The material described by Rb3NaTiO4 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(1), one O(4), and three equivalent O(2) atoms. Na(1) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with four equivalent Ti(1)O4 tetrahedra and  an edgeedge with one Na(1)O4 tetrahedra. 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 Na(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(2), one Rb(3), two equivalent Rb(1), one Na(1), and one Ti(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(2), three equivalent Rb(3), and one Ti(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Rb(2), two equivalent Rb(1), two equivalent Na(1), and one Ti(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), one Na(1), and one Ti(1) atom. is represented by the CIF file [CIF]
data_Rb3NaTiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.501
_cell_length_b   10.885
_cell_length_c   11.014
_cell_angle_alpha   67.356
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   719.299
_cell_formula_units_Z   4
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  0.655  0.038  0.330  1.0
  Rb  Rb1  1  0.123  0.320  0.606  1.0
  Rb  Rb2  1  0.385  0.544  0.311  1.0
  Rb  Rb3  1  0.115  0.544  0.811  1.0
  Rb  Rb4  1  0.845  0.038  0.830  1.0
  Rb  Rb5  1  0.615  0.456  0.689  1.0
  Rb  Rb6  1  0.877  0.680  0.394  1.0
  Rb  Rb7  1  0.155  0.962  0.170  1.0
  Rb  Rb8  1  0.623  0.680  0.894  1.0
  Rb  Rb9  1  0.377  0.320  0.106  1.0
  Rb  Rb10  1  0.345  0.962  0.670  1.0
  Rb  Rb11  1  0.885  0.456  0.189  1.0
  Na  Na12  1  0.612  0.872  0.109  1.0
  Na  Na13  1  0.388  0.128  0.891  1.0
  Na  Na14  1  0.888  0.872  0.609  1.0
  Na  Na15  1  0.112  0.128  0.391  1.0
  Ti  Ti16  1  0.364  0.759  0.485  1.0
  Ti  Ti17  1  0.636  0.241  0.515  1.0
  Ti  Ti18  1  0.864  0.241  0.015  1.0
  Ti  Ti19  1  0.136  0.759  0.985  1.0
  O  O20  1  0.979  0.208  0.177  1.0
  O  O21  1  0.479  0.792  0.323  1.0
  O  O22  1  0.251  0.591  0.046  1.0
  O  O23  1  0.162  0.887  0.462  1.0
  O  O24  1  0.749  0.409  0.954  1.0
  O  O25  1  0.428  0.234  0.402  1.0
  O  O26  1  0.662  0.113  0.038  1.0
  O  O27  1  0.021  0.792  0.823  1.0
  O  O28  1  0.751  0.409  0.454  1.0
  O  O29  1  0.072  0.234  0.902  1.0
  O  O30  1  0.338  0.887  0.962  1.0
  O  O31  1  0.838  0.113  0.538  1.0
  O  O32  1  0.572  0.766  0.598  1.0
  O  O33  1  0.249  0.591  0.546  1.0
  O  O34  1  0.521  0.208  0.677  1.0
  O  O35  1  0.928  0.766  0.098  1.0
[/CIF]
.
The material described by Rb3NaTiO4 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(1), one O(4), and three equivalent O(2) atoms. Na(1) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with four equivalent Ti(1)O4 tetrahedra and  an edgeedge with one Na(1)O4 tetrahedra. 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 Na(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(2), one Rb(3), two equivalent Rb(1), one Na(1), and one Ti(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(2), three equivalent Rb(3), and one Ti(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Rb(2), two equivalent Rb(1), two equivalent Na(1), and one Ti(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), one Na(1), and one Ti(1) atom. is represented by the CIF file [CIF]
data_Rb3NaTiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.501
_cell_length_b   10.885
_cell_length_c   11.014
_cell_angle_alpha   67.356
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   719.299
_cell_formula_units_Z   4
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  0.655  0.038  0.330  1.0
  Rb  Rb1  1  0.123  0.320  0.606  1.0
  Rb  Rb2  1  0.385  0.544  0.311  1.0
  Rb  Rb3  1  0.115  0.544  0.811  1.0
  Rb  Rb4  1  0.845  0.038  0.830  1.0
  Rb  Rb5  1  0.615  0.456  0.689  1.0
  Rb  Rb6  1  0.877  0.680  0.394  1.0
  Rb  Rb7  1  0.155  0.962  0.170  1.0
  Rb  Rb8  1  0.623  0.680  0.894  1.0
  Rb  Rb9  1  0.377  0.320  0.106  1.0
  Rb  Rb10  1  0.345  0.962  0.670  1.0
  Rb  Rb11  1  0.885  0.456  0.189  1.0
  Na  Na12  1  0.612  0.872  0.109  1.0
  Na  Na13  1  0.388  0.128  0.891  1.0
  Na  Na14  1  0.888  0.872  0.609  1.0
  Na  Na15  1  0.112  0.128  0.391  1.0
  Ti  Ti16  1  0.364  0.759  0.485  1.0
  Ti  Ti17  1  0.636  0.241  0.515  1.0
  Ti  Ti18  1  0.864  0.241  0.015  1.0
  Ti  Ti19  1  0.136  0.759  0.985  1.0
  O  O20  1  0.979  0.208  0.177  1.0
  O  O21  1  0.479  0.792  0.323  1.0
  O  O22  1  0.251  0.591  0.046  1.0
  O  O23  1  0.162  0.887  0.462  1.0
  O  O24  1  0.749  0.409  0.954  1.0
  O  O25  1  0.428  0.234  0.402  1.0
  O  O26  1  0.662  0.113  0.038  1.0
  O  O27  1  0.021  0.792  0.823  1.0
  O  O28  1  0.751  0.409  0.454  1.0
  O  O29  1  0.072  0.234  0.902  1.0
  O  O30  1  0.338  0.887  0.962  1.0
  O  O31  1  0.838  0.113  0.538  1.0
  O  O32  1  0.572  0.766  0.598  1.0
  O  O33  1  0.249  0.591  0.546  1.0
  O  O34  1  0.521  0.208  0.677  1.0
  O  O35  1  0.928  0.766  0.098  1.0
[/CIF]
.