The crystal structure described by Na2CrCAsO7 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. Cr(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. As(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-55°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Cr(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to two equivalent Na(1), one Cr(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Cr(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to two equivalent Na(1), one Cr(1), and one As(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Cr(1), and one As(1) atom. is represented by the CIF card [CIF]
data_Na2CrAsCO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.127
_cell_length_b   6.742
_cell_length_c   5.358
_cell_angle_alpha   89.999
_cell_angle_beta   87.771
_cell_angle_gamma   90.002
_symmetry_Int_Tables_number   1
_cell_volume   329.422
_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
  Na  Na0  1  0.222  0.002  0.236  1.0
  Na  Na1  1  0.222  0.498  0.236  1.0
  Na  Na2  1  0.778  0.502  0.764  1.0
  Na  Na3  1  0.778  0.998  0.764  1.0
  Cr  Cr4  1  0.344  0.750  0.789  1.0
  Cr  Cr5  1  0.655  0.250  0.211  1.0
  As  As6  1  0.425  0.250  0.715  1.0
  As  As7  1  0.575  0.750  0.285  1.0
  C  C8  1  0.079  0.750  0.722  1.0
  C  C9  1  0.921  0.250  0.278  1.0
  O  O10  1  0.056  0.250  0.311  1.0
  O  O11  1  0.137  0.750  0.944  1.0
  O  O12  1  0.180  0.750  0.537  1.0
  O  O13  1  0.321  0.048  0.804  1.0
  O  O14  1  0.321  0.452  0.804  1.0
  O  O15  1  0.409  0.750  0.146  1.0
  O  O16  1  0.455  0.250  0.392  1.0
  O  O17  1  0.545  0.750  0.608  1.0
  O  O18  1  0.591  0.250  0.854  1.0
  O  O19  1  0.679  0.548  0.196  1.0
  O  O20  1  0.679  0.952  0.196  1.0
  O  O21  1  0.820  0.250  0.463  1.0
  O  O22  1  0.863  0.250  0.056  1.0
  O  O23  1  0.944  0.750  0.689  1.0
[/CIF]
.
The crystal structure described by Na2CrCAsO7 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. Cr(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. As(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-55°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Cr(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to two equivalent Na(1), one Cr(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Cr(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to two equivalent Na(1), one Cr(1), and one As(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Cr(1), and one As(1) atom. is represented by the CIF card [CIF]
data_Na2CrAsCO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.127
_cell_length_b   6.742
_cell_length_c   5.358
_cell_angle_alpha   89.999
_cell_angle_beta   87.771
_cell_angle_gamma   90.002
_symmetry_Int_Tables_number   1
_cell_volume   329.422
_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
  Na  Na0  1  0.222  0.002  0.236  1.0
  Na  Na1  1  0.222  0.498  0.236  1.0
  Na  Na2  1  0.778  0.502  0.764  1.0
  Na  Na3  1  0.778  0.998  0.764  1.0
  Cr  Cr4  1  0.344  0.750  0.789  1.0
  Cr  Cr5  1  0.655  0.250  0.211  1.0
  As  As6  1  0.425  0.250  0.715  1.0
  As  As7  1  0.575  0.750  0.285  1.0
  C  C8  1  0.079  0.750  0.722  1.0
  C  C9  1  0.921  0.250  0.278  1.0
  O  O10  1  0.056  0.250  0.311  1.0
  O  O11  1  0.137  0.750  0.944  1.0
  O  O12  1  0.180  0.750  0.537  1.0
  O  O13  1  0.321  0.048  0.804  1.0
  O  O14  1  0.321  0.452  0.804  1.0
  O  O15  1  0.409  0.750  0.146  1.0
  O  O16  1  0.455  0.250  0.392  1.0
  O  O17  1  0.545  0.750  0.608  1.0
  O  O18  1  0.591  0.250  0.854  1.0
  O  O19  1  0.679  0.548  0.196  1.0
  O  O20  1  0.679  0.952  0.196  1.0
  O  O21  1  0.820  0.250  0.463  1.0
  O  O22  1  0.863  0.250  0.056  1.0
  O  O23  1  0.944  0.750  0.689  1.0
[/CIF]
.