1  0.038  0.842  0.068  1.0
  Ta  Ta14  1  0.196  0.038  0.932  1.0
  Ta  Ta15  1  0.804  0.962  0.068  1.0
  Cl  Cl16  1  0.641  0.078  0.657  1.0
  Cl  Cl17  1  0.359  0.922  0.343  1.0
  Cl  Cl18  1  0.922  0.563  0.657  1.0
  Cl  Cl19  1  0.641  0.563  0.843  1.0
  Cl  Cl20  1  0.078  0.437  0.343  1.0
  Cl  Cl21  1  0.359  0.437  0.157  1.0
  Cl  Cl22  1  0.437  0.359  0.657  1.0
  Cl  Cl23  1  0.922  0.359  0.843  1.0
  Cl  Cl24  1  0.563  0.641  0.343  1.0
  Cl  Cl25  1  0.078  0.641  0.157  1.0
  Cl  Cl26  1  0.437  0.078  0.843  1.0
  Cl  Cl27  1  0.563  0.922  0.157  1.0
  Cl  Cl28  1  0.044  0.230  0.659  1.0
  Cl  Cl29  1  0.956  0.770  0.341  1.0
  Cl  Cl30  1  0.770  0.814  0.659  1.0
  Cl  Cl31  1  0.044  0.814  0.841  1.0
  Cl  Cl32  1  0.230  0.186  0.341  1.0
  Cl  Cl33  1  0.956  0.186  0.159  1.0
  Cl  Cl34  1  0.186  0.956  0.659  1.0
  Cl  Cl35  1  0.770  0.956  0.841  1.0
  Cl  Cl36  1  0.814  0.044  0.341  1.0
  Cl  Cl37  1  0.230  0.044  0.159  1.0
  Cl  Cl38  1  0.186  0.230  0.841  1.0
  Cl  Cl39  1  0.814  0.770  0.159  1.0
  Cl  Cl40  1  0.273  0.413  0.500  1.0
  Cl  Cl41  1  0.727  0.587  0.500  1.0
  Cl  Cl42  1  0.587  0.860  0.500  1.0
  Cl  Cl43  1  0.273  0.860  1.000  1.0
  Cl  Cl44  1  0.413  0.140  0.500  1.0
  Cl  Cl45  1  0.727  0.140  0.000  1.0
  Cl  Cl46  1  0.140  0.727  0.500  1.0
  Cl  Cl47  1  0.587  0.727  1.000  1.0
  Cl  Cl48  1  0.860  0.273  0.500  1.0
  Cl  Cl49  1  0.413  0.273  0.000  1.0
  Cl  Cl50  1  0.140  0.413  1.000  1.0
  Cl  Cl51  1  0.860  0.587  0.000  1.0
[/CIF]
.
The material described by CsCaTa6Cl18 crystallizes in the trigonal P-31c space group. Cs(1) is bonded in a 12-coordinate geometry to six equivalent Cl(1) and six equivalent Cl(2) atoms. Ca(1) is bonded to six equivalent Cl(1) atoms to form CaCl6 octahedra that share corners with six equivalent Ta(1)Cl5 square pyramids. Ta(1) is bonded to one Cl(1), two equivalent Cl(2), and two equivalent Cl(3) atoms to form distorted TaCl5 square pyramids that share  a cornercorner with one Ca(1)Cl6 octahedra and corners with four equivalent Ta(1)Cl5 square pyramids. The corner-sharing octahedral tilt angles are 45°. There are three inequivalent Cl sites. In the first Cl site, Cl(3) is bonded in a 2-coordinate geometry to two equivalent Ta(1) atoms. In the second Cl site, Cl(1) is bonded in a 2-coordinate geometry to one Cs(1), one Ca(1), and one Ta(1) atom. In the third Cl site, Cl(2) is bonded in a 2-coordinate geometry to one Cs(1) and two equivalent Ta(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CsCaTa6Cl18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.430
_cell_length_b   9.430
_cell_length_c   17.581
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   1353.857
_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
  Cs  Cs0  1  0.333  0.667  0.750  1.0
  Cs  Cs1  1  0.667  0.333  0.250  1.0
  Ca  Ca2  1  0.667  0.333  0.750  1.0
  Ca  Ca3  1  0.333  0.667  0.250  1.0
  Ta  Ta4  1  0.842  0.038  0.568  1.0
  Ta  Ta5  1  0.158  0.962  0.432  1.0
  Ta  Ta6  1  0.962  0.804  0.568  1.0
  Ta  Ta7  1  0.842  0.804  0.932  1.0
  Ta  Ta8  1  0.038  0.196  0.432  1.0
  Ta  Ta9  1  0.158  0.196  0.068  1.0
  Ta  Ta10  1  0.196  0.158  0.568  1.0
  Ta  Ta11  1  0.962  0.158  0.932  1.0
  Ta  Ta12  1  0.804  0.842  0.432  1.0
  Ta  Ta13  1  0.038  0.842  0.068  1.0
  Ta  Ta14  1  0.196  0.038  0.932  1.0
  Ta  Ta15  1  0.804  0.962  0.068  1.0
  Cl  Cl16  1  0.641  0.078  0.657  1.0
  Cl  Cl17  1  0.359  0.922  0.343  1.0
  Cl  Cl18  1  0.922  0.563  0.657  1.0
  Cl  Cl19  1  0.641  0.563  0.843  1.0
  Cl  Cl20  1  0.078  0.437  0.343  1.0
  Cl  Cl21  1  0.359  0.437  0.157  1.0
  Cl  Cl22  1  0.437  0.359  0.657  1.0
  Cl  Cl23  1  0.922  0.359  0.843  1.0
  Cl  Cl24  1  0.563  0.641  0.343  1.0
  Cl  Cl25  1  0.078  0.641  0.157  1.0
  Cl  Cl26  1  0.437  0.078  0.843  1.0
  Cl  Cl27  1  0.563  0.922  0.157  1.0
  Cl  Cl28  1  0.044  0.230  0.659  1.0
  Cl  Cl29  1  0.956  0.770  0.341  1.0
  Cl  Cl30  1  0.770  0.814  0.659  1.0
  Cl  Cl31  1  0.044  0.814  0.841  1.0
  Cl  Cl32  1  0.230  0.186  0.341  1.0
  Cl  Cl33  1  0.956  0.186  0.159  1.0
  Cl  Cl34  1  0.186  0.956  0.659  1.0
  Cl  Cl35  1  0.770  0.956  0.841  1.0
  Cl  Cl36  1  0.814  0.044  0.341  1.0
  Cl  Cl37  1  0.230  0.044  0.159  1.0
  Cl  Cl38  1  0.186  0.230  0.841  1.0
  Cl  Cl39  1  0.814  0.770  0.159  1.0
  Cl  Cl40  1  0.273  0.413  0.500  1.0
  Cl  Cl41  1  0.727  0.587  0.500  1.0
  Cl  Cl42  1  0.587  0.860  0.500  1.0
  Cl  Cl43  1  0.273  0.860  1.000  1.0
  Cl  Cl44  1  0.413  0.140  0.500  1.0
  Cl  Cl45  1  0.727  0.140  0.000  1.0
  Cl  Cl46  1  0.140  0.727  0.500  1.0
  Cl  Cl47  1  0.587  0.727  1.000  1.0
  Cl  Cl48  1  0.860  0.273  0.500  1.0
  Cl  Cl49  1  0.413  0.273  0.000  1.0
  Cl  Cl50  1  0.140  0.413  1.000  1.0
  Cl  Cl51  1  0.860  0.587  0.000  1.0
[/CIF]
.