The material described by RbNbO3 is Pb(Zr_(1-x)Ti_x)O3-like structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(3), and four equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(3) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the second Nb site, Nb(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form a mixture of corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 4°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Rb(1), one Nb(1), and two equivalent Nb(2) atoms to form edge-sharing ORbNb3 trigonal pyramids. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one Nb(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Nb(1), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Rb(1), one Nb(1), and one Nb(2) atom. is represented by the CIF file [CIF]
data_RbNbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.526
_cell_length_b   6.526
_cell_length_c   8.332
_cell_angle_alpha   86.596
_cell_angle_beta   86.596
_cell_angle_gamma   82.931
_symmetry_Int_Tables_number   1
_cell_volume   351.070
_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  0.663  0.663  0.764  1.0
  Rb  Rb1  1  0.766  0.234  0.500  1.0
  Rb  Rb2  1  0.234  0.766  0.500  1.0
  Rb  Rb3  1  0.337  0.337  0.236  1.0
  Nb  Nb4  1  0.742  0.742  0.196  1.0
  Nb  Nb5  1  0.811  0.189  0.000  1.0
  Nb  Nb6  1  0.189  0.811  0.000  1.0
  Nb  Nb7  1  0.258  0.258  0.804  1.0
  O  O8  1  0.877  0.877  0.948  1.0
  O  O9  1  0.671  0.671  0.407  1.0
  O  O10  1  0.952  0.287  0.789  1.0
  O  O11  1  0.287  0.952  0.789  1.0
  O  O12  1  0.453  0.773  0.102  1.0
  O  O13  1  0.773  0.453  0.102  1.0
  O  O14  1  0.547  0.227  0.898  1.0
  O  O15  1  0.227  0.547  0.898  1.0
  O  O16  1  0.048  0.713  0.211  1.0
  O  O17  1  0.713  0.048  0.211  1.0
  O  O18  1  0.329  0.329  0.593  1.0
  O  O19  1  0.123  0.123  0.052  1.0
[/CIF]
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The material described by RbNbO3 is Pb(Zr_(1-x)Ti_x)O3-like structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(3), and four equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(3) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the second Nb site, Nb(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form a mixture of corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 4°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Rb(1), one Nb(1), and two equivalent Nb(2) atoms to form edge-sharing ORbNb3 trigonal pyramids. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one Nb(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Nb(1), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Rb(1), one Nb(1), and one Nb(2) atom. is represented by the CIF file [CIF]
data_RbNbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.526
_cell_length_b   6.526
_cell_length_c   8.332
_cell_angle_alpha   86.596
_cell_angle_beta   86.596
_cell_angle_gamma   82.931
_symmetry_Int_Tables_number   1
_cell_volume   351.070
_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  0.663  0.663  0.764  1.0
  Rb  Rb1  1  0.766  0.234  0.500  1.0
  Rb  Rb2  1  0.234  0.766  0.500  1.0
  Rb  Rb3  1  0.337  0.337  0.236  1.0
  Nb  Nb4  1  0.742  0.742  0.196  1.0
  Nb  Nb5  1  0.811  0.189  0.000  1.0
  Nb  Nb6  1  0.189  0.811  0.000  1.0
  Nb  Nb7  1  0.258  0.258  0.804  1.0
  O  O8  1  0.877  0.877  0.948  1.0
  O  O9  1  0.671  0.671  0.407  1.0
  O  O10  1  0.952  0.287  0.789  1.0
  O  O11  1  0.287  0.952  0.789  1.0
  O  O12  1  0.453  0.773  0.102  1.0
  O  O13  1  0.773  0.453  0.102  1.0
  O  O14  1  0.547  0.227  0.898  1.0
  O  O15  1  0.227  0.547  0.898  1.0
  O  O16  1  0.048  0.713  0.211  1.0
  O  O17  1  0.713  0.048  0.211  1.0
  O  O18  1  0.329  0.329  0.593  1.0
  O  O19  1  0.123  0.123  0.052  1.0
[/CIF]
.