The crystal structure described by Ba2LaTa(CuO4)2 crystallizes in the tetragonal P4/mmm space group. Ba(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form BaO12 cuboctahedra that share corners with eight equivalent Ba(1)O12 cuboctahedra, faces with five equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ta(1)O6 octahedra, and faces with four equivalent Cu(1)O5 square pyramids. La(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. Ta(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TaO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, corners with two equivalent Cu(1)O5 square pyramids, and faces with eight equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Cu(1) is bonded to one O(1) and four equivalent O(2) atoms to form CuO5 square pyramids that share  a cornercorner with one Ta(1)O6 octahedra, corners with four equivalent Cu(1)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1), one Ta(1), and one Cu(1) atom to form distorted OBa4TaCu octahedra that share corners with five equivalent O(1)Ba4TaCu octahedra, corners with eight equivalent O(2)Ba2La2Cu2 octahedra, edges with four equivalent O(1)Ba4TaCu octahedra, and faces with four equivalent O(2)Ba2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent La(1), and two equivalent Cu(1) atoms to form distorted OBa2La2Cu2 octahedra that share corners with four equivalent O(1)Ba4TaCu octahedra, corners with eight equivalent O(2)Ba2La2Cu2 octahedra, edges with three equivalent O(2)Ba2La2Cu2 octahedra, faces with two equivalent O(1)Ba4TaCu octahedra, and faces with four equivalent O(2)Ba2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-68°. In the third O site, O(3) is bonded in a linear geometry to four equivalent Ba(1) and two equivalent Ta(1) atoms. is represented by the CIF card [CIF]
data_Ba2LaTa(CuO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.000
_cell_length_b   4.000
_cell_length_c   12.232
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   195.678
_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  0.000  0.000  0.195  1.0
  Ba  Ba1  1  0.000  0.000  0.805  1.0
  La  La2  1  0.000  0.000  0.500  1.0
  Ta  Ta3  1  0.500  0.500  0.000  1.0
  Cu  Cu4  1  0.500  0.500  0.641  1.0
  Cu  Cu5  1  0.500  0.500  0.359  1.0
  O  O6  1  0.500  0.500  0.162  1.0
  O  O7  1  0.000  0.500  0.628  1.0
  O  O8  1  0.500  0.000  0.628  1.0
  O  O9  1  0.500  0.000  0.372  1.0
  O  O10  1  0.000  0.500  0.372  1.0
  O  O11  1  0.000  0.500  0.000  1.0
  O  O12  1  0.500  0.500  0.838  1.0
  O  O13  1  0.500  0.000  0.000  1.0
[/CIF]
.
The crystal structure described by Ba2LaTa(CuO4)2 crystallizes in the tetragonal P4/mmm space group. Ba(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form BaO12 cuboctahedra that share corners with eight equivalent Ba(1)O12 cuboctahedra, faces with five equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ta(1)O6 octahedra, and faces with four equivalent Cu(1)O5 square pyramids. La(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. Ta(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TaO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, corners with two equivalent Cu(1)O5 square pyramids, and faces with eight equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Cu(1) is bonded to one O(1) and four equivalent O(2) atoms to form CuO5 square pyramids that share  a cornercorner with one Ta(1)O6 octahedra, corners with four equivalent Cu(1)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1), one Ta(1), and one Cu(1) atom to form distorted OBa4TaCu octahedra that share corners with five equivalent O(1)Ba4TaCu octahedra, corners with eight equivalent O(2)Ba2La2Cu2 octahedra, edges with four equivalent O(1)Ba4TaCu octahedra, and faces with four equivalent O(2)Ba2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent La(1), and two equivalent Cu(1) atoms to form distorted OBa2La2Cu2 octahedra that share corners with four equivalent O(1)Ba4TaCu octahedra, corners with eight equivalent O(2)Ba2La2Cu2 octahedra, edges with three equivalent O(2)Ba2La2Cu2 octahedra, faces with two equivalent O(1)Ba4TaCu octahedra, and faces with four equivalent O(2)Ba2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-68°. In the third O site, O(3) is bonded in a linear geometry to four equivalent Ba(1) and two equivalent Ta(1) atoms. is represented by the CIF card [CIF]
data_Ba2LaTa(CuO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.000
_cell_length_b   4.000
_cell_length_c   12.232
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   195.678
_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  0.000  0.000  0.195  1.0
  Ba  Ba1  1  0.000  0.000  0.805  1.0
  La  La2  1  0.000  0.000  0.500  1.0
  Ta  Ta3  1  0.500  0.500  0.000  1.0
  Cu  Cu4  1  0.500  0.500  0.641  1.0
  Cu  Cu5  1  0.500  0.500  0.359  1.0
  O  O6  1  0.500  0.500  0.162  1.0
  O  O7  1  0.000  0.500  0.628  1.0
  O  O8  1  0.500  0.000  0.628  1.0
  O  O9  1  0.500  0.000  0.372  1.0
  O  O10  1  0.000  0.500  0.372  1.0
  O  O11  1  0.000  0.500  0.000  1.0
  O  O12  1  0.500  0.500  0.838  1.0
  O  O13  1  0.500  0.000  0.000  1.0
[/CIF]
.