The structure described by Ba4Na2W2O11 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms to form NaO6 octahedra that share corners with four equivalent W(2)O6 octahedra and corners with two equivalent W(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-3°. In the second Na site, Na(2) is bonded to one O(6), two equivalent O(4), and two equivalent O(7) atoms to form distorted NaO5 square pyramids that share corners with two equivalent W(2)O6 octahedra and corners with three equivalent W(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 10°. Ba(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(6), one O(7), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(6), two equivalent O(5), and two equivalent O(7) atoms to form WO5 trigonal bipyramids that share corners with two equivalent Na(1)O6 octahedra and corners with three equivalent Na(2)O5 square pyramids. The corner-sharing octahedral tilt angles are 7°. In the second W site, W(2) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form WO6 octahedra that share corners with four equivalent Na(1)O6 octahedra and corners with two equivalent Na(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-3°. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), four equivalent Ba(1), and one W(2) atom to form distorted OBa4NaW octahedra that share corners with two equivalent O(2)Ba4NaW octahedra, corners with four equivalent O(4)Ba4NaW octahedra, corners with four equivalent O(7)Ba2NaW trigonal pyramids, edges with two equivalent O(2)Ba4NaW octahedra, faces with two equivalent O(4)Ba4NaW octahedra, and faces with four equivalent O(3)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the second O site, O(2) is bonded to one Na(1), four equivalent Ba(1), and one W(2) atom to form distorted OBa4NaW octahedra that share corners with two equivalent O(1)Ba4NaW octahedra, corners with four equivalent O(4)Ba4NaW octahedra, corners with four equivalent O(7)Ba2NaW trigonal pyramids, edges with two equivalent O(1)Ba4NaW octahedra, faces with two equivalent O(4)Ba4NaW octahedra, and faces with four equivalent O(3)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the third O site, O(3) is bonded to one Na(1), four equivalent Ba(1), and one W(2) atom to form distorted OBa4NaW octahedra that share corners with two equivalent O(3)Ba4NaW octahedra, corners with four equivalent O(4)Ba4NaW octahedra, corners with four equivalent O(7)Ba2NaW trigonal pyramids, edges with two equivalent O(3)Ba4NaW octahedra, faces with two equivalent O(1)Ba4NaW octahedra, faces with two equivalent O(2)Ba4NaW octahedra, and faces with two equivalent O(4)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 1-55°. In the fourth O site, O(4) is bonded to one Na(2), four equivalent Ba(1), and one W(2) atom to form distorted OBa4NaW octahedra that share corners with two equivalent O(1)Ba4NaW octahedra, corners with two equivalent O(2)Ba4NaW octahedra, corners with four equivalent O(3)Ba4NaW octahedra, corners with six equivalent O(4)Ba4NaW octahedra, corners with two equivalent O(7)Ba2NaW trigonal pyramids, edges with two equivalent O(7)Ba2NaW trigonal pyramids,  a faceface with one O(1)Ba4NaW octahedra,  a faceface with one O(2)Ba4NaW octahedra, and faces with two equivalent O(3)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 2-56°. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Na(1), four equivalent Ba(1), and one W(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Na(2), four equivalent Ba(1), and one W(1) atom. In the seventh O site, O(7) is bonded to one Na(2), two equivalent Ba(1), and one W(1) atom to form distorted OBa2NaW trigonal pyramids that share corners with two equivalent O(1)Ba4NaW octahedra, corners with two equivalent O(2)Ba4NaW octahedra, corners with two equivalent O(4)Ba4NaW octahedra, corners with four equivalent O(3)Ba4NaW octahedra, corners with two equivalent O(7)Ba2NaW trigonal pyramids, and edges with two equivalent O(4)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 28-81°. is represented by the CIF file [CIF]
data_Ba4Na2W2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.007
_cell_length_b   6.007
_cell_length_c   8.710
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   91.135
_symmetry_Int_Tables_number   1
_cell_volume   314.197
_cell_formula_units_Z   1
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
  Ba  Ba0  1  0.022  0.476  0.279  1.0
  Ba  Ba1  1  0.022  0.476  0.721  1.0
  Ba  Ba2  1  0.524  0.978  0.279  1.0
  Ba  Ba3  1  0.524  0.978  0.721  1.0
  Na  Na4  1  0.516  0.484  0.500  1.0
  Na  Na5  1  0.979  0.021  0.000  1.0
  W  W6  1  0.501  0.499  0.000  1.0
  W  W7  1  0.020  0.980  0.500  1.0
  O  O8  1  0.246  0.754  0.500  1.0
  O  O9  1  0.789  0.211  0.500  1.0
  O  O10  1  0.782  0.756  0.500  1.0
  O  O11  1  0.244  0.218  0.500  1.0
  O  O12  1  0.023  0.977  0.271  1.0
  O  O13  1  0.023  0.977  0.729  1.0
  O  O14  1  0.493  0.507  0.777  1.0
  O  O15  1  0.493  0.507  0.223  1.0
  O  O16  1  0.717  0.283  0.000  1.0
  O  O17  1  0.597  0.801  0.000  1.0
  O  O18  1  0.199  0.403  0.000  1.0
[/CIF]
.
The structure described by Ba4Na2W2O11 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms to form NaO6 octahedra that share corners with four equivalent W(2)O6 octahedra and corners with two equivalent W(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-3°. In the second Na site, Na(2) is bonded to one O(6), two equivalent O(4), and two equivalent O(7) atoms to form distorted NaO5 square pyramids that share corners with two equivalent W(2)O6 octahedra and corners with three equivalent W(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 10°. Ba(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(6), one O(7), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(6), two equivalent O(5), and two equivalent O(7) atoms to form WO5 trigonal bipyramids that share corners with two equivalent Na(1)O6 octahedra and corners with three equivalent Na(2)O5 square pyramids. The corner-sharing octahedral tilt angles are 7°. In the second W site, W(2) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form WO6 octahedra that share corners with four equivalent Na(1)O6 octahedra and corners with two equivalent Na(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-3°. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), four equivalent Ba(1), and one W(2) atom to form distorted OBa4NaW octahedra that share corners with two equivalent O(2)Ba4NaW octahedra, corners with four equivalent O(4)Ba4NaW octahedra, corners with four equivalent O(7)Ba2NaW trigonal pyramids, edges with two equivalent O(2)Ba4NaW octahedra, faces with two equivalent O(4)Ba4NaW octahedra, and faces with four equivalent O(3)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the second O site, O(2) is bonded to one Na(1), four equivalent Ba(1), and one W(2) atom to form distorted OBa4NaW octahedra that share corners with two equivalent O(1)Ba4NaW octahedra, corners with four equivalent O(4)Ba4NaW octahedra, corners with four equivalent O(7)Ba2NaW trigonal pyramids, edges with two equivalent O(1)Ba4NaW octahedra, faces with two equivalent O(4)Ba4NaW octahedra, and faces with four equivalent O(3)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the third O site, O(3) is bonded to one Na(1), four equivalent Ba(1), and one W(2) atom to form distorted OBa4NaW octahedra that share corners with two equivalent O(3)Ba4NaW octahedra, corners with four equivalent O(4)Ba4NaW octahedra, corners with four equivalent O(7)Ba2NaW trigonal pyramids, edges with two equivalent O(3)Ba4NaW octahedra, faces with two equivalent O(1)Ba4NaW octahedra, faces with two equivalent O(2)Ba4NaW octahedra, and faces with two equivalent O(4)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 1-55°. In the fourth O site, O(4) is bonded to one Na(2), four equivalent Ba(1), and one W(2) atom to form distorted OBa4NaW octahedra that share corners with two equivalent O(1)Ba4NaW octahedra, corners with two equivalent O(2)Ba4NaW octahedra, corners with four equivalent O(3)Ba4NaW octahedra, corners with six equivalent O(4)Ba4NaW octahedra, corners with two equivalent O(7)Ba2NaW trigonal pyramids, edges with two equivalent O(7)Ba2NaW trigonal pyramids,  a faceface with one O(1)Ba4NaW octahedra,  a faceface with one O(2)Ba4NaW octahedra, and faces with two equivalent O(3)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 2-56°. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Na(1), four equivalent Ba(1), and one W(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Na(2), four equivalent Ba(1), and one W(1) atom. In the seventh O site, O(7) is bonded to one Na(2), two equivalent Ba(1), and one W(1) atom to form distorted OBa2NaW trigonal pyramids that share corners with two equivalent O(1)Ba4NaW octahedra, corners with two equivalent O(2)Ba4NaW octahedra, corners with two equivalent O(4)Ba4NaW octahedra, corners with four equivalent O(3)Ba4NaW octahedra, corners with two equivalent O(7)Ba2NaW trigonal pyramids, and edges with two equivalent O(4)Ba4NaW octahedra. The corner-sharing octahedral tilt angles range from 28-81°. is represented by the CIF file [CIF]
data_Ba4Na2W2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.007
_cell_length_b   6.007
_cell_length_c   8.710
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   91.135
_symmetry_Int_Tables_number   1
_cell_volume   314.197
_cell_formula_units_Z   1
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
  Ba  Ba0  1  0.022  0.476  0.279  1.0
  Ba  Ba1  1  0.022  0.476  0.721  1.0
  Ba  Ba2  1  0.524  0.978  0.279  1.0
  Ba  Ba3  1  0.524  0.978  0.721  1.0
  Na  Na4  1  0.516  0.484  0.500  1.0
  Na  Na5  1  0.979  0.021  0.000  1.0
  W  W6  1  0.501  0.499  0.000  1.0
  W  W7  1  0.020  0.980  0.500  1.0
  O  O8  1  0.246  0.754  0.500  1.0
  O  O9  1  0.789  0.211  0.500  1.0
  O  O10  1  0.782  0.756  0.500  1.0
  O  O11  1  0.244  0.218  0.500  1.0
  O  O12  1  0.023  0.977  0.271  1.0
  O  O13  1  0.023  0.977  0.729  1.0
  O  O14  1  0.493  0.507  0.777  1.0
  O  O15  1  0.493  0.507  0.223  1.0
  O  O16  1  0.717  0.283  0.000  1.0
  O  O17  1  0.597  0.801  0.000  1.0
  O  O18  1  0.199  0.403  0.000  1.0
[/CIF]
.