The compound described by Ba4Ti11O26 crystallizes in the triclinic P1 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 11-coordinate geometry to one O(1), one O(13), one O(2), one O(20), one O(25), one O(26), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the second Ba site, Ba(2) is bonded in a 11-coordinate geometry to one O(1), one O(10), one O(14), one O(19), one O(2), one O(25), one O(26), one O(5), one O(6), one O(7), and one O(8) atom. In the third Ba site, Ba(3) is bonded in a 11-coordinate geometry to one O(1), one O(15), one O(2), one O(20), one O(21), one O(22), one O(23), one O(24), one O(3), one O(4), and one O(9) atom. In the fourth Ba site, Ba(4) is bonded in a 11-coordinate geometry to one O(1), one O(10), one O(16), one O(19), one O(2), one O(21), one O(22), one O(23), one O(24), one O(3), and one O(4) atom. There are eleven inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(10), one O(16), one O(4), one O(7), and one O(9) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 16-18°. In the second Ti site, Ti(2) is bonded to one O(10), one O(15), one O(2), one O(3), one O(8), and one O(9) atom to form a mixture of corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the third Ti site, Ti(3) is bonded to one O(11), one O(12), one O(15), one O(17), one O(3), and one O(5) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 30°. In the fourth Ti site, Ti(4) is bonded to one O(11), one O(12), one O(16), one O(18), one O(4), and one O(6) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 30°. In the fifth Ti site, Ti(5) is bonded to one O(13), one O(14), one O(17), one O(19), one O(5), and one O(7) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 16-25°. In the sixth Ti site, Ti(6) is bonded to one O(13), one O(14), one O(18), one O(20), one O(6), and one O(8) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 17-25°. In the seventh Ti site, Ti(7) is bonded to one O(11), one O(15), one O(16), one O(22), one O(23), and one O(9) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 20-22°. In the eighth Ti site, Ti(8) is bonded to one O(10), one O(12), one O(15), one O(16), one O(21), and one O(24) atom to form a mixture of corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 14-22°. In the ninth Ti site, Ti(9) is bonded in a 6-coordinate geometry to one O(12), one O(13), one O(17), one O(18), one O(24), and one O(26) atom. In the tenth Ti site, Ti(10) is bonded to one O(11), one O(14), one O(17), one O(18), one O(23), and one O(25) atom to form distorted edge-sharing TiO6 octahedra. In the eleventh Ti site, Ti(11) is bonded to one O(14), one O(19), one O(2), one O(20), one O(21), and one O(25) atom to form a mixture of corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-14°. There are twenty-six inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), and one Ti(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Ti(11), and one Ti(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ba(3), one Ba(4), one Ti(2), and one Ti(3) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Ba(3), one Ba(4), one Ti(1), and one Ti(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Ba(1), one Ba(2), one Ti(3), and one Ti(5) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Ba(1), one Ba(2), one Ti(4), and one Ti(6) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Ti(1), and one Ti(5) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Ti(2), and one Ti(6) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(3), one Ti(1), one Ti(2), and one Ti(7) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Ba(2), one Ba(4), one Ti(1), one Ti(2), and one Ti(8) atom. In the eleventh O site, O(11) is bonded to one Ti(10), one Ti(3), one Ti(4), and one Ti(7) atom to form a mixture of corner and edge-sharing OTi4 trigonal pyramids. In the twelfth O site, O(12) is bonded to one Ti(3), one Ti(4), one Ti(8), and one Ti(9) atom to form a mixture of distorted corner and edge-sharing OTi4 trigonal pyramids. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Ba(1), one Ti(5), one Ti(6), and one Ti(9) atom. In the fourteenth O site, O(14) is bonded in a rectangular see-saw-like geometry to one Ba(2), one Ti(10), one Ti(11), one Ti(5), and one Ti(6) atom. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Ba(3), one Ti(2), one Ti(3), one Ti(7), and one Ti(8) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Ba(4), one Ti(1), one Ti(4), one Ti(7), and one Ti(8) atom. In the seventeenth O site, O(17) is bonded to one Ti(10), one Ti(3), one Ti(5), and one Ti(9) atom to form a mixture of corner and edge-sharing OTi4 trigonal pyramids. In the eighteenth O site, O(18) is bonded to one Ti(10), one Ti(4), one Ti(6), and one Ti(9) atom to form a mixture of corner and edge-sharing OTi4 trigonal pyramids. In the nineteenth O site, O(19) is bonded in a water-like geometry to one Ba(2), one Ba(4), one Ti(11), and one Ti(5) atom. In the twentieth O site, O(20) is bonded in a water-like geometry to one Ba(1), one Ba(3), one Ti(11), and one Ti(6) atom. In the twenty-first O site, O(21) is bonded in a distorted rectangular see-saw-like geometry to one Ba(3), one Ba(4), one Ti(11), and one Ti(8) atom. In the twenty-second O site, O(22) is bonded in a distorted single-bond geometry to one Ba(3), one Ba(4), and one Ti(7) atom. In the twenty-third O site, O(23) is bonded in a distorted water-like geometry to one Ba(3), one Ba(4), one Ti(10), and one Ti(7) atom. In the twenty-fourth O site, O(24) is bonded in a distorted water-like geometry to one Ba(3), one Ba(4), one Ti(8), and one Ti(9) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Ti(10), and one Ti(11) atom. In the twenty-sixth O site, O(26) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Ti(9) atom. is represented by the CIF file [CIF]
data_Ba4Ti11O26
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.846
_cell_length_b   7.978
_cell_length_c   10.039
_cell_angle_alpha   91.870
_cell_angle_beta   112.977
_cell_angle_gamma   104.190
_symmetry_Int_Tables_number   1
_cell_volume   555.063
_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  0.917  0.091  0.772  1.0
  Ba  Ba1  1  0.402  0.095  0.772  1.0
  Ba  Ba2  1  0.088  0.894  0.210  1.0
  Ba  Ba3  1  0.569  0.894  0.210  1.0
  Ti  Ti4  1  0.357  0.237  0.095  1.0
  Ti  Ti5  1  0.857  0.240  0.097  1.0
  Ti  Ti6  1  0.054  0.335  0.443  1.0
  Ti  Ti7  1  0.559  0.337  0.446  1.0
  Ti  Ti8  1  0.255  0.498  0.782  1.0
  Ti  Ti9  1  0.775  0.495  0.782  1.0
  Ti  Ti10  1  0.246  0.521  0.229  1.0
  Ti  Ti11  1  0.746  0.526  0.235  1.0
  Ti  Ti12  1  0.952  0.666  0.569  1.0
  Ti  Ti13  1  0.444  0.656  0.563  1.0
  Ti  Ti14  1  0.639  0.757  0.900  1.0
  O  O15  1  0.260  0.022  0.007  1.0
  O  O16  1  0.751  0.002  0.000  1.0
  O  O17  1  0.936  0.146  0.294  1.0
  O  O18  1  0.436  0.150  0.300  1.0
  O  O19  1  0.124  0.260  0.617  1.0
  O  O20  1  0.623  0.258  0.619  1.0
  O  O21  1  0.291  0.344  0.914  1.0
  O  O22  1  0.795  0.338  0.916  1.0
  O  O23  1  0.124  0.275  0.114  1.0
  O  O24  1  0.628  0.275  0.114  1.0
  O  O25  1  0.319  0.403  0.436  1.0
  O  O26  1  0.812  0.397  0.425  1.0
  O  O27  1  0.995  0.505  0.738  1.0
  O  O28  1  0.508  0.520  0.757  1.0
  O  O29  1  0.988  0.475  0.241  1.0
  O  O30  1  0.497  0.485  0.248  1.0
  O  O31  1  0.187  0.597  0.574  1.0
  O  O32  1  0.686  0.596  0.575  1.0
  O  O33  1  0.385  0.719  0.887  1.0
  O  O34  1  0.861  0.716  0.887  1.0
  O  O35  1  0.710  0.664  0.088  1.0
  O  O36  1  0.217  0.662  0.103  1.0
  O  O37  1  0.377  0.738  0.388  1.0
  O  O38  1  0.872  0.727  0.376  1.0
  O  O39  1  0.565  0.852  0.704  1.0
  O  O40  1  0.052  0.875  0.665  1.0
[/CIF]
.
The compound described by Ba4Ti11O26 crystallizes in the triclinic P1 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 11-coordinate geometry to one O(1), one O(13), one O(2), one O(20), one O(25), one O(26), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the second Ba site, Ba(2) is bonded in a 11-coordinate geometry to one O(1), one O(10), one O(14), one O(19), one O(2), one O(25), one O(26), one O(5), one O(6), one O(7), and one O(8) atom. In the third Ba site, Ba(3) is bonded in a 11-coordinate geometry to one O(1), one O(15), one O(2), one O(20), one O(21), one O(22), one O(23), one O(24), one O(3), one O(4), and one O(9) atom. In the fourth Ba site, Ba(4) is bonded in a 11-coordinate geometry to one O(1), one O(10), one O(16), one O(19), one O(2), one O(21), one O(22), one O(23), one O(24), one O(3), and one O(4) atom. There are eleven inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(10), one O(16), one O(4), one O(7), and one O(9) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 16-18°. In the second Ti site, Ti(2) is bonded to one O(10), one O(15), one O(2), one O(3), one O(8), and one O(9) atom to form a mixture of corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the third Ti site, Ti(3) is bonded to one O(11), one O(12), one O(15), one O(17), one O(3), and one O(5) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 30°. In the fourth Ti site, Ti(4) is bonded to one O(11), one O(12), one O(16), one O(18), one O(4), and one O(6) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 30°. In the fifth Ti site, Ti(5) is bonded to one O(13), one O(14), one O(17), one O(19), one O(5), and one O(7) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 16-25°. In the sixth Ti site, Ti(6) is bonded to one O(13), one O(14), one O(18), one O(20), one O(6), and one O(8) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 17-25°. In the seventh Ti site, Ti(7) is bonded to one O(11), one O(15), one O(16), one O(22), one O(23), and one O(9) atom to form a mixture of distorted corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 20-22°. In the eighth Ti site, Ti(8) is bonded to one O(10), one O(12), one O(15), one O(16), one O(21), and one O(24) atom to form a mixture of corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 14-22°. In the ninth Ti site, Ti(9) is bonded in a 6-coordinate geometry to one O(12), one O(13), one O(17), one O(18), one O(24), and one O(26) atom. In the tenth Ti site, Ti(10) is bonded to one O(11), one O(14), one O(17), one O(18), one O(23), and one O(25) atom to form distorted edge-sharing TiO6 octahedra. In the eleventh Ti site, Ti(11) is bonded to one O(14), one O(19), one O(2), one O(20), one O(21), and one O(25) atom to form a mixture of corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-14°. There are twenty-six inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), and one Ti(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Ti(11), and one Ti(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ba(3), one Ba(4), one Ti(2), and one Ti(3) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Ba(3), one Ba(4), one Ti(1), and one Ti(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Ba(1), one Ba(2), one Ti(3), and one Ti(5) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Ba(1), one Ba(2), one Ti(4), and one Ti(6) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Ti(1), and one Ti(5) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Ti(2), and one Ti(6) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(3), one Ti(1), one Ti(2), and one Ti(7) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Ba(2), one Ba(4), one Ti(1), one Ti(2), and one Ti(8) atom. In the eleventh O site, O(11) is bonded to one Ti(10), one Ti(3), one Ti(4), and one Ti(7) atom to form a mixture of corner and edge-sharing OTi4 trigonal pyramids. In the twelfth O site, O(12) is bonded to one Ti(3), one Ti(4), one Ti(8), and one Ti(9) atom to form a mixture of distorted corner and edge-sharing OTi4 trigonal pyramids. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Ba(1), one Ti(5), one Ti(6), and one Ti(9) atom. In the fourteenth O site, O(14) is bonded in a rectangular see-saw-like geometry to one Ba(2), one Ti(10), one Ti(11), one Ti(5), and one Ti(6) atom. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Ba(3), one Ti(2), one Ti(3), one Ti(7), and one Ti(8) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Ba(4), one Ti(1), one Ti(4), one Ti(7), and one Ti(8) atom. In the seventeenth O site, O(17) is bonded to one Ti(10), one Ti(3), one Ti(5), and one Ti(9) atom to form a mixture of corner and edge-sharing OTi4 trigonal pyramids. In the eighteenth O site, O(18) is bonded to one Ti(10), one Ti(4), one Ti(6), and one Ti(9) atom to form a mixture of corner and edge-sharing OTi4 trigonal pyramids. In the nineteenth O site, O(19) is bonded in a water-like geometry to one Ba(2), one Ba(4), one Ti(11), and one Ti(5) atom. In the twentieth O site, O(20) is bonded in a water-like geometry to one Ba(1), one Ba(3), one Ti(11), and one Ti(6) atom. In the twenty-first O site, O(21) is bonded in a distorted rectangular see-saw-like geometry to one Ba(3), one Ba(4), one Ti(11), and one Ti(8) atom. In the twenty-second O site, O(22) is bonded in a distorted single-bond geometry to one Ba(3), one Ba(4), and one Ti(7) atom. In the twenty-third O site, O(23) is bonded in a distorted water-like geometry to one Ba(3), one Ba(4), one Ti(10), and one Ti(7) atom. In the twenty-fourth O site, O(24) is bonded in a distorted water-like geometry to one Ba(3), one Ba(4), one Ti(8), and one Ti(9) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Ti(10), and one Ti(11) atom. In the twenty-sixth O site, O(26) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Ti(9) atom. is represented by the CIF file [CIF]
data_Ba4Ti11O26
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.846
_cell_length_b   7.978
_cell_length_c   10.039
_cell_angle_alpha   91.870
_cell_angle_beta   112.977
_cell_angle_gamma   104.190
_symmetry_Int_Tables_number   1
_cell_volume   555.063
_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  0.917  0.091  0.772  1.0
  Ba  Ba1  1  0.402  0.095  0.772  1.0
  Ba  Ba2  1  0.088  0.894  0.210  1.0
  Ba  Ba3  1  0.569  0.894  0.210  1.0
  Ti  Ti4  1  0.357  0.237  0.095  1.0
  Ti  Ti5  1  0.857  0.240  0.097  1.0
  Ti  Ti6  1  0.054  0.335  0.443  1.0
  Ti  Ti7  1  0.559  0.337  0.446  1.0
  Ti  Ti8  1  0.255  0.498  0.782  1.0
  Ti  Ti9  1  0.775  0.495  0.782  1.0
  Ti  Ti10  1  0.246  0.521  0.229  1.0
  Ti  Ti11  1  0.746  0.526  0.235  1.0
  Ti  Ti12  1  0.952  0.666  0.569  1.0
  Ti  Ti13  1  0.444  0.656  0.563  1.0
  Ti  Ti14  1  0.639  0.757  0.900  1.0
  O  O15  1  0.260  0.022  0.007  1.0
  O  O16  1  0.751  0.002  0.000  1.0
  O  O17  1  0.936  0.146  0.294  1.0
  O  O18  1  0.436  0.150  0.300  1.0
  O  O19  1  0.124  0.260  0.617  1.0
  O  O20  1  0.623  0.258  0.619  1.0
  O  O21  1  0.291  0.344  0.914  1.0
  O  O22  1  0.795  0.338  0.916  1.0
  O  O23  1  0.124  0.275  0.114  1.0
  O  O24  1  0.628  0.275  0.114  1.0
  O  O25  1  0.319  0.403  0.436  1.0
  O  O26  1  0.812  0.397  0.425  1.0
  O  O27  1  0.995  0.505  0.738  1.0
  O  O28  1  0.508  0.520  0.757  1.0
  O  O29  1  0.988  0.475  0.241  1.0
  O  O30  1  0.497  0.485  0.248  1.0
  O  O31  1  0.187  0.597  0.574  1.0
  O  O32  1  0.686  0.596  0.575  1.0
  O  O33  1  0.385  0.719  0.887  1.0
  O  O34  1  0.861  0.716  0.887  1.0
  O  O35  1  0.710  0.664  0.088  1.0
  O  O36  1  0.217  0.662  0.103  1.0
  O  O37  1  0.377  0.738  0.388  1.0
  O  O38  1  0.872  0.727  0.376  1.0
  O  O39  1  0.565  0.852  0.704  1.0
  O  O40  1  0.052  0.875  0.665  1.0
[/CIF]
.