The material described by Ba2YCo2TlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(7), one O(8), one O(9), two equivalent O(3), and two equivalent O(4) atoms. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to one O(10), one O(2), one O(7), one O(8), one O(9), two equivalent O(3), and two equivalent O(4) atoms. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(2), two equivalent O(5), and two equivalent O(6) atoms. In the fourth Ba site, Ba(4) is bonded in a 9-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(14), two equivalent O(5), and two equivalent O(6) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(7), one O(8), and one O(9) atom. In the second Y site, Y(2) is bonded in a body-centered cubic geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(7), one O(8), and one O(9) atom. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(3), one O(7), one O(8), and one O(9) atom to form distorted CoO5 square pyramids that share corners with four equivalent Co(3)O5 square pyramids and  a cornercorner with one Tl(1)O4 trigonal pyramid. In the second Co site, Co(2) is bonded to one O(11), one O(12), one O(13), one O(14), and one O(6) atom to form distorted corner-sharing CoO5 square pyramids. In the third Co site, Co(3) is bonded to one O(10), one O(4), one O(7), one O(8), and one O(9) atom to form distorted corner-sharing CoO5 square pyramids. In the fourth Co site, Co(4) is bonded to one O(11), one O(12), one O(13), one O(14), and one O(5) atom to form distorted CoO5 square pyramids that share corners with four equivalent Co(2)O5 square pyramids and  a cornercorner with one Tl(1)O4 trigonal pyramid. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form TlO4 trigonal pyramids that share  a cornercorner with one Co(1)O5 square pyramid and  a cornercorner with one Co(4)O5 square pyramid. In the second Tl site, Tl(2) is bonded in a see-saw-like geometry to one O(1), one O(2), one O(4), and one O(6) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Ba(1), one Ba(4), one Tl(1), and one Tl(2) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Ba(2), one Ba(3), one Tl(1), and one Tl(2) atom. In the third O site, O(3) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Co(1), and one Tl(1) atom to form a mixture of distorted edge and corner-sharing OBa4TlCo octahedra. The corner-sharing octahedral tilt angles range from 19-20°. In the fourth O site, O(4) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Co(3), and one Tl(2) atom to form a mixture of distorted edge and corner-sharing OBa4TlCo octahedra. The corner-sharing octahedral tilt angles range from 18-20°. In the fifth O site, O(5) is bonded to two equivalent Ba(3), two equivalent Ba(4), one Co(4), and one Tl(1) atom to form a mixture of distorted edge and corner-sharing OBa4TlCo octahedra. The corner-sharing octahedral tilt angles range from 19-20°. In the sixth O site, O(6) is bonded to two equivalent Ba(3), two equivalent Ba(4), one Co(2), and one Tl(2) atom to form a mixture of distorted edge and corner-sharing OBa4TlCo octahedra. The corner-sharing octahedral tilt angles range from 18-19°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(3) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(3) atom. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(3) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(3) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Y(1), one Y(2), one Co(2), and one Co(4) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Y(1), one Y(2), one Co(2), and one Co(4) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Y(1), one Y(2), one Co(2), and one Co(4) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Y(1), one Y(2), one Co(2), and one Co(4) atom. is represented by the CIF file [CIF]
data_Ba2YTlCo2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.616
_cell_length_b   5.613
_cell_length_c   13.136
_cell_angle_alpha   77.777
_cell_angle_beta   102.258
_cell_angle_gamma   89.916
_symmetry_Int_Tables_number   1
_cell_volume   394.959
_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
  Ba  Ba0  1  0.608  0.892  0.210  1.0
  Ba  Ba1  1  0.101  0.392  0.207  1.0
  Ba  Ba2  1  0.893  0.602  0.790  1.0
  Ba  Ba3  1  0.399  0.101  0.793  1.0
  Y  Y4  1  0.751  0.747  0.500  1.0
  Y  Y5  1  0.249  0.246  0.500  1.0
  Tl  Tl6  1  0.461  0.466  1.000  1.0
  Tl  Tl7  1  0.039  0.964  0.000  1.0
  Co  Co8  1  0.683  0.314  0.367  1.0
  Co  Co9  1  0.817  0.180  0.634  1.0
  Co  Co10  1  0.184  0.813  0.367  1.0
  Co  Co11  1  0.317  0.680  0.632  1.0
  O  O12  1  0.438  0.055  0.001  1.0
  O  O13  1  0.058  0.554  0.999  1.0
  O  O14  1  0.595  0.421  0.171  1.0
  O  O15  1  0.074  0.918  0.171  1.0
  O  O16  1  0.425  0.591  0.830  1.0
  O  O17  1  0.903  0.092  0.828  1.0
  O  O18  1  0.942  0.055  0.386  1.0
  O  O19  1  0.440  0.554  0.385  1.0
  O  O20  1  0.945  0.552  0.387  1.0
  O  O21  1  0.440  0.057  0.384  1.0
  O  O22  1  0.062  0.437  0.616  1.0
  O  O23  1  0.557  0.940  0.612  1.0
  O  O24  1  0.060  0.938  0.616  1.0
  O  O25  1  0.558  0.437  0.614  1.0
[/CIF]
.
The material described by Ba2YCo2TlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(7), one O(8), one O(9), two equivalent O(3), and two equivalent O(4) atoms. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to one O(10), one O(2), one O(7), one O(8), one O(9), two equivalent O(3), and two equivalent O(4) atoms. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(2), two equivalent O(5), and two equivalent O(6) atoms. In the fourth Ba site, Ba(4) is bonded in a 9-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(14), two equivalent O(5), and two equivalent O(6) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(7), one O(8), and one O(9) atom. In the second Y site, Y(2) is bonded in a body-centered cubic geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(7), one O(8), and one O(9) atom. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(3), one O(7), one O(8), and one O(9) atom to form distorted CoO5 square pyramids that share corners with four equivalent Co(3)O5 square pyramids and  a cornercorner with one Tl(1)O4 trigonal pyramid. In the second Co site, Co(2) is bonded to one O(11), one O(12), one O(13), one O(14), and one O(6) atom to form distorted corner-sharing CoO5 square pyramids. In the third Co site, Co(3) is bonded to one O(10), one O(4), one O(7), one O(8), and one O(9) atom to form distorted corner-sharing CoO5 square pyramids. In the fourth Co site, Co(4) is bonded to one O(11), one O(12), one O(13), one O(14), and one O(5) atom to form distorted CoO5 square pyramids that share corners with four equivalent Co(2)O5 square pyramids and  a cornercorner with one Tl(1)O4 trigonal pyramid. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form TlO4 trigonal pyramids that share  a cornercorner with one Co(1)O5 square pyramid and  a cornercorner with one Co(4)O5 square pyramid. In the second Tl site, Tl(2) is bonded in a see-saw-like geometry to one O(1), one O(2), one O(4), and one O(6) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Ba(1), one Ba(4), one Tl(1), and one Tl(2) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Ba(2), one Ba(3), one Tl(1), and one Tl(2) atom. In the third O site, O(3) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Co(1), and one Tl(1) atom to form a mixture of distorted edge and corner-sharing OBa4TlCo octahedra. The corner-sharing octahedral tilt angles range from 19-20°. In the fourth O site, O(4) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Co(3), and one Tl(2) atom to form a mixture of distorted edge and corner-sharing OBa4TlCo octahedra. The corner-sharing octahedral tilt angles range from 18-20°. In the fifth O site, O(5) is bonded to two equivalent Ba(3), two equivalent Ba(4), one Co(4), and one Tl(1) atom to form a mixture of distorted edge and corner-sharing OBa4TlCo octahedra. The corner-sharing octahedral tilt angles range from 19-20°. In the sixth O site, O(6) is bonded to two equivalent Ba(3), two equivalent Ba(4), one Co(2), and one Tl(2) atom to form a mixture of distorted edge and corner-sharing OBa4TlCo octahedra. The corner-sharing octahedral tilt angles range from 18-19°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(3) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(3) atom. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(3) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(3) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Y(1), one Y(2), one Co(2), and one Co(4) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Y(1), one Y(2), one Co(2), and one Co(4) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Y(1), one Y(2), one Co(2), and one Co(4) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Y(1), one Y(2), one Co(2), and one Co(4) atom. is represented by the CIF file [CIF]
data_Ba2YTlCo2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.616
_cell_length_b   5.613
_cell_length_c   13.136
_cell_angle_alpha   77.777
_cell_angle_beta   102.258
_cell_angle_gamma   89.916
_symmetry_Int_Tables_number   1
_cell_volume   394.959
_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
  Ba  Ba0  1  0.608  0.892  0.210  1.0
  Ba  Ba1  1  0.101  0.392  0.207  1.0
  Ba  Ba2  1  0.893  0.602  0.790  1.0
  Ba  Ba3  1  0.399  0.101  0.793  1.0
  Y  Y4  1  0.751  0.747  0.500  1.0
  Y  Y5  1  0.249  0.246  0.500  1.0
  Tl  Tl6  1  0.461  0.466  1.000  1.0
  Tl  Tl7  1  0.039  0.964  0.000  1.0
  Co  Co8  1  0.683  0.314  0.367  1.0
  Co  Co9  1  0.817  0.180  0.634  1.0
  Co  Co10  1  0.184  0.813  0.367  1.0
  Co  Co11  1  0.317  0.680  0.632  1.0
  O  O12  1  0.438  0.055  0.001  1.0
  O  O13  1  0.058  0.554  0.999  1.0
  O  O14  1  0.595  0.421  0.171  1.0
  O  O15  1  0.074  0.918  0.171  1.0
  O  O16  1  0.425  0.591  0.830  1.0
  O  O17  1  0.903  0.092  0.828  1.0
  O  O18  1  0.942  0.055  0.386  1.0
  O  O19  1  0.440  0.554  0.385  1.0
  O  O20  1  0.945  0.552  0.387  1.0
  O  O21  1  0.440  0.057  0.384  1.0
  O  O22  1  0.062  0.437  0.616  1.0
  O  O23  1  0.557  0.940  0.612  1.0
  O  O24  1  0.060  0.938  0.616  1.0
  O  O25  1  0.558  0.437  0.614  1.0
[/CIF]
.