The structure described by Na2Sb4O11 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 2-coordinate geometry to one O(3) and one O(8) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(10), one O(4), one O(5), one O(6), and one O(9) atom. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(3), one O(4), one O(7), and two equivalent O(1) atoms to form a mixture of edge and corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the second Sb site, Sb(2) is bonded to one O(1), one O(11), one O(12), one O(4), one O(5), and one O(6) atom to form a mixture of edge and corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the third Sb site, Sb(3) is bonded to one O(10), one O(2), one O(5), one O(7), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 33-48°. In the fourth Sb site, Sb(4) is bonded to one O(10), one O(3), one O(6), one O(7), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 33-48°. There are twelve inequivalent O sites. In the first O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Sb(3), and one Sb(4) atom. In the second O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Sb(3), and one Sb(4) atom. In the third O site, O(11) is bonded in an L-shaped geometry to two equivalent Sb(2) atoms. In the fourth O site, O(12) is bonded in an L-shaped geometry to two equivalent Sb(2) atoms. In the fifth O site, O(1) is bonded in a trigonal planar geometry to one Sb(2) and two equivalent Sb(1) atoms. In the sixth O site, O(2) is bonded in a water-like geometry to one Sb(1) and one Sb(3) atom. In the seventh O site, O(3) is bonded in a 2-coordinate geometry to one Na(1), one Sb(1), and one Sb(4) atom. In the eighth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Sb(1), and one Sb(2) atom. In the ninth O site, O(5) is bonded in a 3-coordinate geometry to one Na(2), one Sb(2), and one Sb(3) atom. In the tenth O site, O(6) is bonded in a 3-coordinate geometry to one Na(2), one Sb(2), and one Sb(4) atom. In the eleventh O site, O(7) is bonded in a distorted T-shaped geometry to one Sb(1), one Sb(3), and one Sb(4) atom. In the twelfth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Sb(3), and one Sb(4) atom. is represented by the CIF file [CIF]
data_Na2Sb4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.589
_cell_length_b   10.589
_cell_length_c   7.268
_cell_angle_alpha   85.043
_cell_angle_beta   85.043
_cell_angle_gamma   42.322
_symmetry_Int_Tables_number   1
_cell_volume   546.363
_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  0.991  0.958  0.781  1.0
  Na  Na1  1  0.266  0.262  0.563  1.0
  Na  Na2  1  0.738  0.734  0.437  1.0
  Na  Na3  1  0.042  0.009  0.219  1.0
  Sb  Sb4  1  0.427  0.424  0.114  1.0
  Sb  Sb5  1  0.431  0.430  0.593  1.0
  Sb  Sb6  1  0.588  0.068  0.931  1.0
  Sb  Sb7  1  0.070  0.585  0.932  1.0
  Sb  Sb8  1  0.415  0.930  0.068  1.0
  Sb  Sb9  1  0.932  0.412  0.069  1.0
  Sb  Sb10  1  0.570  0.569  0.407  1.0
  Sb  Sb11  1  0.576  0.573  0.886  1.0
  O  O12  1  0.480  0.477  0.840  1.0
  O  O13  1  0.673  0.157  0.062  1.0
  O  O14  1  0.160  0.671  0.062  1.0
  O  O15  1  0.382  0.382  0.365  1.0
  O  O16  1  0.563  0.176  0.681  1.0
  O  O17  1  0.177  0.565  0.682  1.0
  O  O18  1  0.335  0.333  0.009  1.0
  O  O19  1  0.849  0.846  0.848  1.0
  O  O20  1  0.972  0.558  0.164  1.0
  O  O21  1  0.560  0.971  0.164  1.0
  O  O22  1  0.029  0.440  0.836  1.0
  O  O23  1  0.442  0.028  0.836  1.0
  O  O24  1  0.154  0.151  0.152  1.0
  O  O25  1  0.667  0.665  0.991  1.0
  O  O26  1  0.435  0.823  0.318  1.0
  O  O27  1  0.824  0.437  0.319  1.0
  O  O28  1  0.618  0.618  0.635  1.0
  O  O29  1  0.843  0.327  0.938  1.0
  O  O30  1  0.329  0.840  0.938  1.0
  O  O31  1  0.523  0.520  0.160  1.0
  O  O32  1  0.675  0.325  0.500  1.0
  O  O33  1  0.326  0.674  0.500  1.0
[/CIF]
.
The structure described by Na2Sb4O11 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 2-coordinate geometry to one O(3) and one O(8) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(10), one O(4), one O(5), one O(6), and one O(9) atom. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(3), one O(4), one O(7), and two equivalent O(1) atoms to form a mixture of edge and corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the second Sb site, Sb(2) is bonded to one O(1), one O(11), one O(12), one O(4), one O(5), and one O(6) atom to form a mixture of edge and corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the third Sb site, Sb(3) is bonded to one O(10), one O(2), one O(5), one O(7), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 33-48°. In the fourth Sb site, Sb(4) is bonded to one O(10), one O(3), one O(6), one O(7), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 33-48°. There are twelve inequivalent O sites. In the first O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Sb(3), and one Sb(4) atom. In the second O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Sb(3), and one Sb(4) atom. In the third O site, O(11) is bonded in an L-shaped geometry to two equivalent Sb(2) atoms. In the fourth O site, O(12) is bonded in an L-shaped geometry to two equivalent Sb(2) atoms. In the fifth O site, O(1) is bonded in a trigonal planar geometry to one Sb(2) and two equivalent Sb(1) atoms. In the sixth O site, O(2) is bonded in a water-like geometry to one Sb(1) and one Sb(3) atom. In the seventh O site, O(3) is bonded in a 2-coordinate geometry to one Na(1), one Sb(1), and one Sb(4) atom. In the eighth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Sb(1), and one Sb(2) atom. In the ninth O site, O(5) is bonded in a 3-coordinate geometry to one Na(2), one Sb(2), and one Sb(3) atom. In the tenth O site, O(6) is bonded in a 3-coordinate geometry to one Na(2), one Sb(2), and one Sb(4) atom. In the eleventh O site, O(7) is bonded in a distorted T-shaped geometry to one Sb(1), one Sb(3), and one Sb(4) atom. In the twelfth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Sb(3), and one Sb(4) atom. is represented by the CIF file [CIF]
data_Na2Sb4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.589
_cell_length_b   10.589
_cell_length_c   7.268
_cell_angle_alpha   85.043
_cell_angle_beta   85.043
_cell_angle_gamma   42.322
_symmetry_Int_Tables_number   1
_cell_volume   546.363
_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  0.991  0.958  0.781  1.0
  Na  Na1  1  0.266  0.262  0.563  1.0
  Na  Na2  1  0.738  0.734  0.437  1.0
  Na  Na3  1  0.042  0.009  0.219  1.0
  Sb  Sb4  1  0.427  0.424  0.114  1.0
  Sb  Sb5  1  0.431  0.430  0.593  1.0
  Sb  Sb6  1  0.588  0.068  0.931  1.0
  Sb  Sb7  1  0.070  0.585  0.932  1.0
  Sb  Sb8  1  0.415  0.930  0.068  1.0
  Sb  Sb9  1  0.932  0.412  0.069  1.0
  Sb  Sb10  1  0.570  0.569  0.407  1.0
  Sb  Sb11  1  0.576  0.573  0.886  1.0
  O  O12  1  0.480  0.477  0.840  1.0
  O  O13  1  0.673  0.157  0.062  1.0
  O  O14  1  0.160  0.671  0.062  1.0
  O  O15  1  0.382  0.382  0.365  1.0
  O  O16  1  0.563  0.176  0.681  1.0
  O  O17  1  0.177  0.565  0.682  1.0
  O  O18  1  0.335  0.333  0.009  1.0
  O  O19  1  0.849  0.846  0.848  1.0
  O  O20  1  0.972  0.558  0.164  1.0
  O  O21  1  0.560  0.971  0.164  1.0
  O  O22  1  0.029  0.440  0.836  1.0
  O  O23  1  0.442  0.028  0.836  1.0
  O  O24  1  0.154  0.151  0.152  1.0
  O  O25  1  0.667  0.665  0.991  1.0
  O  O26  1  0.435  0.823  0.318  1.0
  O  O27  1  0.824  0.437  0.319  1.0
  O  O28  1  0.618  0.618  0.635  1.0
  O  O29  1  0.843  0.327  0.938  1.0
  O  O30  1  0.329  0.840  0.938  1.0
  O  O31  1  0.523  0.520  0.160  1.0
  O  O32  1  0.675  0.325  0.500  1.0
  O  O33  1  0.326  0.674  0.500  1.0
[/CIF]
.