The crystal structure described by Ba3Zn6Si4TeO20 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to two equivalent O(6) and four equivalent O(3) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form distorted ZnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Zn(2)O4 tetrahedra,  an edgeedge with one Zn(1)O6 octahedra, and edges with two equivalent Te(1)O6 octahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form ZnO4 tetrahedra that share  a cornercorner with one Te(1)O6 octahedra, corners with two equivalent Zn(1)O6 octahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-70°. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Zn(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with three equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. Te(1) is bonded to two equivalent O(4) and four equivalent O(5) atoms to form TeO6 octahedra that share corners with four equivalent Zn(2)O4 tetrahedra and edges with four equivalent Zn(1)O6 octahedra. There are six inequivalent O sites. In the first O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one Si(1) atom. In the second O site, O(3) is bonded to one Ba(1), one Ba(2), one Zn(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OBa2ZnSi tetrahedra. In the third O site, O(4) is bonded in a distorted see-saw-like geometry to one Ba(1), two equivalent Zn(1), and one Te(1) atom. In the fourth O site, O(5) is bonded in a 3-coordinate geometry to one Ba(1), one Zn(1), one Zn(2), and one Te(1) atom. In the fifth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ba(2) and two equivalent Si(1) atoms. In the sixth O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1), one Zn(2), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba3Zn6Si4TeO20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.978
_cell_length_b   9.978
_cell_length_c   5.209
_cell_angle_alpha   76.016
_cell_angle_beta   76.016
_cell_angle_gamma   71.629
_symmetry_Int_Tables_number   1
_cell_volume   469.793
_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  0.787  0.787  0.747  1.0
  Ba  Ba1  1  0.213  0.213  0.253  1.0
  Ba  Ba2  1  0.500  0.500  0.000  1.0
  Zn  Zn3  1  0.156  0.844  0.500  1.0
  Zn  Zn4  1  0.844  0.156  0.500  1.0
  Zn  Zn5  1  0.364  0.923  0.828  1.0
  Zn  Zn6  1  0.077  0.636  0.172  1.0
  Zn  Zn7  1  0.636  0.077  0.172  1.0
  Zn  Zn8  1  0.923  0.364  0.828  1.0
  Si  Si9  1  0.519  0.781  0.342  1.0
  Si  Si10  1  0.219  0.481  0.658  1.0
  Si  Si11  1  0.481  0.219  0.658  1.0
  Si  Si12  1  0.781  0.519  0.342  1.0
  Te  Te13  1  0.000  0.000  0.000  1.0
  O  O14  1  0.617  0.884  0.341  1.0
  O  O15  1  0.116  0.383  0.659  1.0
  O  O16  1  0.383  0.116  0.659  1.0
  O  O17  1  0.884  0.617  0.341  1.0
  O  O18  1  0.366  0.815  0.551  1.0
  O  O19  1  0.185  0.634  0.449  1.0
  O  O20  1  0.634  0.185  0.449  1.0
  O  O21  1  0.815  0.366  0.551  1.0
  O  O22  1  0.505  0.777  0.036  1.0
  O  O23  1  0.223  0.495  0.964  1.0
  O  O24  1  0.495  0.223  0.964  1.0
  O  O25  1  0.777  0.505  0.036  1.0
  O  O26  1  0.930  0.930  0.367  1.0
  O  O27  1  0.070  0.070  0.633  1.0
  O  O28  1  0.189  0.953  0.107  1.0
  O  O29  1  0.047  0.811  0.893  1.0
  O  O30  1  0.811  0.047  0.893  1.0
  O  O31  1  0.953  0.189  0.107  1.0
  O  O32  1  0.610  0.610  0.464  1.0
  O  O33  1  0.390  0.390  0.536  1.0
[/CIF]
.
The crystal structure described by Ba3Zn6Si4TeO20 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to two equivalent O(6) and four equivalent O(3) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form distorted ZnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Zn(2)O4 tetrahedra,  an edgeedge with one Zn(1)O6 octahedra, and edges with two equivalent Te(1)O6 octahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form ZnO4 tetrahedra that share  a cornercorner with one Te(1)O6 octahedra, corners with two equivalent Zn(1)O6 octahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-70°. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Zn(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with three equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. Te(1) is bonded to two equivalent O(4) and four equivalent O(5) atoms to form TeO6 octahedra that share corners with four equivalent Zn(2)O4 tetrahedra and edges with four equivalent Zn(1)O6 octahedra. There are six inequivalent O sites. In the first O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one Si(1) atom. In the second O site, O(3) is bonded to one Ba(1), one Ba(2), one Zn(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OBa2ZnSi tetrahedra. In the third O site, O(4) is bonded in a distorted see-saw-like geometry to one Ba(1), two equivalent Zn(1), and one Te(1) atom. In the fourth O site, O(5) is bonded in a 3-coordinate geometry to one Ba(1), one Zn(1), one Zn(2), and one Te(1) atom. In the fifth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ba(2) and two equivalent Si(1) atoms. In the sixth O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1), one Zn(2), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba3Zn6Si4TeO20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.978
_cell_length_b   9.978
_cell_length_c   5.209
_cell_angle_alpha   76.016
_cell_angle_beta   76.016
_cell_angle_gamma   71.629
_symmetry_Int_Tables_number   1
_cell_volume   469.793
_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  0.787  0.787  0.747  1.0
  Ba  Ba1  1  0.213  0.213  0.253  1.0
  Ba  Ba2  1  0.500  0.500  0.000  1.0
  Zn  Zn3  1  0.156  0.844  0.500  1.0
  Zn  Zn4  1  0.844  0.156  0.500  1.0
  Zn  Zn5  1  0.364  0.923  0.828  1.0
  Zn  Zn6  1  0.077  0.636  0.172  1.0
  Zn  Zn7  1  0.636  0.077  0.172  1.0
  Zn  Zn8  1  0.923  0.364  0.828  1.0
  Si  Si9  1  0.519  0.781  0.342  1.0
  Si  Si10  1  0.219  0.481  0.658  1.0
  Si  Si11  1  0.481  0.219  0.658  1.0
  Si  Si12  1  0.781  0.519  0.342  1.0
  Te  Te13  1  0.000  0.000  0.000  1.0
  O  O14  1  0.617  0.884  0.341  1.0
  O  O15  1  0.116  0.383  0.659  1.0
  O  O16  1  0.383  0.116  0.659  1.0
  O  O17  1  0.884  0.617  0.341  1.0
  O  O18  1  0.366  0.815  0.551  1.0
  O  O19  1  0.185  0.634  0.449  1.0
  O  O20  1  0.634  0.185  0.449  1.0
  O  O21  1  0.815  0.366  0.551  1.0
  O  O22  1  0.505  0.777  0.036  1.0
  O  O23  1  0.223  0.495  0.964  1.0
  O  O24  1  0.495  0.223  0.964  1.0
  O  O25  1  0.777  0.505  0.036  1.0
  O  O26  1  0.930  0.930  0.367  1.0
  O  O27  1  0.070  0.070  0.633  1.0
  O  O28  1  0.189  0.953  0.107  1.0
  O  O29  1  0.047  0.811  0.893  1.0
  O  O30  1  0.811  0.047  0.893  1.0
  O  O31  1  0.953  0.189  0.107  1.0
  O  O32  1  0.610  0.610  0.464  1.0
  O  O33  1  0.390  0.390  0.536  1.0
[/CIF]
.