The compound described by Ba2As6O11 crystallizes in the triclinic P-1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one O(11), one O(3), one O(4), one O(5), one O(8), one O(9), two equivalent O(1), and two equivalent O(6) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(11), one O(2), one O(5), one O(6), one O(7), one O(9), two equivalent O(10), and two equivalent O(4) atoms. There are six inequivalent As sites. In the first As site, As(1) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(7) atom. In the second As site, As(2) is bonded in a distorted T-shaped geometry to one O(5), one O(7), and one O(8) atom. In the third As site, As(3) is bonded in a distorted T-shaped geometry to one O(1), one O(4), and one O(9) atom. In the fourth As site, As(4) is bonded in a 3-coordinate geometry to one O(10), one O(11), and one O(6) atom. In the fifth As site, As(5) is bonded in a distorted T-shaped geometry to one O(1), one O(11), and one O(2) atom. In the sixth As site, As(6) is bonded in a distorted T-shaped geometry to one O(10), one O(8), and one O(9) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one As(3), and one As(5) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ba(2), one As(1), and one As(5) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ba(1) and one As(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Ba(2), and one As(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one As(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one As(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ba(2), one As(1), and one As(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one As(2), and one As(6) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(2), one As(3), and one As(6) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(2), one As(4), and one As(6) atom. In the eleventh O site, O(11) is bonded in a distorted tetrahedral geometry to one Ba(1), one Ba(2), one As(4), and one As(5) atom. is represented by the CIF card [CIF]
data_Ba2As6O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.366
_cell_length_b   9.103
_cell_length_c   9.351
_cell_angle_alpha   73.865
_cell_angle_beta   72.787
_cell_angle_gamma   75.913
_symmetry_Int_Tables_number   1
_cell_volume   643.335
_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
  Ba  Ba0  1  0.970  0.561  0.726  1.0
  Ba  Ba1  1  0.541  0.422  0.768  1.0
  Ba  Ba2  1  0.459  0.578  0.232  1.0
  Ba  Ba3  1  0.030  0.439  0.274  1.0
  As  As4  1  0.583  0.913  0.817  1.0
  As  As5  1  0.902  0.104  0.693  1.0
  As  As6  1  0.200  0.736  0.938  1.0
  As  As7  1  0.705  0.743  0.432  1.0
  As  As8  1  0.189  0.176  0.932  1.0
  As  As9  1  0.303  0.830  0.569  1.0
  As  As10  1  0.697  0.170  0.431  1.0
  As  As11  1  0.811  0.824  0.068  1.0
  As  As12  1  0.295  0.257  0.568  1.0
  As  As13  1  0.800  0.264  0.062  1.0
  As  As14  1  0.098  0.896  0.307  1.0
  As  As15  1  0.417  0.087  0.183  1.0
  O  O16  1  0.984  0.686  0.984  1.0
  O  O17  1  0.653  0.795  0.990  1.0
  O  O18  1  0.718  0.814  0.686  1.0
  O  O19  1  0.695  0.439  0.983  1.0
  O  O20  1  0.901  0.261  0.758  1.0
  O  O21  1  0.793  0.565  0.521  1.0
  O  O22  1  0.681  0.081  0.790  1.0
  O  O23  1  0.848  0.212  0.508  1.0
  O  O24  1  0.251  0.687  0.744  1.0
  O  O25  1  0.484  0.698  0.489  1.0
  O  O26  1  0.743  0.685  0.242  1.0
  O  O27  1  0.257  0.315  0.758  1.0
  O  O28  1  0.516  0.302  0.511  1.0
  O  O29  1  0.749  0.313  0.256  1.0
  O  O30  1  0.152  0.788  0.492  1.0
  O  O31  1  0.319  0.919  0.210  1.0
  O  O32  1  0.207  0.435  0.479  1.0
  O  O33  1  0.099  0.739  0.242  1.0
  O  O34  1  0.305  0.561  0.017  1.0
  O  O35  1  0.282  0.186  0.314  1.0
  O  O36  1  0.347  0.205  0.010  1.0
  O  O37  1  0.016  0.314  0.016  1.0
[/CIF]
.
The compound described by Ba2As6O11 crystallizes in the triclinic P-1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one O(11), one O(3), one O(4), one O(5), one O(8), one O(9), two equivalent O(1), and two equivalent O(6) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(11), one O(2), one O(5), one O(6), one O(7), one O(9), two equivalent O(10), and two equivalent O(4) atoms. There are six inequivalent As sites. In the first As site, As(1) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(7) atom. In the second As site, As(2) is bonded in a distorted T-shaped geometry to one O(5), one O(7), and one O(8) atom. In the third As site, As(3) is bonded in a distorted T-shaped geometry to one O(1), one O(4), and one O(9) atom. In the fourth As site, As(4) is bonded in a 3-coordinate geometry to one O(10), one O(11), and one O(6) atom. In the fifth As site, As(5) is bonded in a distorted T-shaped geometry to one O(1), one O(11), and one O(2) atom. In the sixth As site, As(6) is bonded in a distorted T-shaped geometry to one O(10), one O(8), and one O(9) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one As(3), and one As(5) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ba(2), one As(1), and one As(5) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ba(1) and one As(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Ba(2), and one As(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one As(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one As(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ba(2), one As(1), and one As(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one As(2), and one As(6) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(2), one As(3), and one As(6) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(2), one As(4), and one As(6) atom. In the eleventh O site, O(11) is bonded in a distorted tetrahedral geometry to one Ba(1), one Ba(2), one As(4), and one As(5) atom. is represented by the CIF card [CIF]
data_Ba2As6O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.366
_cell_length_b   9.103
_cell_length_c   9.351
_cell_angle_alpha   73.865
_cell_angle_beta   72.787
_cell_angle_gamma   75.913
_symmetry_Int_Tables_number   1
_cell_volume   643.335
_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
  Ba  Ba0  1  0.970  0.561  0.726  1.0
  Ba  Ba1  1  0.541  0.422  0.768  1.0
  Ba  Ba2  1  0.459  0.578  0.232  1.0
  Ba  Ba3  1  0.030  0.439  0.274  1.0
  As  As4  1  0.583  0.913  0.817  1.0
  As  As5  1  0.902  0.104  0.693  1.0
  As  As6  1  0.200  0.736  0.938  1.0
  As  As7  1  0.705  0.743  0.432  1.0
  As  As8  1  0.189  0.176  0.932  1.0
  As  As9  1  0.303  0.830  0.569  1.0
  As  As10  1  0.697  0.170  0.431  1.0
  As  As11  1  0.811  0.824  0.068  1.0
  As  As12  1  0.295  0.257  0.568  1.0
  As  As13  1  0.800  0.264  0.062  1.0
  As  As14  1  0.098  0.896  0.307  1.0
  As  As15  1  0.417  0.087  0.183  1.0
  O  O16  1  0.984  0.686  0.984  1.0
  O  O17  1  0.653  0.795  0.990  1.0
  O  O18  1  0.718  0.814  0.686  1.0
  O  O19  1  0.695  0.439  0.983  1.0
  O  O20  1  0.901  0.261  0.758  1.0
  O  O21  1  0.793  0.565  0.521  1.0
  O  O22  1  0.681  0.081  0.790  1.0
  O  O23  1  0.848  0.212  0.508  1.0
  O  O24  1  0.251  0.687  0.744  1.0
  O  O25  1  0.484  0.698  0.489  1.0
  O  O26  1  0.743  0.685  0.242  1.0
  O  O27  1  0.257  0.315  0.758  1.0
  O  O28  1  0.516  0.302  0.511  1.0
  O  O29  1  0.749  0.313  0.256  1.0
  O  O30  1  0.152  0.788  0.492  1.0
  O  O31  1  0.319  0.919  0.210  1.0
  O  O32  1  0.207  0.435  0.479  1.0
  O  O33  1  0.099  0.739  0.242  1.0
  O  O34  1  0.305  0.561  0.017  1.0
  O  O35  1  0.282  0.186  0.314  1.0
  O  O36  1  0.347  0.205  0.010  1.0
  O  O37  1  0.016  0.314  0.016  1.0
[/CIF]
.