The material structure described by Rb4TiO4 crystallizes in the triclinic P-1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted RbO4 tetrahedra that share corners with four equivalent Ti(1)O4 tetrahedra, corners with two equivalent Rb(2)O5 trigonal bipyramids, and edges with two equivalent Rb(1)O4 tetrahedra. In the second Rb site, Rb(2) is bonded to one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted RbO5 trigonal bipyramids that share corners with two equivalent Rb(1)O4 tetrahedra, corners with three equivalent Ti(1)O4 tetrahedra,  an edgeedge with one Ti(1)O4 tetrahedra, and edges with two equivalent Rb(2)O5 trigonal bipyramids. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. In the fourth Rb site, Rb(4) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. Ti(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form TiO4 tetrahedra that share corners with four equivalent Rb(1)O4 tetrahedra, corners with three equivalent Rb(2)O5 trigonal bipyramids, and  an edgeedge with one Rb(2)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Rb(4), two equivalent Rb(1), two equivalent Rb(3), and one Ti(1) atom. In the second O site, O(2) is bonded to one Rb(3), two equivalent Rb(2), two equivalent Rb(4), and one Ti(1) atom to form distorted edge-sharing ORb5Ti octahedra. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(2), one Rb(3), one Rb(4), two equivalent Rb(1), and one Ti(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Rb(3), two equivalent Rb(2), two equivalent Rb(4), and one Ti(1) atom. is represented by the CIF file [CIF]
data_Rb4TiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.674
_cell_length_b   6.711
_cell_length_c   9.950
_cell_angle_alpha   71.737
_cell_angle_beta   79.083
_cell_angle_gamma   66.139
_symmetry_Int_Tables_number   1
_cell_volume   386.012
_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
  Rb  Rb0  1  0.240  0.767  0.033  1.0
  Rb  Rb1  1  0.280  0.509  0.438  1.0
  Rb  Rb2  1  0.254  0.409  0.842  1.0
  Rb  Rb3  1  0.214  0.968  0.624  1.0
  Rb  Rb4  1  0.786  0.032  0.376  1.0
  Rb  Rb5  1  0.746  0.591  0.158  1.0
  Rb  Rb6  1  0.720  0.491  0.562  1.0
  Rb  Rb7  1  0.760  0.233  0.967  1.0
  Ti  Ti8  1  0.269  0.159  0.248  1.0
  Ti  Ti9  1  0.731  0.841  0.752  1.0
  O  O10  1  0.128  0.166  0.105  1.0
  O  O11  1  0.050  0.295  0.370  1.0
  O  O12  1  0.446  0.326  0.188  1.0
  O  O13  1  0.565  0.130  0.655  1.0
  O  O14  1  0.435  0.870  0.345  1.0
  O  O15  1  0.554  0.674  0.812  1.0
  O  O16  1  0.950  0.705  0.630  1.0
  O  O17  1  0.872  0.834  0.895  1.0
[/CIF]
.
The material structure described by Rb4TiO4 crystallizes in the triclinic P-1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted RbO4 tetrahedra that share corners with four equivalent Ti(1)O4 tetrahedra, corners with two equivalent Rb(2)O5 trigonal bipyramids, and edges with two equivalent Rb(1)O4 tetrahedra. In the second Rb site, Rb(2) is bonded to one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted RbO5 trigonal bipyramids that share corners with two equivalent Rb(1)O4 tetrahedra, corners with three equivalent Ti(1)O4 tetrahedra,  an edgeedge with one Ti(1)O4 tetrahedra, and edges with two equivalent Rb(2)O5 trigonal bipyramids. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. In the fourth Rb site, Rb(4) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. Ti(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form TiO4 tetrahedra that share corners with four equivalent Rb(1)O4 tetrahedra, corners with three equivalent Rb(2)O5 trigonal bipyramids, and  an edgeedge with one Rb(2)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Rb(4), two equivalent Rb(1), two equivalent Rb(3), and one Ti(1) atom. In the second O site, O(2) is bonded to one Rb(3), two equivalent Rb(2), two equivalent Rb(4), and one Ti(1) atom to form distorted edge-sharing ORb5Ti octahedra. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(2), one Rb(3), one Rb(4), two equivalent Rb(1), and one Ti(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Rb(3), two equivalent Rb(2), two equivalent Rb(4), and one Ti(1) atom. is represented by the CIF file [CIF]
data_Rb4TiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.674
_cell_length_b   6.711
_cell_length_c   9.950
_cell_angle_alpha   71.737
_cell_angle_beta   79.083
_cell_angle_gamma   66.139
_symmetry_Int_Tables_number   1
_cell_volume   386.012
_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
  Rb  Rb0  1  0.240  0.767  0.033  1.0
  Rb  Rb1  1  0.280  0.509  0.438  1.0
  Rb  Rb2  1  0.254  0.409  0.842  1.0
  Rb  Rb3  1  0.214  0.968  0.624  1.0
  Rb  Rb4  1  0.786  0.032  0.376  1.0
  Rb  Rb5  1  0.746  0.591  0.158  1.0
  Rb  Rb6  1  0.720  0.491  0.562  1.0
  Rb  Rb7  1  0.760  0.233  0.967  1.0
  Ti  Ti8  1  0.269  0.159  0.248  1.0
  Ti  Ti9  1  0.731  0.841  0.752  1.0
  O  O10  1  0.128  0.166  0.105  1.0
  O  O11  1  0.050  0.295  0.370  1.0
  O  O12  1  0.446  0.326  0.188  1.0
  O  O13  1  0.565  0.130  0.655  1.0
  O  O14  1  0.435  0.870  0.345  1.0
  O  O15  1  0.554  0.674  0.812  1.0
  O  O16  1  0.950  0.705  0.630  1.0
  O  O17  1  0.872  0.834  0.895  1.0
[/CIF]
.