The material structure described by Gd7Ti8O26 crystallizes in the triclinic P1 space group. There are seven inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to one O(1), one O(14), one O(18), one O(22), one O(23), one O(3), one O(7), and one O(8) atom to form distorted GdO8 hexagonal bipyramids that share  an edgeedge with one Gd(3)O7 hexagonal pyramid,  an edgeedge with one Ti(1)O6 octahedra,  an edgeedge with one Ti(6)O6 octahedra,  an edgeedge with one Ti(8)O6 octahedra,  an edgeedge with one Ti(3)O5 trigonal bipyramid, and edges with two equivalent Ti(2)O5 trigonal bipyramids. In the second Gd site, Gd(2) is bonded in a 7-coordinate geometry to one O(11), one O(13), one O(16), one O(2), one O(22), one O(25), and one O(6) atom. In the third Gd site, Gd(3) is bonded to one O(10), one O(12), one O(14), one O(24), one O(26), one O(8), and one O(9) atom to form distorted GdO7 hexagonal pyramids that share  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid,  an edgeedge with one Gd(1)O8 hexagonal bipyramid,  an edgeedge with one Ti(4)O6 octahedra, edges with two equivalent Ti(6)O6 octahedra, and  an edgeedge with one Ti(5)O5 trigonal bipyramid. In the fourth Gd site, Gd(4) is bonded in a 8-coordinate geometry to one O(10), one O(15), one O(17), one O(2), one O(21), one O(25), one O(26), and one O(5) atom. In the fifth Gd site, Gd(5) is bonded in a 8-coordinate geometry to one O(16), one O(2), one O(20), one O(21), one O(22), one O(3), one O(4), and one O(6) atom. In the sixth Gd site, Gd(6) is bonded in a 7-coordinate geometry to one O(11), one O(15), one O(17), one O(2), one O(26), one O(4), and one O(9) atom. In the seventh Gd site, Gd(7) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(19), one O(20), one O(22), one O(23), one O(7), and one O(8) atom. There are eight inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(11), one O(13), one O(17), one O(23), and one O(25) atom to form TiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra, corners with two equivalent Ti(8)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, and  an edgeedge with one Gd(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 33-55°. In the second Ti site, Ti(2) is bonded to one O(1), one O(14), one O(16), one O(18), and one O(3) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Gd(3)O7 hexagonal pyramid,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(3)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, and edges with two equivalent Gd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 34-60°. In the third Ti site, Ti(3) is bonded to one O(15), one O(18), one O(19), one O(5), and one O(7) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Ti(4)O6 octahedra, corners with two equivalent Ti(6)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, and  an edgeedge with one Gd(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 28-56°. In the fourth Ti site, Ti(4) is bonded to one O(10), one O(21), one O(24), one O(25), one O(5), and one O(6) atom to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(3)O5 trigonal bipyramid, corners with two equivalent Ti(5)O5 trigonal bipyramids, and  an edgeedge with one Gd(3)O7 hexagonal pyramid. The corner-sharing octahedral tilt angles range from 42-48°. In the fifth Ti site, Ti(5) is bonded to one O(11), one O(24), one O(4), one O(6), and one O(9) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, and  an edgeedge with one Gd(3)O7 hexagonal pyramid. The corner-sharing octahedral tilt angles range from 31-62°. In the sixth Ti site, Ti(6) is bonded to one O(10), one O(12), one O(14), one O(15), one O(7), and one O(9) atom to form TiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, corners with two equivalent Ti(3)O5 trigonal bipyramids,  an edgeedge with one Gd(1)O8 hexagonal bipyramid, and edges with two equivalent Gd(3)O7 hexagonal pyramids. The corner-sharing octahedral tilt angles are 42°. In the seventh Ti site, Ti(7) is bonded to one O(12), one O(13), one O(16), one O(19), and one O(20) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Gd(3)O7 hexagonal pyramid,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid, and  a cornercorner with one Ti(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 37-60°. In the eighth Ti site, Ti(8) is bonded to one O(17), one O(20), one O(21), one O(23), one O(3), and one O(4) atom to form TiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, and  an edgeedge with one Gd(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 33-55°. There are twenty-six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Gd(1), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded to one Gd(2), one Gd(4), one Gd(5), and one Gd(6) atom to form OGd4 tetrahedra that share  a cornercorner with one O(13)Gd2Ti2 tetrahedra, corners with two equivalent O(6)Gd2Ti2 tetrahedra, corners with two equivalent O(22)Gd4 tetrahedra,  an edgeedge with one O(16)Gd2Ti2 tetrahedra,  an edgeedge with one O(21)Gd2Ti2 tetrahedra,  an edgeedge with one O(4)Gd2Ti2 tetrahedra, and  an edgeedge with one O(15)Gd2Ti2 trigonal pyramid. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(5), one Ti(2), and one Ti(8) atom. In the fourth O site, O(4) is bonded to one Gd(5), one Gd(6), one Ti(5), and one Ti(8) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(16)Gd2Ti2 tetrahedra,  a cornercorner with one O(22)Gd4 tetrahedra, corners with two equivalent O(21)Gd2Ti2 tetrahedra,  a cornercorner with one O(15)Gd2Ti2 trigonal pyramid,  an edgeedge with one O(6)Gd2Ti2 tetrahedra, and  an edgeedge with one O(2)Gd4 tetrahedra. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Gd(4), one Ti(3), and one Ti(4) atom. In the sixth O site, O(6) is bonded to one Gd(2), one Gd(5), one Ti(4), and one Ti(5) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(13)Gd2Ti2 tetrahedra, corners with two equivalent O(16)Gd2Ti2 tetrahedra, corners with two equivalent O(2)Gd4 tetrahedra,  an edgeedge with one O(21)Gd2Ti2 tetrahedra,  an edgeedge with one O(4)Gd2Ti2 tetrahedra, and  an edgeedge with one O(22)Gd4 tetrahedra. In the seventh O site, O(7) is bonded to one Gd(1), one Gd(7), one Ti(3), and one Ti(6) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(13)Gd2Ti2 tetrahedra, corners with two equivalent O(15)Gd2Ti2 trigonal pyramids, and  an edgeedge with one O(22)Gd4 tetrahedra. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Gd(1), one Gd(3), and one Gd(7) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Gd(3), one Gd(6), one Ti(5), and one Ti(6) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Gd(3), one Gd(4), one Ti(4), and one Ti(6) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Gd(2), one Gd(6), one Ti(1), and one Ti(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Gd(3), one Gd(7), one Ti(6), and one Ti(7) atom. In the thirteenth O site, O(13) is bonded to one Gd(2), one Gd(7), one Ti(1), and one Ti(7) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(6)Gd2Ti2 tetrahedra,  a cornercorner with one O(7)Gd2Ti2 tetrahedra,  a cornercorner with one O(2)Gd4 tetrahedra,  an edgeedge with one O(16)Gd2Ti2 tetrahedra, and  an edgeedge with one O(22)Gd4 tetrahedra. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(3), one Ti(2), and one Ti(6) atom. In the fifteenth O site, O(15) is bonded to one Gd(4), one Gd(6), one Ti(3), and one Ti(6) atom to form distorted OGd2Ti2 trigonal pyramids that share  a cornercorner with one O(21)Gd2Ti2 tetrahedra,  a cornercorner with one O(4)Gd2Ti2 tetrahedra, corners with two equivalent O(7)Gd2Ti2 tetrahedra, and  an edgeedge with one O(2)Gd4 tetrahedra. In the sixteenth O site, O(16) is bonded to one Gd(2), one Gd(5), one Ti(2), and one Ti(7) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(21)Gd2Ti2 tetrahedra,  a cornercorner with one O(4)Gd2Ti2 tetrahedra, corners with two equivalent O(6)Gd2Ti2 tetrahedra, corners with two equivalent O(22)Gd4 tetrahedra,  an edgeedge with one O(13)Gd2Ti2 tetrahedra, and  an edgeedge with one O(2)Gd4 tetrahedra. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Gd(4), one Gd(6), one Ti(1), and one Ti(8) atom. In the eighteenth O site, O(18) is bonded in a trigonal non-coplanar geometry to one Gd(1), one Ti(2), and one Ti(3) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal non-coplanar geometry to one Gd(7), one Ti(3), and one Ti(7) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to one Gd(5), one Gd(7), one Ti(7), and one Ti(8) atom. In the twenty-first O site, O(21) is bonded to one Gd(4), one Gd(5), one Ti(4), and one Ti(8) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(16)Gd2Ti2 tetrahedra,  a cornercorner with one O(22)Gd4 tetrahedra, corners with two equivalent O(4)Gd2Ti2 tetrahedra,  a cornercorner with one O(15)Gd2Ti2 trigonal pyramid,  an edgeedge with one O(6)Gd2Ti2 tetrahedra, and  an edgeedge with one O(2)Gd4 tetrahedra. In the twenty-second O site, O(22) is bonded to one Gd(1), one Gd(2), one Gd(5), and one Gd(7) atom to form OGd4 tetrahedra that share  a cornercorner with one O(21)Gd2Ti2 tetrahedra,  a cornercorner with one O(4)Gd2Ti2 tetrahedra, corners with two equivalent O(16)Gd2Ti2 tetrahedra, corners with two equivalent O(2)Gd4 tetrahedra,  an edgeedge with one O(13)Gd2Ti2 tetrahedra,  an edgeedge with one O(6)Gd2Ti2 tetrahedra, and  an edgeedge with one O(7)Gd2Ti2 tetrahedra. In the twenty-third O site, O(23) is bonded in a distorted bent 150 degrees geometry to one Gd(1), one Gd(7), one Ti(1), and one Ti(8) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal non-coplanar geometry to one Gd(3), one Ti(4), and one Ti(5) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Gd(2), one Gd(4), one Ti(1), and one Ti(4) atom. In the twenty-sixth O site, O(26) is bonded in a trigonal non-coplanar geometry to one Gd(3), one Gd(4), and one Gd(6) atom. is represented by the CIF file [CIF]
data_Gd7Ti8O26
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.217
_cell_length_b   14.473
_cell_length_c   12.431
_cell_angle_alpha   30.472
_cell_angle_beta   55.892
_cell_angle_gamma   61.344
_symmetry_Int_Tables_number   1
_cell_volume   545.115
_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
  Gd  Gd0  1  0.995  0.254  0.988  1.0
  Gd  Gd1  1  0.984  0.530  0.981  1.0
  Gd  Gd2  1  0.483  0.996  0.982  1.0
  Gd  Gd3  1  0.007  0.745  0.027  1.0
  Gd  Gd4  1  0.489  0.489  0.028  1.0
  Gd  Gd5  1  0.998  0.232  0.514  1.0
  Gd  Gd6  1  0.982  0.765  0.486  1.0
  Ti  Ti7  1  0.021  0.996  0.489  1.0
  Ti  Ti8  1  0.497  0.291  0.961  1.0
  Ti  Ti9  1  0.975  0.532  0.491  1.0
  Ti  Ti10  1  0.513  0.747  0.997  1.0
  Ti  Ti11  1  0.551  0.240  0.487  1.0
  Ti  Ti12  1  0.506  0.500  0.502  1.0
  Ti  Ti13  1  0.487  0.714  0.538  1.0
  Ti  Ti14  1  0.493  0.994  0.501  1.0
  O  O15  1  0.199  0.177  0.183  1.0
  O  O16  1  0.113  0.503  0.133  1.0
  O  O17  1  0.571  0.202  0.175  1.0
  O  O18  1  0.389  0.218  0.428  1.0
  O  O19  1  0.200  0.648  0.218  1.0
  O  O20  1  0.599  0.496  0.167  1.0
  O  O21  1  0.165  0.507  0.580  1.0
  O  O22  1  0.125  0.005  0.127  1.0
  O  O23  1  0.543  0.305  0.571  1.0
  O  O24  1  0.578  0.692  0.182  1.0
  O  O25  1  0.853  0.208  0.408  1.0
  O  O26  1  0.436  0.722  0.397  1.0
  O  O27  1  0.171  0.796  0.573  1.0
  O  O28  1  0.438  0.283  0.836  1.0
  O  O29  1  0.831  0.484  0.441  1.0
  O  O30  1  0.387  0.501  0.855  1.0
  O  O31  1  0.174  0.000  0.578  1.0
  O  O32  1  0.815  0.317  0.816  1.0
  O  O33  1  0.814  0.718  0.411  1.0
  O  O34  1  0.571  0.816  0.551  1.0
  O  O35  1  0.420  0.789  0.835  1.0
  O  O36  1  0.867  0.503  0.873  1.0
  O  O37  1  0.811  0.004  0.433  1.0
  O  O38  1  0.460  0.996  0.804  1.0
  O  O39  1  0.834  0.795  0.826  1.0
  O  O40  1  0.853  0.000  0.876  1.0
[/CIF]
.
The material structure described by Gd7Ti8O26 crystallizes in the triclinic P1 space group. There are seven inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to one O(1), one O(14), one O(18), one O(22), one O(23), one O(3), one O(7), and one O(8) atom to form distorted GdO8 hexagonal bipyramids that share  an edgeedge with one Gd(3)O7 hexagonal pyramid,  an edgeedge with one Ti(1)O6 octahedra,  an edgeedge with one Ti(6)O6 octahedra,  an edgeedge with one Ti(8)O6 octahedra,  an edgeedge with one Ti(3)O5 trigonal bipyramid, and edges with two equivalent Ti(2)O5 trigonal bipyramids. In the second Gd site, Gd(2) is bonded in a 7-coordinate geometry to one O(11), one O(13), one O(16), one O(2), one O(22), one O(25), and one O(6) atom. In the third Gd site, Gd(3) is bonded to one O(10), one O(12), one O(14), one O(24), one O(26), one O(8), and one O(9) atom to form distorted GdO7 hexagonal pyramids that share  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid,  an edgeedge with one Gd(1)O8 hexagonal bipyramid,  an edgeedge with one Ti(4)O6 octahedra, edges with two equivalent Ti(6)O6 octahedra, and  an edgeedge with one Ti(5)O5 trigonal bipyramid. In the fourth Gd site, Gd(4) is bonded in a 8-coordinate geometry to one O(10), one O(15), one O(17), one O(2), one O(21), one O(25), one O(26), and one O(5) atom. In the fifth Gd site, Gd(5) is bonded in a 8-coordinate geometry to one O(16), one O(2), one O(20), one O(21), one O(22), one O(3), one O(4), and one O(6) atom. In the sixth Gd site, Gd(6) is bonded in a 7-coordinate geometry to one O(11), one O(15), one O(17), one O(2), one O(26), one O(4), and one O(9) atom. In the seventh Gd site, Gd(7) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(19), one O(20), one O(22), one O(23), one O(7), and one O(8) atom. There are eight inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(11), one O(13), one O(17), one O(23), and one O(25) atom to form TiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra, corners with two equivalent Ti(8)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, and  an edgeedge with one Gd(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 33-55°. In the second Ti site, Ti(2) is bonded to one O(1), one O(14), one O(16), one O(18), and one O(3) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Gd(3)O7 hexagonal pyramid,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(3)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, and edges with two equivalent Gd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 34-60°. In the third Ti site, Ti(3) is bonded to one O(15), one O(18), one O(19), one O(5), and one O(7) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Ti(4)O6 octahedra, corners with two equivalent Ti(6)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, and  an edgeedge with one Gd(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 28-56°. In the fourth Ti site, Ti(4) is bonded to one O(10), one O(21), one O(24), one O(25), one O(5), and one O(6) atom to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(3)O5 trigonal bipyramid, corners with two equivalent Ti(5)O5 trigonal bipyramids, and  an edgeedge with one Gd(3)O7 hexagonal pyramid. The corner-sharing octahedral tilt angles range from 42-48°. In the fifth Ti site, Ti(5) is bonded to one O(11), one O(24), one O(4), one O(6), and one O(9) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, and  an edgeedge with one Gd(3)O7 hexagonal pyramid. The corner-sharing octahedral tilt angles range from 31-62°. In the sixth Ti site, Ti(6) is bonded to one O(10), one O(12), one O(14), one O(15), one O(7), and one O(9) atom to form TiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, corners with two equivalent Ti(3)O5 trigonal bipyramids,  an edgeedge with one Gd(1)O8 hexagonal bipyramid, and edges with two equivalent Gd(3)O7 hexagonal pyramids. The corner-sharing octahedral tilt angles are 42°. In the seventh Ti site, Ti(7) is bonded to one O(12), one O(13), one O(16), one O(19), and one O(20) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Gd(3)O7 hexagonal pyramid,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid, and  a cornercorner with one Ti(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 37-60°. In the eighth Ti site, Ti(8) is bonded to one O(17), one O(20), one O(21), one O(23), one O(3), and one O(4) atom to form TiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid,  a cornercorner with one Ti(7)O5 trigonal bipyramid, and  an edgeedge with one Gd(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 33-55°. There are twenty-six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Gd(1), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded to one Gd(2), one Gd(4), one Gd(5), and one Gd(6) atom to form OGd4 tetrahedra that share  a cornercorner with one O(13)Gd2Ti2 tetrahedra, corners with two equivalent O(6)Gd2Ti2 tetrahedra, corners with two equivalent O(22)Gd4 tetrahedra,  an edgeedge with one O(16)Gd2Ti2 tetrahedra,  an edgeedge with one O(21)Gd2Ti2 tetrahedra,  an edgeedge with one O(4)Gd2Ti2 tetrahedra, and  an edgeedge with one O(15)Gd2Ti2 trigonal pyramid. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(5), one Ti(2), and one Ti(8) atom. In the fourth O site, O(4) is bonded to one Gd(5), one Gd(6), one Ti(5), and one Ti(8) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(16)Gd2Ti2 tetrahedra,  a cornercorner with one O(22)Gd4 tetrahedra, corners with two equivalent O(21)Gd2Ti2 tetrahedra,  a cornercorner with one O(15)Gd2Ti2 trigonal pyramid,  an edgeedge with one O(6)Gd2Ti2 tetrahedra, and  an edgeedge with one O(2)Gd4 tetrahedra. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Gd(4), one Ti(3), and one Ti(4) atom. In the sixth O site, O(6) is bonded to one Gd(2), one Gd(5), one Ti(4), and one Ti(5) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(13)Gd2Ti2 tetrahedra, corners with two equivalent O(16)Gd2Ti2 tetrahedra, corners with two equivalent O(2)Gd4 tetrahedra,  an edgeedge with one O(21)Gd2Ti2 tetrahedra,  an edgeedge with one O(4)Gd2Ti2 tetrahedra, and  an edgeedge with one O(22)Gd4 tetrahedra. In the seventh O site, O(7) is bonded to one Gd(1), one Gd(7), one Ti(3), and one Ti(6) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(13)Gd2Ti2 tetrahedra, corners with two equivalent O(15)Gd2Ti2 trigonal pyramids, and  an edgeedge with one O(22)Gd4 tetrahedra. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Gd(1), one Gd(3), and one Gd(7) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Gd(3), one Gd(6), one Ti(5), and one Ti(6) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Gd(3), one Gd(4), one Ti(4), and one Ti(6) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Gd(2), one Gd(6), one Ti(1), and one Ti(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Gd(3), one Gd(7), one Ti(6), and one Ti(7) atom. In the thirteenth O site, O(13) is bonded to one Gd(2), one Gd(7), one Ti(1), and one Ti(7) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(6)Gd2Ti2 tetrahedra,  a cornercorner with one O(7)Gd2Ti2 tetrahedra,  a cornercorner with one O(2)Gd4 tetrahedra,  an edgeedge with one O(16)Gd2Ti2 tetrahedra, and  an edgeedge with one O(22)Gd4 tetrahedra. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(3), one Ti(2), and one Ti(6) atom. In the fifteenth O site, O(15) is bonded to one Gd(4), one Gd(6), one Ti(3), and one Ti(6) atom to form distorted OGd2Ti2 trigonal pyramids that share  a cornercorner with one O(21)Gd2Ti2 tetrahedra,  a cornercorner with one O(4)Gd2Ti2 tetrahedra, corners with two equivalent O(7)Gd2Ti2 tetrahedra, and  an edgeedge with one O(2)Gd4 tetrahedra. In the sixteenth O site, O(16) is bonded to one Gd(2), one Gd(5), one Ti(2), and one Ti(7) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(21)Gd2Ti2 tetrahedra,  a cornercorner with one O(4)Gd2Ti2 tetrahedra, corners with two equivalent O(6)Gd2Ti2 tetrahedra, corners with two equivalent O(22)Gd4 tetrahedra,  an edgeedge with one O(13)Gd2Ti2 tetrahedra, and  an edgeedge with one O(2)Gd4 tetrahedra. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Gd(4), one Gd(6), one Ti(1), and one Ti(8) atom. In the eighteenth O site, O(18) is bonded in a trigonal non-coplanar geometry to one Gd(1), one Ti(2), and one Ti(3) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal non-coplanar geometry to one Gd(7), one Ti(3), and one Ti(7) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to one Gd(5), one Gd(7), one Ti(7), and one Ti(8) atom. In the twenty-first O site, O(21) is bonded to one Gd(4), one Gd(5), one Ti(4), and one Ti(8) atom to form distorted OGd2Ti2 tetrahedra that share  a cornercorner with one O(16)Gd2Ti2 tetrahedra,  a cornercorner with one O(22)Gd4 tetrahedra, corners with two equivalent O(4)Gd2Ti2 tetrahedra,  a cornercorner with one O(15)Gd2Ti2 trigonal pyramid,  an edgeedge with one O(6)Gd2Ti2 tetrahedra, and  an edgeedge with one O(2)Gd4 tetrahedra. In the twenty-second O site, O(22) is bonded to one Gd(1), one Gd(2), one Gd(5), and one Gd(7) atom to form OGd4 tetrahedra that share  a cornercorner with one O(21)Gd2Ti2 tetrahedra,  a cornercorner with one O(4)Gd2Ti2 tetrahedra, corners with two equivalent O(16)Gd2Ti2 tetrahedra, corners with two equivalent O(2)Gd4 tetrahedra,  an edgeedge with one O(13)Gd2Ti2 tetrahedra,  an edgeedge with one O(6)Gd2Ti2 tetrahedra, and  an edgeedge with one O(7)Gd2Ti2 tetrahedra. In the twenty-third O site, O(23) is bonded in a distorted bent 150 degrees geometry to one Gd(1), one Gd(7), one Ti(1), and one Ti(8) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal non-coplanar geometry to one Gd(3), one Ti(4), and one Ti(5) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Gd(2), one Gd(4), one Ti(1), and one Ti(4) atom. In the twenty-sixth O site, O(26) is bonded in a trigonal non-coplanar geometry to one Gd(3), one Gd(4), and one Gd(6) atom. is represented by the CIF file [CIF]
data_Gd7Ti8O26
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.217
_cell_length_b   14.473
_cell_length_c   12.431
_cell_angle_alpha   30.472
_cell_angle_beta   55.892
_cell_angle_gamma   61.344
_symmetry_Int_Tables_number   1
_cell_volume   545.115
_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
  Gd  Gd0  1  0.995  0.254  0.988  1.0
  Gd  Gd1  1  0.984  0.530  0.981  1.0
  Gd  Gd2  1  0.483  0.996  0.982  1.0
  Gd  Gd3  1  0.007  0.745  0.027  1.0
  Gd  Gd4  1  0.489  0.489  0.028  1.0
  Gd  Gd5  1  0.998  0.232  0.514  1.0
  Gd  Gd6  1  0.982  0.765  0.486  1.0
  Ti  Ti7  1  0.021  0.996  0.489  1.0
  Ti  Ti8  1  0.497  0.291  0.961  1.0
  Ti  Ti9  1  0.975  0.532  0.491  1.0
  Ti  Ti10  1  0.513  0.747  0.997  1.0
  Ti  Ti11  1  0.551  0.240  0.487  1.0
  Ti  Ti12  1  0.506  0.500  0.502  1.0
  Ti  Ti13  1  0.487  0.714  0.538  1.0
  Ti  Ti14  1  0.493  0.994  0.501  1.0
  O  O15  1  0.199  0.177  0.183  1.0
  O  O16  1  0.113  0.503  0.133  1.0
  O  O17  1  0.571  0.202  0.175  1.0
  O  O18  1  0.389  0.218  0.428  1.0
  O  O19  1  0.200  0.648  0.218  1.0
  O  O20  1  0.599  0.496  0.167  1.0
  O  O21  1  0.165  0.507  0.580  1.0
  O  O22  1  0.125  0.005  0.127  1.0
  O  O23  1  0.543  0.305  0.571  1.0
  O  O24  1  0.578  0.692  0.182  1.0
  O  O25  1  0.853  0.208  0.408  1.0
  O  O26  1  0.436  0.722  0.397  1.0
  O  O27  1  0.171  0.796  0.573  1.0
  O  O28  1  0.438  0.283  0.836  1.0
  O  O29  1  0.831  0.484  0.441  1.0
  O  O30  1  0.387  0.501  0.855  1.0
  O  O31  1  0.174  0.000  0.578  1.0
  O  O32  1  0.815  0.317  0.816  1.0
  O  O33  1  0.814  0.718  0.411  1.0
  O  O34  1  0.571  0.816  0.551  1.0
  O  O35  1  0.420  0.789  0.835  1.0
  O  O36  1  0.867  0.503  0.873  1.0
  O  O37  1  0.811  0.004  0.433  1.0
  O  O38  1  0.460  0.996  0.804  1.0
  O  O39  1  0.834  0.795  0.826  1.0
  O  O40  1  0.853  0.000  0.876  1.0
[/CIF]
.