The compound described by RbNbO3 crystallizes in the triclinic P-1 space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. In the third Rb site, Rb(3) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(5), and three equivalent O(2) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and two equivalent O(6) atoms. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), and two equivalent O(6) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), one Rb(3), and one Nb(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(3), and one Nb(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(3), one Nb(1), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(2), one Rb(3), one Nb(1), and one Nb(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Rb(2), two equivalent Rb(3), one Nb(1), and one Nb(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Nb(1) and two equivalent Nb(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbNbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.146
_cell_length_b   8.472
_cell_length_c   8.992
_cell_angle_alpha   114.210
_cell_angle_beta   93.501
_cell_angle_gamma   94.760
_symmetry_Int_Tables_number   1
_cell_volume   354.335
_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  0.500  0.500  0.000  1.0
  Rb  Rb1  1  0.500  0.500  0.500  1.0
  Rb  Rb2  1  0.911  0.202  0.595  1.0
  Rb  Rb3  1  0.089  0.798  0.405  1.0
  Nb  Nb4  1  0.997  0.783  0.855  1.0
  Nb  Nb5  1  0.003  0.217  0.145  1.0
  Nb  Nb6  1  0.474  0.988  0.188  1.0
  Nb  Nb7  1  0.526  0.012  0.812  1.0
  O  O8  1  0.153  0.441  0.230  1.0
  O  O9  1  0.847  0.559  0.770  1.0
  O  O10  1  0.599  0.890  0.318  1.0
  O  O11  1  0.401  0.110  0.682  1.0
  O  O12  1  0.216  0.783  0.044  1.0
  O  O13  1  0.784  0.217  0.956  1.0
  O  O14  1  0.715  0.221  0.275  1.0
  O  O15  1  0.285  0.779  0.725  1.0
  O  O16  1  0.797  0.875  0.703  1.0
  O  O17  1  0.203  0.125  0.297  1.0
  O  O18  1  0.736  0.925  0.009  1.0
  O  O19  1  0.264  0.075  0.991  1.0
[/CIF]
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The compound described by RbNbO3 crystallizes in the triclinic P-1 space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. In the third Rb site, Rb(3) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(5), and three equivalent O(2) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and two equivalent O(6) atoms. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), and two equivalent O(6) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), one Rb(3), and one Nb(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(3), and one Nb(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(3), one Nb(1), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(2), one Rb(3), one Nb(1), and one Nb(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Rb(2), two equivalent Rb(3), one Nb(1), and one Nb(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Nb(1) and two equivalent Nb(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbNbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.146
_cell_length_b   8.472
_cell_length_c   8.992
_cell_angle_alpha   114.210
_cell_angle_beta   93.501
_cell_angle_gamma   94.760
_symmetry_Int_Tables_number   1
_cell_volume   354.335
_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  0.500  0.500  0.000  1.0
  Rb  Rb1  1  0.500  0.500  0.500  1.0
  Rb  Rb2  1  0.911  0.202  0.595  1.0
  Rb  Rb3  1  0.089  0.798  0.405  1.0
  Nb  Nb4  1  0.997  0.783  0.855  1.0
  Nb  Nb5  1  0.003  0.217  0.145  1.0
  Nb  Nb6  1  0.474  0.988  0.188  1.0
  Nb  Nb7  1  0.526  0.012  0.812  1.0
  O  O8  1  0.153  0.441  0.230  1.0
  O  O9  1  0.847  0.559  0.770  1.0
  O  O10  1  0.599  0.890  0.318  1.0
  O  O11  1  0.401  0.110  0.682  1.0
  O  O12  1  0.216  0.783  0.044  1.0
  O  O13  1  0.784  0.217  0.956  1.0
  O  O14  1  0.715  0.221  0.275  1.0
  O  O15  1  0.285  0.779  0.725  1.0
  O  O16  1  0.797  0.875  0.703  1.0
  O  O17  1  0.203  0.125  0.297  1.0
  O  O18  1  0.736  0.925  0.009  1.0
  O  O19  1  0.264  0.075  0.991  1.0
[/CIF]
.