The material described by Zn2Bi2O5 crystallizes in the triclinic P1 space group. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form ZnO4 trigonal pyramids that share corners with two equivalent Zn(1)O4 trigonal pyramids,  an edgeedge with one Zn(2)O4 tetrahedra, and edges with two equivalent Bi(4)O5 trigonal bipyramids. In the second Zn site, Zn(2) is bonded to one O(5), one O(6), and two equivalent O(3) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra, corners with two equivalent Bi(4)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. In the third Zn site, Zn(3) is bonded to one O(10), one O(8), and two equivalent O(7) atoms to form ZnO4 trigonal pyramids that share corners with two equivalent Bi(4)O5 trigonal bipyramids, corners with two equivalent Zn(3)O4 trigonal pyramids, and  an edgeedge with one Zn(4)O4 trigonal pyramid. In the fourth Zn site, Zn(4) is bonded to one O(10), one O(8), and two equivalent O(2) atoms to form a mixture of corner and edge-sharing ZnO4 trigonal pyramids. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(8) atoms. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(10) atoms. In the third Bi site, Bi(3) is bonded in a 3-coordinate geometry to one O(2), one O(9), and two equivalent O(5) atoms. In the fourth Bi site, Bi(4) is bonded to one O(4), one O(7), one O(9), and two equivalent O(6) atoms to form distorted BiO5 trigonal bipyramids that share corners with two equivalent Zn(2)O4 tetrahedra, corners with two equivalent Bi(4)O5 trigonal bipyramids, corners with two equivalent Zn(3)O4 trigonal pyramids, and edges with two equivalent Zn(1)O4 trigonal pyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Bi(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Zn(4), one Bi(2), and one Bi(3) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Zn(2) and one Bi(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Zn(1), one Bi(1), and one Bi(4) atom. In the fifth O site, O(5) is bonded to one Zn(1), one Zn(2), and two equivalent Bi(3) atoms to form a mixture of corner and edge-sharing OZn2Bi2 tetrahedra. In the sixth O site, O(6) is bonded to one Zn(1), one Zn(2), and two equivalent Bi(4) atoms to form a mixture of corner and edge-sharing OZn2Bi2 trigonal pyramids. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Zn(3) and one Bi(4) atom. In the eighth O site, O(8) is bonded to one Zn(3), one Zn(4), and two equivalent Bi(1) atoms to form a mixture of corner and edge-sharing OZn2Bi2 tetrahedra. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Bi(3) and one Bi(4) atom. In the tenth O site, O(10) is bonded to one Zn(3), one Zn(4), and two equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OZn2Bi2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zn2Bi2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.531
_cell_length_b   7.061
_cell_length_c   12.470
_cell_angle_alpha   92.181
_cell_angle_beta   92.339
_cell_angle_gamma   90.467
_symmetry_Int_Tables_number   1
_cell_volume   310.445
_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
  Zn  Zn0  1  0.500  0.375  0.094  1.0
  Zn  Zn1  1  0.490  0.616  0.884  1.0
  Zn  Zn2  1  0.489  0.878  0.387  1.0
  Zn  Zn3  1  0.512  0.119  0.602  1.0
  Bi  Bi4  1  0.989  0.319  0.377  1.0
  Bi  Bi5  1  0.013  0.727  0.631  1.0
  Bi  Bi6  1  0.984  0.117  0.890  1.0
  Bi  Bi7  1  0.014  0.772  0.136  1.0
  O  O8  1  0.003  0.482  0.516  1.0
  O  O9  1  0.022  0.073  0.665  1.0
  O  O10  1  0.982  0.696  0.832  1.0
  O  O11  1  0.012  0.435  0.163  1.0
  O  O12  1  0.487  0.313  0.923  1.0
  O  O13  1  0.508  0.667  0.043  1.0
  O  O14  1  0.977  0.863  0.324  1.0
  O  O15  1  0.493  0.168  0.440  1.0
  O  O16  1  0.020  0.051  0.050  1.0
  O  O17  1  0.508  0.829  0.545  1.0
[/CIF]
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The material described by Zn2Bi2O5 crystallizes in the triclinic P1 space group. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form ZnO4 trigonal pyramids that share corners with two equivalent Zn(1)O4 trigonal pyramids,  an edgeedge with one Zn(2)O4 tetrahedra, and edges with two equivalent Bi(4)O5 trigonal bipyramids. In the second Zn site, Zn(2) is bonded to one O(5), one O(6), and two equivalent O(3) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra, corners with two equivalent Bi(4)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. In the third Zn site, Zn(3) is bonded to one O(10), one O(8), and two equivalent O(7) atoms to form ZnO4 trigonal pyramids that share corners with two equivalent Bi(4)O5 trigonal bipyramids, corners with two equivalent Zn(3)O4 trigonal pyramids, and  an edgeedge with one Zn(4)O4 trigonal pyramid. In the fourth Zn site, Zn(4) is bonded to one O(10), one O(8), and two equivalent O(2) atoms to form a mixture of corner and edge-sharing ZnO4 trigonal pyramids. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(8) atoms. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(10) atoms. In the third Bi site, Bi(3) is bonded in a 3-coordinate geometry to one O(2), one O(9), and two equivalent O(5) atoms. In the fourth Bi site, Bi(4) is bonded to one O(4), one O(7), one O(9), and two equivalent O(6) atoms to form distorted BiO5 trigonal bipyramids that share corners with two equivalent Zn(2)O4 tetrahedra, corners with two equivalent Bi(4)O5 trigonal bipyramids, corners with two equivalent Zn(3)O4 trigonal pyramids, and edges with two equivalent Zn(1)O4 trigonal pyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Bi(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Zn(4), one Bi(2), and one Bi(3) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Zn(2) and one Bi(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Zn(1), one Bi(1), and one Bi(4) atom. In the fifth O site, O(5) is bonded to one Zn(1), one Zn(2), and two equivalent Bi(3) atoms to form a mixture of corner and edge-sharing OZn2Bi2 tetrahedra. In the sixth O site, O(6) is bonded to one Zn(1), one Zn(2), and two equivalent Bi(4) atoms to form a mixture of corner and edge-sharing OZn2Bi2 trigonal pyramids. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Zn(3) and one Bi(4) atom. In the eighth O site, O(8) is bonded to one Zn(3), one Zn(4), and two equivalent Bi(1) atoms to form a mixture of corner and edge-sharing OZn2Bi2 tetrahedra. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Bi(3) and one Bi(4) atom. In the tenth O site, O(10) is bonded to one Zn(3), one Zn(4), and two equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OZn2Bi2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zn2Bi2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.531
_cell_length_b   7.061
_cell_length_c   12.470
_cell_angle_alpha   92.181
_cell_angle_beta   92.339
_cell_angle_gamma   90.467
_symmetry_Int_Tables_number   1
_cell_volume   310.445
_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
  Zn  Zn0  1  0.500  0.375  0.094  1.0
  Zn  Zn1  1  0.490  0.616  0.884  1.0
  Zn  Zn2  1  0.489  0.878  0.387  1.0
  Zn  Zn3  1  0.512  0.119  0.602  1.0
  Bi  Bi4  1  0.989  0.319  0.377  1.0
  Bi  Bi5  1  0.013  0.727  0.631  1.0
  Bi  Bi6  1  0.984  0.117  0.890  1.0
  Bi  Bi7  1  0.014  0.772  0.136  1.0
  O  O8  1  0.003  0.482  0.516  1.0
  O  O9  1  0.022  0.073  0.665  1.0
  O  O10  1  0.982  0.696  0.832  1.0
  O  O11  1  0.012  0.435  0.163  1.0
  O  O12  1  0.487  0.313  0.923  1.0
  O  O13  1  0.508  0.667  0.043  1.0
  O  O14  1  0.977  0.863  0.324  1.0
  O  O15  1  0.493  0.168  0.440  1.0
  O  O16  1  0.020  0.051  0.050  1.0
  O  O17  1  0.508  0.829  0.545  1.0
[/CIF]
.