The crystal structure described by Rb3TmO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted RbO4 tetrahedra that share corners with five equivalent Tm(1)O4 tetrahedra and  an edgeedge with one Rb(1)O4 tetrahedra. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. Tm(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form TmO4 tetrahedra that share corners with five equivalent Rb(1)O4 tetrahedra and  an edgeedge with one Tm(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one Tm(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and two equivalent Tm(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and one Tm(1) atom. is represented by the CIF file [CIF]
data_Rb3TmO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.266
_cell_length_b   7.758
_cell_length_c   11.586
_cell_angle_alpha   86.161
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   651.584
_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  0.335  0.360  0.079  1.0
  Rb  Rb1  1  0.624  0.929  0.157  1.0
  Rb  Rb2  1  0.803  0.374  0.190  1.0
  Rb  Rb3  1  0.303  0.626  0.310  1.0
  Rb  Rb4  1  0.124  0.071  0.343  1.0
  Rb  Rb5  1  0.835  0.640  0.421  1.0
  Rb  Rb6  1  0.165  0.360  0.579  1.0
  Rb  Rb7  1  0.876  0.929  0.657  1.0
  Rb  Rb8  1  0.697  0.374  0.690  1.0
  Rb  Rb9  1  0.197  0.626  0.810  1.0
  Rb  Rb10  1  0.376  0.071  0.843  1.0
  Rb  Rb11  1  0.665  0.640  0.921  1.0
  Tm  Tm12  1  0.089  0.840  0.068  1.0
  Tm  Tm13  1  0.589  0.160  0.432  1.0
  Tm  Tm14  1  0.411  0.840  0.568  1.0
  Tm  Tm15  1  0.911  0.160  0.932  1.0
  O  O16  1  0.353  0.745  0.046  1.0
  O  O17  1  0.050  0.110  0.094  1.0
  O  O18  1  0.943  0.695  0.192  1.0
  O  O19  1  0.443  0.305  0.308  1.0
  O  O20  1  0.550  0.890  0.406  1.0
  O  O21  1  0.853  0.255  0.454  1.0
  O  O22  1  0.147  0.745  0.546  1.0
  O  O23  1  0.450  0.110  0.594  1.0
  O  O24  1  0.557  0.695  0.692  1.0
  O  O25  1  0.057  0.305  0.808  1.0
  O  O26  1  0.950  0.890  0.906  1.0
  O  O27  1  0.647  0.255  0.954  1.0
[/CIF]
.
The crystal structure described by Rb3TmO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted RbO4 tetrahedra that share corners with five equivalent Tm(1)O4 tetrahedra and  an edgeedge with one Rb(1)O4 tetrahedra. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. Tm(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form TmO4 tetrahedra that share corners with five equivalent Rb(1)O4 tetrahedra and  an edgeedge with one Tm(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one Tm(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and two equivalent Tm(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and one Tm(1) atom. is represented by the CIF file [CIF]
data_Rb3TmO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.266
_cell_length_b   7.758
_cell_length_c   11.586
_cell_angle_alpha   86.161
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   651.584
_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  0.335  0.360  0.079  1.0
  Rb  Rb1  1  0.624  0.929  0.157  1.0
  Rb  Rb2  1  0.803  0.374  0.190  1.0
  Rb  Rb3  1  0.303  0.626  0.310  1.0
  Rb  Rb4  1  0.124  0.071  0.343  1.0
  Rb  Rb5  1  0.835  0.640  0.421  1.0
  Rb  Rb6  1  0.165  0.360  0.579  1.0
  Rb  Rb7  1  0.876  0.929  0.657  1.0
  Rb  Rb8  1  0.697  0.374  0.690  1.0
  Rb  Rb9  1  0.197  0.626  0.810  1.0
  Rb  Rb10  1  0.376  0.071  0.843  1.0
  Rb  Rb11  1  0.665  0.640  0.921  1.0
  Tm  Tm12  1  0.089  0.840  0.068  1.0
  Tm  Tm13  1  0.589  0.160  0.432  1.0
  Tm  Tm14  1  0.411  0.840  0.568  1.0
  Tm  Tm15  1  0.911  0.160  0.932  1.0
  O  O16  1  0.353  0.745  0.046  1.0
  O  O17  1  0.050  0.110  0.094  1.0
  O  O18  1  0.943  0.695  0.192  1.0
  O  O19  1  0.443  0.305  0.308  1.0
  O  O20  1  0.550  0.890  0.406  1.0
  O  O21  1  0.853  0.255  0.454  1.0
  O  O22  1  0.147  0.745  0.546  1.0
  O  O23  1  0.450  0.110  0.594  1.0
  O  O24  1  0.557  0.695  0.692  1.0
  O  O25  1  0.057  0.305  0.808  1.0
  O  O26  1  0.950  0.890  0.906  1.0
  O  O27  1  0.647  0.255  0.954  1.0
[/CIF]
.