The structure described by Ba2Co2TlAlO7 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(4), two equivalent O(6), and four equivalent O(7) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Co site, Co(2) is bonded in a 6-coordinate geometry to one O(3), one O(7), two equivalent O(4), and two equivalent O(6) atoms. Tl(1) is bonded in a see-saw-like geometry to one O(1), one O(7), and two equivalent O(5) atoms. Al(1) is bonded in a distorted trigonal pyramidal geometry to one O(2), one O(3), one O(4), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Co(1), and one Tl(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Co(1), and one Al(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Co(2), two equivalent Co(1), and one Al(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ba(2), one Co(1), two equivalent Co(2), and one Al(1) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Ba(1), one Ba(2), and two equivalent Tl(1) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Ba(2), two equivalent Co(2), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to four equivalent Ba(2), one Co(2), and one Tl(1) atom. is represented by the CIF file [CIF]
data_Ba2AlTlCo2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.019
_cell_length_b   4.323
_cell_length_c   11.541
_cell_angle_alpha   89.800
_cell_angle_beta   81.163
_cell_angle_gamma   89.969
_symmetry_Int_Tables_number   1
_cell_volume   198.116
_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  0.388  0.514  0.222  1.0
  Ba  Ba1  1  0.611  0.518  0.778  1.0
  Al  Al2  1  0.503  0.376  0.500  1.0
  Tl  Tl3  1  0.000  0.076  0.000  1.0
  Co  Co4  1  0.861  0.986  0.378  1.0
  Co  Co5  1  0.139  0.986  0.618  1.0
  O  O6  1  0.918  0.979  0.186  1.0
  O  O7  1  0.799  0.535  0.388  1.0
  O  O8  1  0.328  0.086  0.411  1.0
  O  O9  1  0.669  0.086  0.592  1.0
  O  O10  1  0.500  0.347  0.000  1.0
  O  O11  1  0.201  0.535  0.611  1.0
  O  O12  1  0.083  0.977  0.816  1.0
[/CIF]
.
The structure described by Ba2Co2TlAlO7 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(4), two equivalent O(6), and four equivalent O(7) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Co site, Co(2) is bonded in a 6-coordinate geometry to one O(3), one O(7), two equivalent O(4), and two equivalent O(6) atoms. Tl(1) is bonded in a see-saw-like geometry to one O(1), one O(7), and two equivalent O(5) atoms. Al(1) is bonded in a distorted trigonal pyramidal geometry to one O(2), one O(3), one O(4), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Co(1), and one Tl(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Co(1), and one Al(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Co(2), two equivalent Co(1), and one Al(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ba(2), one Co(1), two equivalent Co(2), and one Al(1) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Ba(1), one Ba(2), and two equivalent Tl(1) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Ba(2), two equivalent Co(2), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to four equivalent Ba(2), one Co(2), and one Tl(1) atom. is represented by the CIF file [CIF]
data_Ba2AlTlCo2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.019
_cell_length_b   4.323
_cell_length_c   11.541
_cell_angle_alpha   89.800
_cell_angle_beta   81.163
_cell_angle_gamma   89.969
_symmetry_Int_Tables_number   1
_cell_volume   198.116
_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  0.388  0.514  0.222  1.0
  Ba  Ba1  1  0.611  0.518  0.778  1.0
  Al  Al2  1  0.503  0.376  0.500  1.0
  Tl  Tl3  1  0.000  0.076  0.000  1.0
  Co  Co4  1  0.861  0.986  0.378  1.0
  Co  Co5  1  0.139  0.986  0.618  1.0
  O  O6  1  0.918  0.979  0.186  1.0
  O  O7  1  0.799  0.535  0.388  1.0
  O  O8  1  0.328  0.086  0.411  1.0
  O  O9  1  0.669  0.086  0.592  1.0
  O  O10  1  0.500  0.347  0.000  1.0
  O  O11  1  0.201  0.535  0.611  1.0
  O  O12  1  0.083  0.977  0.816  1.0
[/CIF]
.