The structure described by Na2TbO3 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Tb(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with five equivalent Na(2)O6 octahedra, and edges with five equivalent Tb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the second Na site, Na(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Tb(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with five equivalent Na(1)O6 octahedra, and edges with five equivalent Tb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-14°. Tb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form TbO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Tb(1)O6 octahedra, edges with two equivalent Tb(1)O6 octahedra, edges with five equivalent Na(1)O6 octahedra, and edges with five equivalent Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Tb(1) atoms to form a mixture of edge and corner-sharing ONa4Tb2 octahedra. The corner-sharing octahedral tilt angles range from 4-13°. In the second O site, O(2) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Tb(1) atoms to form a mixture of edge and corner-sharing ONa4Tb2 octahedra. The corner-sharing octahedral tilt angles range from 2-7°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2TbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.906
_cell_length_b   5.906
_cell_length_c   5.917
_cell_angle_alpha   79.269
_cell_angle_beta   79.269
_cell_angle_gamma   118.563
_symmetry_Int_Tables_number   1
_cell_volume   168.803
_cell_formula_units_Z   2
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
  Na  Na0  1  0.920  0.080  0.750  1.0
  Na  Na1  1  0.246  0.754  0.750  1.0
  Na  Na2  1  0.080  0.920  0.250  1.0
  Na  Na3  1  0.754  0.246  0.250  1.0
  Tb  Tb4  1  0.595  0.405  0.750  1.0
  Tb  Tb5  1  0.405  0.595  0.250  1.0
  O  O6  1  0.645  0.785  0.492  1.0
  O  O7  1  0.355  0.215  0.508  1.0
  O  O8  1  0.215  0.355  0.008  1.0
  O  O9  1  0.000  0.500  0.500  1.0
  O  O10  1  0.785  0.645  0.992  1.0
  O  O11  1  0.500  0.000  0.000  1.0
[/CIF]
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The structure described by Na2TbO3 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Tb(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with five equivalent Na(2)O6 octahedra, and edges with five equivalent Tb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the second Na site, Na(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Tb(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with five equivalent Na(1)O6 octahedra, and edges with five equivalent Tb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-14°. Tb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form TbO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Tb(1)O6 octahedra, edges with two equivalent Tb(1)O6 octahedra, edges with five equivalent Na(1)O6 octahedra, and edges with five equivalent Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Tb(1) atoms to form a mixture of edge and corner-sharing ONa4Tb2 octahedra. The corner-sharing octahedral tilt angles range from 4-13°. In the second O site, O(2) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Tb(1) atoms to form a mixture of edge and corner-sharing ONa4Tb2 octahedra. The corner-sharing octahedral tilt angles range from 2-7°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2TbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.906
_cell_length_b   5.906
_cell_length_c   5.917
_cell_angle_alpha   79.269
_cell_angle_beta   79.269
_cell_angle_gamma   118.563
_symmetry_Int_Tables_number   1
_cell_volume   168.803
_cell_formula_units_Z   2
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
  Na  Na0  1  0.920  0.080  0.750  1.0
  Na  Na1  1  0.246  0.754  0.750  1.0
  Na  Na2  1  0.080  0.920  0.250  1.0
  Na  Na3  1  0.754  0.246  0.250  1.0
  Tb  Tb4  1  0.595  0.405  0.750  1.0
  Tb  Tb5  1  0.405  0.595  0.250  1.0
  O  O6  1  0.645  0.785  0.492  1.0
  O  O7  1  0.355  0.215  0.508  1.0
  O  O8  1  0.215  0.355  0.008  1.0
  O  O9  1  0.000  0.500  0.500  1.0
  O  O10  1  0.785  0.645  0.992  1.0
  O  O11  1  0.500  0.000  0.000  1.0
[/CIF]
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