The crystal structure described by Cs2TiSi6O15 crystallizes in the monoclinic C2/c space group. Cs(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(6), two equivalent O(7), and two equivalent O(8) atoms. Ti(1) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form TiO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the third Si site, Si(3) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 31°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Si(1) and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Cs(1), one Si(1), and one Si(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cs(1), one Si(2), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Ti(1), and one Si(3) atom. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent Si(3) atoms. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Cs(1), one Ti(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Ti(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent Cs(1), one Si(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs2Ti(Si2O5)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.436
_cell_length_b   7.671
_cell_length_c   15.039
_cell_angle_alpha   76.718
_cell_angle_beta   75.692
_cell_angle_gamma   61.016
_symmetry_Int_Tables_number   1
_cell_volume   720.995
_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
  Cs  Cs0  1  0.623  0.825  0.409  1.0
  Cs  Cs1  1  0.377  0.175  0.591  1.0
  Cs  Cs2  1  0.142  0.325  0.909  1.0
  Cs  Cs3  1  0.858  0.675  0.091  1.0
  Ti  Ti4  1  0.500  0.500  0.000  1.0
  Ti  Ti5  1  0.000  0.000  0.500  1.0
  Si  Si6  1  0.397  0.189  0.169  1.0
  Si  Si7  1  0.116  0.336  0.360  1.0
  Si  Si8  1  0.811  0.164  0.140  1.0
  Si  Si9  1  0.245  0.689  0.669  1.0
  Si  Si10  1  0.189  0.836  0.860  1.0
  Si  Si11  1  0.269  0.860  0.145  1.0
  Si  Si12  1  0.274  0.640  0.355  1.0
  Si  Si13  1  0.884  0.664  0.640  1.0
  Si  Si14  1  0.603  0.811  0.831  1.0
  Si  Si15  1  0.726  0.360  0.645  1.0
  Si  Si16  1  0.755  0.311  0.331  1.0
  Si  Si17  1  0.731  0.140  0.855  1.0
  O  O18  1  0.337  0.032  0.144  1.0
  O  O19  1  0.294  0.238  0.274  1.0
  O  O20  1  0.037  0.976  0.117  1.0
  O  O21  1  0.786  0.208  0.575  1.0
  O  O22  1  0.486  0.532  0.644  1.0
  O  O23  1  0.663  0.968  0.856  1.0
  O  O24  1  0.870  0.476  0.617  1.0
  O  O25  1  0.250  0.750  0.250  1.0
  O  O26  1  0.661  0.613  0.904  1.0
  O  O27  1  0.569  0.291  0.926  1.0
  O  O28  1  0.750  0.250  0.750  1.0
  O  O29  1  0.756  0.332  0.053  1.0
  O  O30  1  0.431  0.709  0.074  1.0
  O  O31  1  0.113  0.568  0.671  1.0
  O  O32  1  0.194  0.737  0.774  1.0
  O  O33  1  0.339  0.387  0.096  1.0
  O  O34  1  0.859  0.832  0.553  1.0
  O  O35  1  0.963  0.024  0.883  1.0
  O  O36  1  0.806  0.263  0.226  1.0
  O  O37  1  0.514  0.468  0.356  1.0
  O  O38  1  0.178  0.887  0.596  1.0
  O  O39  1  0.141  0.168  0.447  1.0
  O  O40  1  0.648  0.068  0.171  1.0
  O  O41  1  0.214  0.792  0.425  1.0
  O  O42  1  0.887  0.432  0.329  1.0
  O  O43  1  0.130  0.524  0.383  1.0
  O  O44  1  0.352  0.932  0.829  1.0
  O  O45  1  0.706  0.762  0.726  1.0
  O  O46  1  0.822  0.113  0.404  1.0
  O  O47  1  0.244  0.668  0.947  1.0
[/CIF]
.
The crystal structure described by Cs2TiSi6O15 crystallizes in the monoclinic C2/c space group. Cs(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(6), two equivalent O(7), and two equivalent O(8) atoms. Ti(1) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form TiO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the third Si site, Si(3) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 31°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Si(1) and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Cs(1), one Si(1), and one Si(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cs(1), one Si(2), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Ti(1), and one Si(3) atom. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent Si(3) atoms. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Cs(1), one Ti(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Ti(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent Cs(1), one Si(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs2Ti(Si2O5)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.436
_cell_length_b   7.671
_cell_length_c   15.039
_cell_angle_alpha   76.718
_cell_angle_beta   75.692
_cell_angle_gamma   61.016
_symmetry_Int_Tables_number   1
_cell_volume   720.995
_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
  Cs  Cs0  1  0.623  0.825  0.409  1.0
  Cs  Cs1  1  0.377  0.175  0.591  1.0
  Cs  Cs2  1  0.142  0.325  0.909  1.0
  Cs  Cs3  1  0.858  0.675  0.091  1.0
  Ti  Ti4  1  0.500  0.500  0.000  1.0
  Ti  Ti5  1  0.000  0.000  0.500  1.0
  Si  Si6  1  0.397  0.189  0.169  1.0
  Si  Si7  1  0.116  0.336  0.360  1.0
  Si  Si8  1  0.811  0.164  0.140  1.0
  Si  Si9  1  0.245  0.689  0.669  1.0
  Si  Si10  1  0.189  0.836  0.860  1.0
  Si  Si11  1  0.269  0.860  0.145  1.0
  Si  Si12  1  0.274  0.640  0.355  1.0
  Si  Si13  1  0.884  0.664  0.640  1.0
  Si  Si14  1  0.603  0.811  0.831  1.0
  Si  Si15  1  0.726  0.360  0.645  1.0
  Si  Si16  1  0.755  0.311  0.331  1.0
  Si  Si17  1  0.731  0.140  0.855  1.0
  O  O18  1  0.337  0.032  0.144  1.0
  O  O19  1  0.294  0.238  0.274  1.0
  O  O20  1  0.037  0.976  0.117  1.0
  O  O21  1  0.786  0.208  0.575  1.0
  O  O22  1  0.486  0.532  0.644  1.0
  O  O23  1  0.663  0.968  0.856  1.0
  O  O24  1  0.870  0.476  0.617  1.0
  O  O25  1  0.250  0.750  0.250  1.0
  O  O26  1  0.661  0.613  0.904  1.0
  O  O27  1  0.569  0.291  0.926  1.0
  O  O28  1  0.750  0.250  0.750  1.0
  O  O29  1  0.756  0.332  0.053  1.0
  O  O30  1  0.431  0.709  0.074  1.0
  O  O31  1  0.113  0.568  0.671  1.0
  O  O32  1  0.194  0.737  0.774  1.0
  O  O33  1  0.339  0.387  0.096  1.0
  O  O34  1  0.859  0.832  0.553  1.0
  O  O35  1  0.963  0.024  0.883  1.0
  O  O36  1  0.806  0.263  0.226  1.0
  O  O37  1  0.514  0.468  0.356  1.0
  O  O38  1  0.178  0.887  0.596  1.0
  O  O39  1  0.141  0.168  0.447  1.0
  O  O40  1  0.648  0.068  0.171  1.0
  O  O41  1  0.214  0.792  0.425  1.0
  O  O42  1  0.887  0.432  0.329  1.0
  O  O43  1  0.130  0.524  0.383  1.0
  O  O44  1  0.352  0.932  0.829  1.0
  O  O45  1  0.706  0.762  0.726  1.0
  O  O46  1  0.822  0.113  0.404  1.0
  O  O47  1  0.244  0.668  0.947  1.0
[/CIF]
.