The compound described by La5Ti5O17 crystallizes in the monoclinic Pc space group. There are five inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to one O(1), one O(7), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. In the second La site, La(2) is bonded to one O(10), one O(4), two equivalent O(5), two equivalent O(6), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms to form distorted LaO12 cuboctahedra that share corners with two equivalent La(2)O12 cuboctahedra, faces with two equivalent La(2)O12 cuboctahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(4)O6 octahedra, and faces with four equivalent Ti(3)O6 octahedra. In the third La site, La(3) is bonded in a 12-coordinate geometry to one O(15), one O(7), two equivalent O(10), two equivalent O(16), two equivalent O(17), two equivalent O(8), and two equivalent O(9) atoms. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(15), two equivalent O(13), and two equivalent O(14) atoms. In the fifth La site, La(5) is bonded in a 7-coordinate geometry to one O(1), one O(13), one O(14), two equivalent O(11), and two equivalent O(12) atoms. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(11), one O(12), one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 14-36°. In the second Ti site, Ti(2) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, and faces with two equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 14-36°. In the third Ti site, Ti(3) is bonded to one O(5), one O(6), one O(8), one O(9), and two equivalent O(7) atoms to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, and faces with four equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-24°. In the fourth Ti site, Ti(4) is bonded to one O(16), one O(17), one O(8), one O(9), and two equivalent O(10) atoms to form TiO6 octahedra that share corners with two equivalent Ti(3)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, corners with two equivalent Ti(5)O6 octahedra, and faces with two equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 15-37°. In the fifth Ti site, Ti(5) is bonded to one O(13), one O(14), one O(16), one O(17), and two equivalent O(15) atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 15-37°. There are seventeen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(1), one La(5), and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent La(1), one Ti(1), and one Ti(2) atom. In the third O site, O(3) is bonded to two equivalent La(1), one Ti(1), and one Ti(2) atom to form distorted OLa2Ti2 tetrahedra that share corners with two equivalent O(4)La3Ti2 square pyramids,  a cornercorner with one O(11)La3Ti tetrahedra, corners with two equivalent O(3)La2Ti2 tetrahedra, and edges with two equivalent O(4)La3Ti2 square pyramids. In the fourth O site, O(4) is bonded to one La(2), two equivalent La(1), and two equivalent Ti(2) atoms to form distorted OLa3Ti2 square pyramids that share  a cornercorner with one O(10)La3Ti2 square pyramid, corners with four equivalent O(4)La3Ti2 square pyramids, corners with two equivalent O(3)La2Ti2 tetrahedra, and edges with two equivalent O(3)La2Ti2 tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent La(1), two equivalent La(2), one Ti(2), and one Ti(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent La(2), one Ti(2), and one Ti(3) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one La(1), one La(3), two equivalent La(2), and two equivalent Ti(3) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent La(2), two equivalent La(3), one Ti(3), and one Ti(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to two equivalent La(2), two equivalent La(3), one Ti(3), and one Ti(4) atom. In the tenth O site, O(10) is bonded to one La(2), two equivalent La(3), and two equivalent Ti(4) atoms to form distorted OLa3Ti2 square pyramids that share  a cornercorner with one O(4)La3Ti2 square pyramid, corners with four equivalent O(10)La3Ti2 square pyramids, corners with two equivalent O(17)La2Ti2 tetrahedra, and edges with two equivalent O(17)La2Ti2 tetrahedra. In the eleventh O site, O(11) is bonded to one La(4), two equivalent La(5), and one Ti(1) atom to form OLa3Ti tetrahedra that share  a cornercorner with one O(3)La2Ti2 tetrahedra, corners with two equivalent O(11)La3Ti tetrahedra, and corners with four equivalent O(14)La3Ti tetrahedra. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(4), two equivalent La(5), and one Ti(1) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(5), two equivalent La(4), and one Ti(5) atom. In the fourteenth O site, O(14) is bonded to one La(5), two equivalent La(4), and one Ti(5) atom to form distorted OLa3Ti tetrahedra that share  a cornercorner with one O(17)La2Ti2 tetrahedra, corners with two equivalent O(14)La3Ti tetrahedra, and corners with four equivalent O(11)La3Ti tetrahedra. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one La(3), one La(4), and two equivalent Ti(5) atoms. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to two equivalent La(3), one Ti(4), and one Ti(5) atom. In the seventeenth O site, O(17) is bonded to two equivalent La(3), one Ti(4), and one Ti(5) atom to form distorted OLa2Ti2 tetrahedra that share corners with two equivalent O(10)La3Ti2 square pyramids,  a cornercorner with one O(14)La3Ti tetrahedra, corners with two equivalent O(17)La2Ti2 tetrahedra, and edges with two equivalent O(10)La3Ti2 square pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_La5Ti5O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.949
_cell_length_b   5.501
_cell_length_c   31.272
_cell_angle_alpha   90.000
_cell_angle_beta   90.002
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   679.361
_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
  La  La0  1  0.005  0.242  0.113  1.0
  La  La1  1  0.505  0.758  0.613  1.0
  La  La2  1  0.004  0.757  0.205  1.0
  La  La3  1  0.504  0.243  0.705  1.0
  La  La4  1  0.005  0.268  0.298  1.0
  La  La5  1  0.505  0.732  0.798  1.0
  La  La6  1  0.007  0.678  0.418  1.0
  La  La7  1  0.507  0.322  0.918  1.0
  La  La8  1  0.506  0.175  0.492  1.0
  La  La9  1  0.006  0.825  0.992  1.0
  Ti  Ti10  1  0.506  0.290  0.028  1.0
  Ti  Ti11  1  0.006  0.710  0.528  1.0
  Ti  Ti12  1  0.505  0.759  0.114  1.0
  Ti  Ti13  1  0.005  0.241  0.614  1.0
  Ti  Ti14  1  0.502  0.257  0.205  1.0
  Ti  Ti15  1  0.002  0.743  0.705  1.0
  Ti  Ti16  1  0.505  0.751  0.297  1.0
  Ti  Ti17  1  0.005  0.249  0.797  1.0
  Ti  Ti18  1  0.507  0.217  0.383  1.0
  Ti  Ti19  1  0.007  0.783  0.883  1.0
  O  O20  1  0.006  0.257  0.034  1.0
  O  O21  1  0.506  0.743  0.534  1.0
  O  O22  1  0.506  0.972  0.069  1.0
  O  O23  1  0.006  0.028  0.569  1.0
  O  O24  1  0.505  0.450  0.085  1.0
  O  O25  1  0.005  0.550  0.585  1.0
  O  O26  1  0.005  0.748  0.122  1.0
  O  O27  1  0.505  0.252  0.622  1.0
  O  O28  1  0.504  0.048  0.154  1.0
  O  O29  1  0.004  0.952  0.654  1.0
  O  O30  1  0.504  0.553  0.171  1.0
  O  O31  1  0.004  0.447  0.671  1.0
  O  O32  1  0.003  0.257  0.205  1.0
  O  O33  1  0.503  0.743  0.705  1.0
  O  O34  1  0.504  0.961  0.240  1.0
  O  O35  1  0.004  0.039  0.740  1.0
  O  O36  1  0.505  0.464  0.257  1.0
  O  O37  1  0.005  0.536  0.757  1.0
  O  O38  1  0.005  0.764  0.289  1.0
  O  O39  1  0.505  0.236  0.789  1.0
  O  O40  1  0.506  0.069  0.981  1.0
  O  O41  1  0.006  0.931  0.481  1.0
  O  O42  1  0.506  0.556  0.993  1.0
  O  O43  1  0.006  0.444  0.493  1.0
  O  O44  1  0.007  0.050  0.917  1.0
  O  O45  1  0.507  0.950  0.417  1.0
  O  O46  1  0.007  0.563  0.930  1.0
  O  O47  1  0.507  0.437  0.430  1.0
  O  O48  1  0.506  0.749  0.877  1.0
  O  O49  1  0.006  0.251  0.377  1.0
  O  O50  1  0.006  0.460  0.842  1.0
  O  O51  1  0.506  0.540  0.342  1.0
  O  O52  1  0.006  0.938  0.826  1.0
  O  O53  1  0.506  0.062  0.326  1.0
[/CIF]
.
The compound described by La5Ti5O17 crystallizes in the monoclinic Pc space group. There are five inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to one O(1), one O(7), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. In the second La site, La(2) is bonded to one O(10), one O(4), two equivalent O(5), two equivalent O(6), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms to form distorted LaO12 cuboctahedra that share corners with two equivalent La(2)O12 cuboctahedra, faces with two equivalent La(2)O12 cuboctahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(4)O6 octahedra, and faces with four equivalent Ti(3)O6 octahedra. In the third La site, La(3) is bonded in a 12-coordinate geometry to one O(15), one O(7), two equivalent O(10), two equivalent O(16), two equivalent O(17), two equivalent O(8), and two equivalent O(9) atoms. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(15), two equivalent O(13), and two equivalent O(14) atoms. In the fifth La site, La(5) is bonded in a 7-coordinate geometry to one O(1), one O(13), one O(14), two equivalent O(11), and two equivalent O(12) atoms. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(11), one O(12), one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 14-36°. In the second Ti site, Ti(2) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, and faces with two equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 14-36°. In the third Ti site, Ti(3) is bonded to one O(5), one O(6), one O(8), one O(9), and two equivalent O(7) atoms to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, and faces with four equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-24°. In the fourth Ti site, Ti(4) is bonded to one O(16), one O(17), one O(8), one O(9), and two equivalent O(10) atoms to form TiO6 octahedra that share corners with two equivalent Ti(3)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, corners with two equivalent Ti(5)O6 octahedra, and faces with two equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 15-37°. In the fifth Ti site, Ti(5) is bonded to one O(13), one O(14), one O(16), one O(17), and two equivalent O(15) atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 15-37°. There are seventeen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(1), one La(5), and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent La(1), one Ti(1), and one Ti(2) atom. In the third O site, O(3) is bonded to two equivalent La(1), one Ti(1), and one Ti(2) atom to form distorted OLa2Ti2 tetrahedra that share corners with two equivalent O(4)La3Ti2 square pyramids,  a cornercorner with one O(11)La3Ti tetrahedra, corners with two equivalent O(3)La2Ti2 tetrahedra, and edges with two equivalent O(4)La3Ti2 square pyramids. In the fourth O site, O(4) is bonded to one La(2), two equivalent La(1), and two equivalent Ti(2) atoms to form distorted OLa3Ti2 square pyramids that share  a cornercorner with one O(10)La3Ti2 square pyramid, corners with four equivalent O(4)La3Ti2 square pyramids, corners with two equivalent O(3)La2Ti2 tetrahedra, and edges with two equivalent O(3)La2Ti2 tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent La(1), two equivalent La(2), one Ti(2), and one Ti(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent La(2), one Ti(2), and one Ti(3) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one La(1), one La(3), two equivalent La(2), and two equivalent Ti(3) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent La(2), two equivalent La(3), one Ti(3), and one Ti(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to two equivalent La(2), two equivalent La(3), one Ti(3), and one Ti(4) atom. In the tenth O site, O(10) is bonded to one La(2), two equivalent La(3), and two equivalent Ti(4) atoms to form distorted OLa3Ti2 square pyramids that share  a cornercorner with one O(4)La3Ti2 square pyramid, corners with four equivalent O(10)La3Ti2 square pyramids, corners with two equivalent O(17)La2Ti2 tetrahedra, and edges with two equivalent O(17)La2Ti2 tetrahedra. In the eleventh O site, O(11) is bonded to one La(4), two equivalent La(5), and one Ti(1) atom to form OLa3Ti tetrahedra that share  a cornercorner with one O(3)La2Ti2 tetrahedra, corners with two equivalent O(11)La3Ti tetrahedra, and corners with four equivalent O(14)La3Ti tetrahedra. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(4), two equivalent La(5), and one Ti(1) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(5), two equivalent La(4), and one Ti(5) atom. In the fourteenth O site, O(14) is bonded to one La(5), two equivalent La(4), and one Ti(5) atom to form distorted OLa3Ti tetrahedra that share  a cornercorner with one O(17)La2Ti2 tetrahedra, corners with two equivalent O(14)La3Ti tetrahedra, and corners with four equivalent O(11)La3Ti tetrahedra. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one La(3), one La(4), and two equivalent Ti(5) atoms. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to two equivalent La(3), one Ti(4), and one Ti(5) atom. In the seventeenth O site, O(17) is bonded to two equivalent La(3), one Ti(4), and one Ti(5) atom to form distorted OLa2Ti2 tetrahedra that share corners with two equivalent O(10)La3Ti2 square pyramids,  a cornercorner with one O(14)La3Ti tetrahedra, corners with two equivalent O(17)La2Ti2 tetrahedra, and edges with two equivalent O(10)La3Ti2 square pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_La5Ti5O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.949
_cell_length_b   5.501
_cell_length_c   31.272
_cell_angle_alpha   90.000
_cell_angle_beta   90.002
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   679.361
_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
  La  La0  1  0.005  0.242  0.113  1.0
  La  La1  1  0.505  0.758  0.613  1.0
  La  La2  1  0.004  0.757  0.205  1.0
  La  La3  1  0.504  0.243  0.705  1.0
  La  La4  1  0.005  0.268  0.298  1.0
  La  La5  1  0.505  0.732  0.798  1.0
  La  La6  1  0.007  0.678  0.418  1.0
  La  La7  1  0.507  0.322  0.918  1.0
  La  La8  1  0.506  0.175  0.492  1.0
  La  La9  1  0.006  0.825  0.992  1.0
  Ti  Ti10  1  0.506  0.290  0.028  1.0
  Ti  Ti11  1  0.006  0.710  0.528  1.0
  Ti  Ti12  1  0.505  0.759  0.114  1.0
  Ti  Ti13  1  0.005  0.241  0.614  1.0
  Ti  Ti14  1  0.502  0.257  0.205  1.0
  Ti  Ti15  1  0.002  0.743  0.705  1.0
  Ti  Ti16  1  0.505  0.751  0.297  1.0
  Ti  Ti17  1  0.005  0.249  0.797  1.0
  Ti  Ti18  1  0.507  0.217  0.383  1.0
  Ti  Ti19  1  0.007  0.783  0.883  1.0
  O  O20  1  0.006  0.257  0.034  1.0
  O  O21  1  0.506  0.743  0.534  1.0
  O  O22  1  0.506  0.972  0.069  1.0
  O  O23  1  0.006  0.028  0.569  1.0
  O  O24  1  0.505  0.450  0.085  1.0
  O  O25  1  0.005  0.550  0.585  1.0
  O  O26  1  0.005  0.748  0.122  1.0
  O  O27  1  0.505  0.252  0.622  1.0
  O  O28  1  0.504  0.048  0.154  1.0
  O  O29  1  0.004  0.952  0.654  1.0
  O  O30  1  0.504  0.553  0.171  1.0
  O  O31  1  0.004  0.447  0.671  1.0
  O  O32  1  0.003  0.257  0.205  1.0
  O  O33  1  0.503  0.743  0.705  1.0
  O  O34  1  0.504  0.961  0.240  1.0
  O  O35  1  0.004  0.039  0.740  1.0
  O  O36  1  0.505  0.464  0.257  1.0
  O  O37  1  0.005  0.536  0.757  1.0
  O  O38  1  0.005  0.764  0.289  1.0
  O  O39  1  0.505  0.236  0.789  1.0
  O  O40  1  0.506  0.069  0.981  1.0
  O  O41  1  0.006  0.931  0.481  1.0
  O  O42  1  0.506  0.556  0.993  1.0
  O  O43  1  0.006  0.444  0.493  1.0
  O  O44  1  0.007  0.050  0.917  1.0
  O  O45  1  0.507  0.950  0.417  1.0
  O  O46  1  0.007  0.563  0.930  1.0
  O  O47  1  0.507  0.437  0.430  1.0
  O  O48  1  0.506  0.749  0.877  1.0
  O  O49  1  0.006  0.251  0.377  1.0
  O  O50  1  0.006  0.460  0.842  1.0
  O  O51  1  0.506  0.540  0.342  1.0
  O  O52  1  0.006  0.938  0.826  1.0
  O  O53  1  0.506  0.062  0.326  1.0
[/CIF]
.