The crystal structure described by Bi4V2O11 crystallizes in the triclinic P1 space group. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(3), one O(5), one O(8), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one Bi(2)O5 square pyramid,  a cornercorner with one Bi(3)O5 square pyramid, and  a cornercorner with one V(2)O4 tetrahedra. In the second V site, V(2) is bonded to one O(10), one O(11), one O(4), and one O(8) atom to form VO4 tetrahedra that share  a cornercorner with one Bi(2)O5 square pyramid,  a cornercorner with one Bi(3)O5 square pyramid, and  a cornercorner with one V(1)O4 tetrahedra. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(7), and one O(9) atom. In the second Bi site, Bi(2) is bonded to one O(1), one O(10), one O(2), one O(5), and one O(6) atom to form distorted BiO5 square pyramids that share corners with two equivalent Bi(3)O5 square pyramids,  a cornercorner with one V(1)O4 tetrahedra, and  a cornercorner with one V(2)O4 tetrahedra. In the third Bi site, Bi(3) is bonded to one O(1), one O(4), one O(6), one O(7), and one O(9) atom to form distorted BiO5 square pyramids that share corners with two equivalent Bi(2)O5 square pyramids,  a cornercorner with one V(1)O4 tetrahedra, and  a cornercorner with one V(2)O4 tetrahedra. In the fourth Bi site, Bi(4) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(5), one O(6), and one O(7) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(4) atom. In the third O site, O(3) is bonded in a single-bond geometry to one V(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one V(2), one Bi(1), and one Bi(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one V(1), one Bi(2), and one Bi(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Bi(2), one Bi(3), and one Bi(4) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Bi(1), one Bi(3), and one Bi(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one V(1) and one V(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one V(1), one Bi(1), and one Bi(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one V(2), one Bi(2), and one Bi(4) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one V(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_V2Bi4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.033
_cell_length_b   5.967
_cell_length_c   8.130
_cell_angle_alpha   93.494
_cell_angle_beta   111.755
_cell_angle_gamma   80.348
_symmetry_Int_Tables_number   1
_cell_volume   268.029
_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
  V  V0  1  0.510  0.429  0.998  1.0
  V  V1  1  0.947  0.988  0.998  1.0
  Bi  Bi2  1  0.110  0.453  0.339  1.0
  Bi  Bi3  1  0.257  0.947  0.653  1.0
  Bi  Bi4  1  0.601  0.946  0.343  1.0
  Bi  Bi5  1  0.770  0.449  0.656  1.0
  O  O6  1  0.990  0.736  0.507  1.0
  O  O7  1  0.986  0.238  0.485  1.0
  O  O8  1  0.244  0.401  0.999  1.0
  O  O9  1  0.176  0.054  0.194  1.0
  O  O10  1  0.473  0.562  0.801  1.0
  O  O11  1  0.480  0.734  0.487  1.0
  O  O12  1  0.499  0.235  0.512  1.0
  O  O13  1  0.657  0.135  0.997  1.0
  O  O14  1  0.673  0.559  0.197  1.0
  O  O15  1  0.979  0.053  0.800  1.0
  O  O16  1  0.925  0.716  0.999  1.0
[/CIF]
.
The crystal structure described by Bi4V2O11 crystallizes in the triclinic P1 space group. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(3), one O(5), one O(8), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one Bi(2)O5 square pyramid,  a cornercorner with one Bi(3)O5 square pyramid, and  a cornercorner with one V(2)O4 tetrahedra. In the second V site, V(2) is bonded to one O(10), one O(11), one O(4), and one O(8) atom to form VO4 tetrahedra that share  a cornercorner with one Bi(2)O5 square pyramid,  a cornercorner with one Bi(3)O5 square pyramid, and  a cornercorner with one V(1)O4 tetrahedra. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(7), and one O(9) atom. In the second Bi site, Bi(2) is bonded to one O(1), one O(10), one O(2), one O(5), and one O(6) atom to form distorted BiO5 square pyramids that share corners with two equivalent Bi(3)O5 square pyramids,  a cornercorner with one V(1)O4 tetrahedra, and  a cornercorner with one V(2)O4 tetrahedra. In the third Bi site, Bi(3) is bonded to one O(1), one O(4), one O(6), one O(7), and one O(9) atom to form distorted BiO5 square pyramids that share corners with two equivalent Bi(2)O5 square pyramids,  a cornercorner with one V(1)O4 tetrahedra, and  a cornercorner with one V(2)O4 tetrahedra. In the fourth Bi site, Bi(4) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(5), one O(6), and one O(7) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(4) atom. In the third O site, O(3) is bonded in a single-bond geometry to one V(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one V(2), one Bi(1), and one Bi(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one V(1), one Bi(2), and one Bi(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Bi(2), one Bi(3), and one Bi(4) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Bi(1), one Bi(3), and one Bi(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one V(1) and one V(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one V(1), one Bi(1), and one Bi(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one V(2), one Bi(2), and one Bi(4) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one V(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_V2Bi4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.033
_cell_length_b   5.967
_cell_length_c   8.130
_cell_angle_alpha   93.494
_cell_angle_beta   111.755
_cell_angle_gamma   80.348
_symmetry_Int_Tables_number   1
_cell_volume   268.029
_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
  V  V0  1  0.510  0.429  0.998  1.0
  V  V1  1  0.947  0.988  0.998  1.0
  Bi  Bi2  1  0.110  0.453  0.339  1.0
  Bi  Bi3  1  0.257  0.947  0.653  1.0
  Bi  Bi4  1  0.601  0.946  0.343  1.0
  Bi  Bi5  1  0.770  0.449  0.656  1.0
  O  O6  1  0.990  0.736  0.507  1.0
  O  O7  1  0.986  0.238  0.485  1.0
  O  O8  1  0.244  0.401  0.999  1.0
  O  O9  1  0.176  0.054  0.194  1.0
  O  O10  1  0.473  0.562  0.801  1.0
  O  O11  1  0.480  0.734  0.487  1.0
  O  O12  1  0.499  0.235  0.512  1.0
  O  O13  1  0.657  0.135  0.997  1.0
  O  O14  1  0.673  0.559  0.197  1.0
  O  O15  1  0.979  0.053  0.800  1.0
  O  O16  1  0.925  0.716  0.999  1.0
[/CIF]
.