The structure described by Ba8Bi4O17 crystallizes in the tetragonal I4mm space group. There are five inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(4), four equivalent O(1), and four equivalent O(2) atoms. In the second Ba site, Ba(2) is bonded to one O(3), one O(4), and four equivalent O(2) atoms to form distorted BaO6 pentagonal pyramids that share  a cornercorner with one Bi(1)O6 octahedra,  a cornercorner with one Bi(2)O6 octahedra, and corners with four equivalent Bi(3)O5 trigonal bipyramids. The corner-sharing octahedra are not tilted. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(6), and four equivalent O(5) atoms. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to two equivalent O(7), two equivalent O(8), and four equivalent O(1) atoms. In the fifth Ba site, Ba(5) is bonded to one O(8) and four equivalent O(1) atoms to form distorted BaO5 square pyramids that share  a cornercorner with one Bi(1)O6 octahedra and corners with four equivalent Bi(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-16°. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(3), one O(8), and four equivalent O(5) atoms to form BiO6 octahedra that share corners with four equivalent Bi(4)O6 octahedra,  a cornercorner with one Ba(2)O6 pentagonal pyramid, and  a cornercorner with one Ba(5)O5 square pyramid. The corner-sharing octahedral tilt angles are 11°. In the second Bi site, Bi(2) is bonded to one O(4), one O(7), and four equivalent O(1) atoms to form BiO6 octahedra that share  a cornercorner with one Bi(4)O6 octahedra,  a cornercorner with one Ba(2)O6 pentagonal pyramid, and corners with four equivalent Ba(5)O5 square pyramids. The corner-sharing octahedra are not tilted. In the third Bi site, Bi(3) is bonded to one O(6) and four equivalent O(2) atoms to form distorted BiO5 trigonal bipyramids that share  a cornercorner with one Bi(4)O6 octahedra and corners with four equivalent Ba(2)O6 pentagonal pyramids. The corner-sharing octahedra are not tilted. In the fourth Bi site, Bi(4) is bonded to one O(6), one O(7), and four equivalent O(5) atoms to form distorted BiO6 octahedra that share  a cornercorner with one Bi(2)O6 octahedra, corners with four equivalent Bi(1)O6 octahedra, and  a cornercorner with one Bi(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-11°. There are eight inequivalent O sites. In the first O site, O(6) is bonded in a distorted single-bond geometry to four equivalent Ba(3), one Bi(3), and one Bi(4) atom. In the second O site, O(7) is bonded in a distorted linear geometry to four equivalent Ba(4), one Bi(2), and one Bi(4) atom. In the third O site, O(8) is bonded in a 6-coordinate geometry to one Ba(5), four equivalent Ba(4), and one Bi(1) atom. In the fourth O site, O(1) is bonded in a 6-coordinate geometry to one Ba(5), two equivalent Ba(1), two equivalent Ba(4), and one Bi(2) atom. In the fifth O site, O(2) is bonded to one Ba(2), two equivalent Ba(1), and one Bi(3) atom to form a mixture of distorted corner and edge-sharing OBa3Bi tetrahedra. In the sixth O site, O(3) is bonded in a distorted linear geometry to one Ba(2), four equivalent Ba(3), and one Bi(1) atom. In the seventh O site, O(4) is bonded in a distorted linear geometry to one Ba(2), four equivalent Ba(1), and one Bi(2) atom. In the eighth O site, O(5) is bonded in a distorted see-saw-like geometry to two equivalent Ba(3), one Bi(1), and one Bi(4) atom. is represented by the CIF card [CIF]
data_Ba8Bi4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.418
_cell_length_b   19.345
_cell_length_c   17.084
_cell_angle_alpha   19.017
_cell_angle_beta   55.702
_cell_angle_gamma   60.156
_symmetry_Int_Tables_number   1
_cell_volume   566.101
_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  0.242  0.247  0.258  1.0
  Ba  Ba1  1  0.496  0.165  0.504  1.0
  Ba  Ba2  1  0.178  0.559  0.322  1.0
  Ba  Ba3  1  0.678  0.059  0.822  1.0
  Ba  Ba4  1  0.205  0.902  0.295  1.0
  Ba  Ba5  1  0.705  0.402  0.795  1.0
  Ba  Ba6  1  0.459  0.820  0.541  1.0
  Ba  Ba7  1  0.742  0.747  0.758  1.0
  Bi  Bi8  1  0.981  0.994  0.019  1.0
  Bi  Bi9  1  0.995  0.332  0.005  1.0
  Bi  Bi10  1  0.004  0.668  0.996  1.0
  Bi  Bi11  1  0.473  0.491  0.527  1.0
  O  O12  1  0.245  0.105  0.220  1.0
  O  O13  1  0.300  0.472  0.142  1.0
  O  O14  1  0.780  0.105  0.220  1.0
  O  O15  1  0.216  0.072  0.784  1.0
  O  O16  1  0.770  0.257  0.230  1.0
  O  O17  1  0.243  0.757  0.243  1.0
  O  O18  1  0.243  0.243  0.757  1.0
  O  O19  1  0.858  0.472  0.142  1.0
  O  O20  1  0.775  0.592  0.225  1.0
  O  O21  1  0.243  0.414  0.757  1.0
  O  O22  1  0.245  0.570  0.755  1.0
  O  O23  1  0.757  0.243  0.757  1.0
  O  O24  1  0.757  0.757  0.243  1.0
  O  O25  1  0.754  0.918  0.246  1.0
  O  O26  1  0.300  0.914  0.700  1.0
  O  O27  1  0.780  0.570  0.755  1.0
  O  O28  1  0.858  0.914  0.700  1.0
[/CIF]
.
The structure described by Ba8Bi4O17 crystallizes in the tetragonal I4mm space group. There are five inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(4), four equivalent O(1), and four equivalent O(2) atoms. In the second Ba site, Ba(2) is bonded to one O(3), one O(4), and four equivalent O(2) atoms to form distorted BaO6 pentagonal pyramids that share  a cornercorner with one Bi(1)O6 octahedra,  a cornercorner with one Bi(2)O6 octahedra, and corners with four equivalent Bi(3)O5 trigonal bipyramids. The corner-sharing octahedra are not tilted. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(6), and four equivalent O(5) atoms. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to two equivalent O(7), two equivalent O(8), and four equivalent O(1) atoms. In the fifth Ba site, Ba(5) is bonded to one O(8) and four equivalent O(1) atoms to form distorted BaO5 square pyramids that share  a cornercorner with one Bi(1)O6 octahedra and corners with four equivalent Bi(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-16°. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(3), one O(8), and four equivalent O(5) atoms to form BiO6 octahedra that share corners with four equivalent Bi(4)O6 octahedra,  a cornercorner with one Ba(2)O6 pentagonal pyramid, and  a cornercorner with one Ba(5)O5 square pyramid. The corner-sharing octahedral tilt angles are 11°. In the second Bi site, Bi(2) is bonded to one O(4), one O(7), and four equivalent O(1) atoms to form BiO6 octahedra that share  a cornercorner with one Bi(4)O6 octahedra,  a cornercorner with one Ba(2)O6 pentagonal pyramid, and corners with four equivalent Ba(5)O5 square pyramids. The corner-sharing octahedra are not tilted. In the third Bi site, Bi(3) is bonded to one O(6) and four equivalent O(2) atoms to form distorted BiO5 trigonal bipyramids that share  a cornercorner with one Bi(4)O6 octahedra and corners with four equivalent Ba(2)O6 pentagonal pyramids. The corner-sharing octahedra are not tilted. In the fourth Bi site, Bi(4) is bonded to one O(6), one O(7), and four equivalent O(5) atoms to form distorted BiO6 octahedra that share  a cornercorner with one Bi(2)O6 octahedra, corners with four equivalent Bi(1)O6 octahedra, and  a cornercorner with one Bi(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-11°. There are eight inequivalent O sites. In the first O site, O(6) is bonded in a distorted single-bond geometry to four equivalent Ba(3), one Bi(3), and one Bi(4) atom. In the second O site, O(7) is bonded in a distorted linear geometry to four equivalent Ba(4), one Bi(2), and one Bi(4) atom. In the third O site, O(8) is bonded in a 6-coordinate geometry to one Ba(5), four equivalent Ba(4), and one Bi(1) atom. In the fourth O site, O(1) is bonded in a 6-coordinate geometry to one Ba(5), two equivalent Ba(1), two equivalent Ba(4), and one Bi(2) atom. In the fifth O site, O(2) is bonded to one Ba(2), two equivalent Ba(1), and one Bi(3) atom to form a mixture of distorted corner and edge-sharing OBa3Bi tetrahedra. In the sixth O site, O(3) is bonded in a distorted linear geometry to one Ba(2), four equivalent Ba(3), and one Bi(1) atom. In the seventh O site, O(4) is bonded in a distorted linear geometry to one Ba(2), four equivalent Ba(1), and one Bi(2) atom. In the eighth O site, O(5) is bonded in a distorted see-saw-like geometry to two equivalent Ba(3), one Bi(1), and one Bi(4) atom. is represented by the CIF card [CIF]
data_Ba8Bi4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.418
_cell_length_b   19.345
_cell_length_c   17.084
_cell_angle_alpha   19.017
_cell_angle_beta   55.702
_cell_angle_gamma   60.156
_symmetry_Int_Tables_number   1
_cell_volume   566.101
_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  0.242  0.247  0.258  1.0
  Ba  Ba1  1  0.496  0.165  0.504  1.0
  Ba  Ba2  1  0.178  0.559  0.322  1.0
  Ba  Ba3  1  0.678  0.059  0.822  1.0
  Ba  Ba4  1  0.205  0.902  0.295  1.0
  Ba  Ba5  1  0.705  0.402  0.795  1.0
  Ba  Ba6  1  0.459  0.820  0.541  1.0
  Ba  Ba7  1  0.742  0.747  0.758  1.0
  Bi  Bi8  1  0.981  0.994  0.019  1.0
  Bi  Bi9  1  0.995  0.332  0.005  1.0
  Bi  Bi10  1  0.004  0.668  0.996  1.0
  Bi  Bi11  1  0.473  0.491  0.527  1.0
  O  O12  1  0.245  0.105  0.220  1.0
  O  O13  1  0.300  0.472  0.142  1.0
  O  O14  1  0.780  0.105  0.220  1.0
  O  O15  1  0.216  0.072  0.784  1.0
  O  O16  1  0.770  0.257  0.230  1.0
  O  O17  1  0.243  0.757  0.243  1.0
  O  O18  1  0.243  0.243  0.757  1.0
  O  O19  1  0.858  0.472  0.142  1.0
  O  O20  1  0.775  0.592  0.225  1.0
  O  O21  1  0.243  0.414  0.757  1.0
  O  O22  1  0.245  0.570  0.755  1.0
  O  O23  1  0.757  0.243  0.757  1.0
  O  O24  1  0.757  0.757  0.243  1.0
  O  O25  1  0.754  0.918  0.246  1.0
  O  O26  1  0.300  0.914  0.700  1.0
  O  O27  1  0.780  0.570  0.755  1.0
  O  O28  1  0.858  0.914  0.700  1.0
[/CIF]
.