The material described by BaZnAs2O7 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded in a 9-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Zn(1) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form ZnO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one As(2)O4 tetrahedra and corners with two equivalent Zn(1)O5 trigonal bipyramids. In the second As site, As(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra and corners with three equivalent Zn(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Zn(1), and one As(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one Zn(1), and one As(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ba(1), one Zn(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Zn(1), and one As(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ba(1), one Zn(1), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_BaZnAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.691
_cell_length_b   5.746
_cell_length_c   14.747
_cell_angle_alpha   67.225
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   679.024
_cell_formula_units_Z   4
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  0.346  0.500  0.285  1.0
  Ba  Ba1  1  0.846  0.500  0.215  1.0
  Ba  Ba2  1  0.654  0.500  0.715  1.0
  Ba  Ba3  1  0.154  0.500  0.785  1.0
  Zn  Zn4  1  0.851  0.781  0.888  1.0
  Zn  Zn5  1  0.351  0.219  0.612  1.0
  Zn  Zn6  1  0.649  0.781  0.388  1.0
  Zn  Zn7  1  0.149  0.219  0.112  1.0
  As  As8  1  0.967  0.093  0.658  1.0
  As  As9  1  0.315  0.841  0.487  1.0
  As  As10  1  0.467  0.907  0.842  1.0
  As  As11  1  0.533  0.093  0.158  1.0
  As  As12  1  0.815  0.159  0.013  1.0
  As  As13  1  0.185  0.841  0.987  1.0
  As  As14  1  0.033  0.907  0.342  1.0
  As  As15  1  0.685  0.159  0.513  1.0
  O  O16  1  0.613  0.175  0.037  1.0
  O  O17  1  0.379  0.178  0.764  1.0
  O  O18  1  0.113  0.825  0.463  1.0
  O  O19  1  0.164  0.591  0.097  1.0
  O  O20  1  0.440  0.660  0.808  1.0
  O  O21  1  0.151  0.137  0.984  1.0
  O  O22  1  0.591  0.196  0.609  1.0
  O  O23  1  0.879  0.822  0.736  1.0
  O  O24  1  0.664  0.409  0.403  1.0
  O  O25  1  0.651  0.863  0.516  1.0
  O  O26  1  0.409  0.804  0.391  1.0
  O  O27  1  0.560  0.340  0.192  1.0
  O  O28  1  0.836  0.409  0.903  1.0
  O  O29  1  0.887  0.175  0.537  1.0
  O  O30  1  0.387  0.825  0.963  1.0
  O  O31  1  0.654  0.983  0.851  1.0
  O  O32  1  0.846  0.983  0.351  1.0
  O  O33  1  0.621  0.822  0.236  1.0
  O  O34  1  0.154  0.017  0.649  1.0
  O  O35  1  0.060  0.660  0.308  1.0
  O  O36  1  0.346  0.017  0.149  1.0
  O  O37  1  0.940  0.340  0.692  1.0
  O  O38  1  0.909  0.196  0.109  1.0
  O  O39  1  0.091  0.804  0.891  1.0
  O  O40  1  0.349  0.137  0.484  1.0
  O  O41  1  0.121  0.178  0.264  1.0
  O  O42  1  0.336  0.591  0.597  1.0
  O  O43  1  0.849  0.863  0.016  1.0
[/CIF]
.
The material described by BaZnAs2O7 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded in a 9-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Zn(1) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form ZnO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one As(2)O4 tetrahedra and corners with two equivalent Zn(1)O5 trigonal bipyramids. In the second As site, As(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra and corners with three equivalent Zn(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Zn(1), and one As(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one Zn(1), and one As(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ba(1), one Zn(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Zn(1), and one As(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ba(1), one Zn(1), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_BaZnAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.691
_cell_length_b   5.746
_cell_length_c   14.747
_cell_angle_alpha   67.225
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   679.024
_cell_formula_units_Z   4
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  0.346  0.500  0.285  1.0
  Ba  Ba1  1  0.846  0.500  0.215  1.0
  Ba  Ba2  1  0.654  0.500  0.715  1.0
  Ba  Ba3  1  0.154  0.500  0.785  1.0
  Zn  Zn4  1  0.851  0.781  0.888  1.0
  Zn  Zn5  1  0.351  0.219  0.612  1.0
  Zn  Zn6  1  0.649  0.781  0.388  1.0
  Zn  Zn7  1  0.149  0.219  0.112  1.0
  As  As8  1  0.967  0.093  0.658  1.0
  As  As9  1  0.315  0.841  0.487  1.0
  As  As10  1  0.467  0.907  0.842  1.0
  As  As11  1  0.533  0.093  0.158  1.0
  As  As12  1  0.815  0.159  0.013  1.0
  As  As13  1  0.185  0.841  0.987  1.0
  As  As14  1  0.033  0.907  0.342  1.0
  As  As15  1  0.685  0.159  0.513  1.0
  O  O16  1  0.613  0.175  0.037  1.0
  O  O17  1  0.379  0.178  0.764  1.0
  O  O18  1  0.113  0.825  0.463  1.0
  O  O19  1  0.164  0.591  0.097  1.0
  O  O20  1  0.440  0.660  0.808  1.0
  O  O21  1  0.151  0.137  0.984  1.0
  O  O22  1  0.591  0.196  0.609  1.0
  O  O23  1  0.879  0.822  0.736  1.0
  O  O24  1  0.664  0.409  0.403  1.0
  O  O25  1  0.651  0.863  0.516  1.0
  O  O26  1  0.409  0.804  0.391  1.0
  O  O27  1  0.560  0.340  0.192  1.0
  O  O28  1  0.836  0.409  0.903  1.0
  O  O29  1  0.887  0.175  0.537  1.0
  O  O30  1  0.387  0.825  0.963  1.0
  O  O31  1  0.654  0.983  0.851  1.0
  O  O32  1  0.846  0.983  0.351  1.0
  O  O33  1  0.621  0.822  0.236  1.0
  O  O34  1  0.154  0.017  0.649  1.0
  O  O35  1  0.060  0.660  0.308  1.0
  O  O36  1  0.346  0.017  0.149  1.0
  O  O37  1  0.940  0.340  0.692  1.0
  O  O38  1  0.909  0.196  0.109  1.0
  O  O39  1  0.091  0.804  0.891  1.0
  O  O40  1  0.349  0.137  0.484  1.0
  O  O41  1  0.121  0.178  0.264  1.0
  O  O42  1  0.336  0.591  0.597  1.0
  O  O43  1  0.849  0.863  0.016  1.0
[/CIF]
.