The structure described by Na4TeO5 is Caswellsilverite-like structured and crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(5)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, corners with three equivalent Na(3)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with three equivalent Na(2)O6 octahedra, and edges with three equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-22°. In the second Na site, Na(2) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(5)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Te(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Te(1)O6 octahedra, edges with three equivalent Na(1)O6 octahedra, and edges with three equivalent Na(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-21°. In the third Na site, Na(3) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(4)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with three equivalent Na(2)O6 octahedra, and edges with three equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-22°. In the fourth Na site, Na(4) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Te(1)O6 octahedra, edges with four equivalent Na(2)O6 octahedra, and edges with four equivalent Na(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-19°. In the fifth Na site, Na(5) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with four equivalent Na(1)O6 octahedra, and edges with four equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-20°. Te(1) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form TeO6 octahedra that share  a cornercorner with one Na(4)O6 octahedra, corners with two equivalent Na(1)O6 octahedra, corners with three equivalent Na(2)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Te(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with three equivalent Na(1)O6 octahedra, and edges with three equivalent Na(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-15°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), one Na(5), two equivalent Na(1), and one Te(1) atom to form distorted ONa5Te octahedra that share  a cornercorner with one O(4)Na4Te2 octahedra,  a cornercorner with one O(1)Na5Te octahedra,  a cornercorner with one O(2)Na5Te octahedra,  a cornercorner with one O(3)Na5Te octahedra,  an edgeedge with one O(1)Na5Te octahedra, edges with two equivalent O(2)Na5Te octahedra, edges with three equivalent O(3)Na5Te octahedra, and edges with four equivalent O(4)Na4Te2 octahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the second O site, O(2) is bonded to one Na(4), two equivalent Na(2), two equivalent Na(3), and one Te(1) atom to form distorted ONa5Te octahedra that share  a cornercorner with one O(1)Na5Te octahedra,  a cornercorner with one O(2)Na5Te octahedra,  a cornercorner with one O(3)Na5Te octahedra, corners with two equivalent O(4)Na4Te2 octahedra,  an edgeedge with one O(4)Na4Te2 octahedra, edges with two equivalent O(1)Na5Te octahedra, edges with two equivalent O(2)Na5Te octahedra, and edges with three equivalent O(3)Na5Te octahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Na(5), and one Te(1) atom to form distorted ONa5Te octahedra that share  a cornercorner with one O(4)Na4Te2 octahedra,  a cornercorner with one O(1)Na5Te octahedra,  a cornercorner with one O(2)Na5Te octahedra, corners with two equivalent O(3)Na5Te octahedra, edges with three equivalent O(4)Na4Te2 octahedra, edges with three equivalent O(1)Na5Te octahedra, and edges with three equivalent O(2)Na5Te octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the fourth O site, O(4) is bonded to one Na(2), one Na(5), two equivalent Na(1), and two equivalent Te(1) atoms to form distorted ONa4Te2 octahedra that share  a cornercorner with one O(4)Na4Te2 octahedra,  a cornercorner with one O(1)Na5Te octahedra,  a cornercorner with one O(3)Na5Te octahedra, corners with two equivalent O(2)Na5Te octahedra,  an edgeedge with one O(2)Na5Te octahedra, edges with two equivalent O(4)Na4Te2 octahedra, edges with three equivalent O(3)Na5Te octahedra, and edges with four equivalent O(1)Na5Te octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(3), and one Te(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4TeO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.654
_cell_length_b   5.684
_cell_length_c   8.479
_cell_angle_alpha   101.655
_cell_angle_beta   108.904
_cell_angle_gamma   102.531
_symmetry_Int_Tables_number   1
_cell_volume   240.472
_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  0.687  0.482  0.901  1.0
  Na  Na1  1  0.883  0.505  0.304  1.0
  Na  Na2  1  0.697  0.003  0.401  1.0
  Na  Na3  1  0.303  0.997  0.599  1.0
  Na  Na4  1  0.313  0.518  0.099  1.0
  Na  Na5  1  0.500  0.500  0.500  1.0
  Na  Na6  1  0.500  0.000  0.000  1.0
  Na  Na7  1  0.117  0.495  0.696  1.0
  Te  Te8  1  0.901  0.994  0.796  1.0
  Te  Te9  1  0.099  0.006  0.204  1.0
  O  O10  1  0.243  0.214  0.846  1.0
  O  O11  1  0.757  0.786  0.154  1.0
  O  O12  1  0.910  0.774  0.597  1.0
  O  O13  1  0.090  0.226  0.403  1.0
  O  O14  1  0.435  0.223  0.240  1.0
  O  O15  1  0.565  0.777  0.760  1.0
  O  O16  1  0.076  0.806  0.962  1.0
  O  O17  1  0.924  0.194  0.038  1.0
  O  O18  1  0.258  0.790  0.314  1.0
  O  O19  1  0.742  0.210  0.686  1.0
[/CIF]
.
The structure described by Na4TeO5 is Caswellsilverite-like structured and crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(5)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, corners with three equivalent Na(3)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with three equivalent Na(2)O6 octahedra, and edges with three equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-22°. In the second Na site, Na(2) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(5)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Te(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Te(1)O6 octahedra, edges with three equivalent Na(1)O6 octahedra, and edges with three equivalent Na(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-21°. In the third Na site, Na(3) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(4)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with three equivalent Na(2)O6 octahedra, and edges with three equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-22°. In the fourth Na site, Na(4) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Te(1)O6 octahedra, edges with four equivalent Na(2)O6 octahedra, and edges with four equivalent Na(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-19°. In the fifth Na site, Na(5) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with four equivalent Na(1)O6 octahedra, and edges with four equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-20°. Te(1) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form TeO6 octahedra that share  a cornercorner with one Na(4)O6 octahedra, corners with two equivalent Na(1)O6 octahedra, corners with three equivalent Na(2)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Te(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with three equivalent Na(1)O6 octahedra, and edges with three equivalent Na(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-15°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), one Na(5), two equivalent Na(1), and one Te(1) atom to form distorted ONa5Te octahedra that share  a cornercorner with one O(4)Na4Te2 octahedra,  a cornercorner with one O(1)Na5Te octahedra,  a cornercorner with one O(2)Na5Te octahedra,  a cornercorner with one O(3)Na5Te octahedra,  an edgeedge with one O(1)Na5Te octahedra, edges with two equivalent O(2)Na5Te octahedra, edges with three equivalent O(3)Na5Te octahedra, and edges with four equivalent O(4)Na4Te2 octahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the second O site, O(2) is bonded to one Na(4), two equivalent Na(2), two equivalent Na(3), and one Te(1) atom to form distorted ONa5Te octahedra that share  a cornercorner with one O(1)Na5Te octahedra,  a cornercorner with one O(2)Na5Te octahedra,  a cornercorner with one O(3)Na5Te octahedra, corners with two equivalent O(4)Na4Te2 octahedra,  an edgeedge with one O(4)Na4Te2 octahedra, edges with two equivalent O(1)Na5Te octahedra, edges with two equivalent O(2)Na5Te octahedra, and edges with three equivalent O(3)Na5Te octahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Na(5), and one Te(1) atom to form distorted ONa5Te octahedra that share  a cornercorner with one O(4)Na4Te2 octahedra,  a cornercorner with one O(1)Na5Te octahedra,  a cornercorner with one O(2)Na5Te octahedra, corners with two equivalent O(3)Na5Te octahedra, edges with three equivalent O(4)Na4Te2 octahedra, edges with three equivalent O(1)Na5Te octahedra, and edges with three equivalent O(2)Na5Te octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the fourth O site, O(4) is bonded to one Na(2), one Na(5), two equivalent Na(1), and two equivalent Te(1) atoms to form distorted ONa4Te2 octahedra that share  a cornercorner with one O(4)Na4Te2 octahedra,  a cornercorner with one O(1)Na5Te octahedra,  a cornercorner with one O(3)Na5Te octahedra, corners with two equivalent O(2)Na5Te octahedra,  an edgeedge with one O(2)Na5Te octahedra, edges with two equivalent O(4)Na4Te2 octahedra, edges with three equivalent O(3)Na5Te octahedra, and edges with four equivalent O(1)Na5Te octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(3), and one Te(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4TeO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.654
_cell_length_b   5.684
_cell_length_c   8.479
_cell_angle_alpha   101.655
_cell_angle_beta   108.904
_cell_angle_gamma   102.531
_symmetry_Int_Tables_number   1
_cell_volume   240.472
_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  0.687  0.482  0.901  1.0
  Na  Na1  1  0.883  0.505  0.304  1.0
  Na  Na2  1  0.697  0.003  0.401  1.0
  Na  Na3  1  0.303  0.997  0.599  1.0
  Na  Na4  1  0.313  0.518  0.099  1.0
  Na  Na5  1  0.500  0.500  0.500  1.0
  Na  Na6  1  0.500  0.000  0.000  1.0
  Na  Na7  1  0.117  0.495  0.696  1.0
  Te  Te8  1  0.901  0.994  0.796  1.0
  Te  Te9  1  0.099  0.006  0.204  1.0
  O  O10  1  0.243  0.214  0.846  1.0
  O  O11  1  0.757  0.786  0.154  1.0
  O  O12  1  0.910  0.774  0.597  1.0
  O  O13  1  0.090  0.226  0.403  1.0
  O  O14  1  0.435  0.223  0.240  1.0
  O  O15  1  0.565  0.777  0.760  1.0
  O  O16  1  0.076  0.806  0.962  1.0
  O  O17  1  0.924  0.194  0.038  1.0
  O  O18  1  0.258  0.790  0.314  1.0
  O  O19  1  0.742  0.210  0.686  1.0
[/CIF]
.