The structure described by RbNa3Li12Ti4O16 crystallizes in the tetragonal I4/m space group. Rb(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with four equivalent Ti(1)O4 tetrahedra, corners with four equivalent Li(2)O4 trigonal pyramids, and edges with two equivalent Li(2)O4 trigonal pyramids. In the second Li site, Li(2) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Ti(1)O4 tetrahedra, corners with four equivalent Li(2)O4 trigonal pyramids,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Ti(1)O4 tetrahedra. Ti(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form TiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 trigonal pyramids, and edges with two equivalent Li(2)O4 trigonal pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(2), one Li(1), two equivalent Li(2), and one Ti(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), one Na(1), one Li(1), two equivalent Li(2), and one Ti(1) atom. In the third O site, O(3) is bonded to two equivalent Na(2), one Li(1), two equivalent Li(2), and one Ti(1) atom to form a mixture of distorted corner and edge-sharing ONa2Li3Ti octahedra. The corner-sharing octahedral tilt angles are 67°. is represented by the CIF file [CIF]
data_RbNa3Li12Ti4O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.544
_cell_length_b   8.544
_cell_length_c   8.544
_cell_angle_alpha   98.272
_cell_angle_beta   98.272
_cell_angle_gamma   135.418
_symmetry_Int_Tables_number   1
_cell_volume   405.080
_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
  Rb  Rb0  1  0.000  0.000  0.000  1.0
  Na  Na1  1  0.500  0.500  0.000  1.0
  Na  Na2  1  0.750  0.250  0.500  1.0
  Na  Na3  1  0.250  0.750  0.500  1.0
  Li  Li4  1  0.082  0.279  0.360  1.0
  Li  Li5  1  0.849  0.525  0.867  1.0
  Li  Li6  1  0.342  0.018  0.867  1.0
  Li  Li7  1  0.721  0.082  0.803  1.0
  Li  Li8  1  0.982  0.849  0.324  1.0
  Li  Li9  1  0.475  0.342  0.324  1.0
  Li  Li10  1  0.525  0.658  0.676  1.0
  Li  Li11  1  0.018  0.151  0.676  1.0
  Li  Li12  1  0.279  0.918  0.197  1.0
  Li  Li13  1  0.151  0.475  0.133  1.0
  Li  Li14  1  0.658  0.982  0.133  1.0
  Li  Li15  1  0.918  0.721  0.640  1.0
  Ti  Ti16  1  0.419  0.222  0.641  1.0
  Ti  Ti17  1  0.222  0.581  0.804  1.0
  Ti  Ti18  1  0.778  0.419  0.196  1.0
  Ti  Ti19  1  0.581  0.778  0.359  1.0
  O  O20  1  0.322  0.091  0.413  1.0
  O  O21  1  0.647  0.546  0.726  1.0
  O  O22  1  0.180  0.079  0.726  1.0
  O  O23  1  0.572  0.168  0.741  1.0
  O  O24  1  0.091  0.678  0.769  1.0
  O  O25  1  0.168  0.428  0.596  1.0
  O  O26  1  0.921  0.647  0.101  1.0
  O  O27  1  0.454  0.180  0.101  1.0
  O  O28  1  0.079  0.353  0.899  1.0
  O  O29  1  0.546  0.820  0.899  1.0
  O  O30  1  0.832  0.572  0.404  1.0
  O  O31  1  0.909  0.322  0.231  1.0
  O  O32  1  0.428  0.832  0.259  1.0
  O  O33  1  0.820  0.921  0.274  1.0
  O  O34  1  0.353  0.454  0.274  1.0
  O  O35  1  0.678  0.909  0.587  1.0
[/CIF]
.
The structure described by RbNa3Li12Ti4O16 crystallizes in the tetragonal I4/m space group. Rb(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with four equivalent Ti(1)O4 tetrahedra, corners with four equivalent Li(2)O4 trigonal pyramids, and edges with two equivalent Li(2)O4 trigonal pyramids. In the second Li site, Li(2) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Ti(1)O4 tetrahedra, corners with four equivalent Li(2)O4 trigonal pyramids,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Ti(1)O4 tetrahedra. Ti(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form TiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 trigonal pyramids, and edges with two equivalent Li(2)O4 trigonal pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(2), one Li(1), two equivalent Li(2), and one Ti(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), one Na(1), one Li(1), two equivalent Li(2), and one Ti(1) atom. In the third O site, O(3) is bonded to two equivalent Na(2), one Li(1), two equivalent Li(2), and one Ti(1) atom to form a mixture of distorted corner and edge-sharing ONa2Li3Ti octahedra. The corner-sharing octahedral tilt angles are 67°. is represented by the CIF file [CIF]
data_RbNa3Li12Ti4O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.544
_cell_length_b   8.544
_cell_length_c   8.544
_cell_angle_alpha   98.272
_cell_angle_beta   98.272
_cell_angle_gamma   135.418
_symmetry_Int_Tables_number   1
_cell_volume   405.080
_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
  Rb  Rb0  1  0.000  0.000  0.000  1.0
  Na  Na1  1  0.500  0.500  0.000  1.0
  Na  Na2  1  0.750  0.250  0.500  1.0
  Na  Na3  1  0.250  0.750  0.500  1.0
  Li  Li4  1  0.082  0.279  0.360  1.0
  Li  Li5  1  0.849  0.525  0.867  1.0
  Li  Li6  1  0.342  0.018  0.867  1.0
  Li  Li7  1  0.721  0.082  0.803  1.0
  Li  Li8  1  0.982  0.849  0.324  1.0
  Li  Li9  1  0.475  0.342  0.324  1.0
  Li  Li10  1  0.525  0.658  0.676  1.0
  Li  Li11  1  0.018  0.151  0.676  1.0
  Li  Li12  1  0.279  0.918  0.197  1.0
  Li  Li13  1  0.151  0.475  0.133  1.0
  Li  Li14  1  0.658  0.982  0.133  1.0
  Li  Li15  1  0.918  0.721  0.640  1.0
  Ti  Ti16  1  0.419  0.222  0.641  1.0
  Ti  Ti17  1  0.222  0.581  0.804  1.0
  Ti  Ti18  1  0.778  0.419  0.196  1.0
  Ti  Ti19  1  0.581  0.778  0.359  1.0
  O  O20  1  0.322  0.091  0.413  1.0
  O  O21  1  0.647  0.546  0.726  1.0
  O  O22  1  0.180  0.079  0.726  1.0
  O  O23  1  0.572  0.168  0.741  1.0
  O  O24  1  0.091  0.678  0.769  1.0
  O  O25  1  0.168  0.428  0.596  1.0
  O  O26  1  0.921  0.647  0.101  1.0
  O  O27  1  0.454  0.180  0.101  1.0
  O  O28  1  0.079  0.353  0.899  1.0
  O  O29  1  0.546  0.820  0.899  1.0
  O  O30  1  0.832  0.572  0.404  1.0
  O  O31  1  0.909  0.322  0.231  1.0
  O  O32  1  0.428  0.832  0.259  1.0
  O  O33  1  0.820  0.921  0.274  1.0
  O  O34  1  0.353  0.454  0.274  1.0
  O  O35  1  0.678  0.909  0.587  1.0
[/CIF]
.