The compound described by SrCdAs2O7 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), one O(7), two equivalent O(4), and three equivalent O(2) atoms. Cd(1) is bonded to one O(1), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form distorted CdO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with four equivalent As(2)O4 tetrahedra, and  an edgeedge with one Cd(1)O6 octahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 61-63°. 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 corners with four equivalent Cd(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-63°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(1), one Cd(1), and one As(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to three equivalent Sr(1) and one As(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Cd(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Cd(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one As(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one As(1) atom. is represented by the CIF file [CIF]
data_SrCdAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.898
_cell_length_b   7.284
_cell_length_c   7.627
_cell_angle_alpha   101.166
_cell_angle_beta   90.364
_cell_angle_gamma   98.717
_symmetry_Int_Tables_number   1
_cell_volume   317.544
_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
  Sr  Sr0  1  0.690  0.275  0.936  1.0
  Sr  Sr1  1  0.310  0.725  0.064  1.0
  Cd  Cd2  1  0.316  0.832  0.601  1.0
  Cd  Cd3  1  0.684  0.168  0.399  1.0
  As  As4  1  0.817  0.779  0.821  1.0
  As  As5  1  0.183  0.221  0.179  1.0
  As  As6  1  0.792  0.669  0.386  1.0
  As  As7  1  0.208  0.331  0.614  1.0
  O  O8  1  0.934  0.225  0.641  1.0
  O  O9  1  0.066  0.775  0.359  1.0
  O  O10  1  0.768  0.634  0.970  1.0
  O  O11  1  0.232  0.366  0.030  1.0
  O  O12  1  0.787  0.619  0.608  1.0
  O  O13  1  0.213  0.381  0.392  1.0
  O  O14  1  0.606  0.917  0.823  1.0
  O  O15  1  0.394  0.083  0.177  1.0
  O  O16  1  0.588  0.816  0.376  1.0
  O  O17  1  0.412  0.184  0.624  1.0
  O  O18  1  0.286  0.554  0.732  1.0
  O  O19  1  0.714  0.446  0.268  1.0
  O  O20  1  0.092  0.897  0.840  1.0
  O  O21  1  0.908  0.103  0.160  1.0
[/CIF]
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The compound described by SrCdAs2O7 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), one O(7), two equivalent O(4), and three equivalent O(2) atoms. Cd(1) is bonded to one O(1), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form distorted CdO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with four equivalent As(2)O4 tetrahedra, and  an edgeedge with one Cd(1)O6 octahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 61-63°. 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 corners with four equivalent Cd(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-63°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(1), one Cd(1), and one As(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to three equivalent Sr(1) and one As(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Cd(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Cd(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one As(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one As(1) atom. is represented by the CIF file [CIF]
data_SrCdAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.898
_cell_length_b   7.284
_cell_length_c   7.627
_cell_angle_alpha   101.166
_cell_angle_beta   90.364
_cell_angle_gamma   98.717
_symmetry_Int_Tables_number   1
_cell_volume   317.544
_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
  Sr  Sr0  1  0.690  0.275  0.936  1.0
  Sr  Sr1  1  0.310  0.725  0.064  1.0
  Cd  Cd2  1  0.316  0.832  0.601  1.0
  Cd  Cd3  1  0.684  0.168  0.399  1.0
  As  As4  1  0.817  0.779  0.821  1.0
  As  As5  1  0.183  0.221  0.179  1.0
  As  As6  1  0.792  0.669  0.386  1.0
  As  As7  1  0.208  0.331  0.614  1.0
  O  O8  1  0.934  0.225  0.641  1.0
  O  O9  1  0.066  0.775  0.359  1.0
  O  O10  1  0.768  0.634  0.970  1.0
  O  O11  1  0.232  0.366  0.030  1.0
  O  O12  1  0.787  0.619  0.608  1.0
  O  O13  1  0.213  0.381  0.392  1.0
  O  O14  1  0.606  0.917  0.823  1.0
  O  O15  1  0.394  0.083  0.177  1.0
  O  O16  1  0.588  0.816  0.376  1.0
  O  O17  1  0.412  0.184  0.624  1.0
  O  O18  1  0.286  0.554  0.732  1.0
  O  O19  1  0.714  0.446  0.268  1.0
  O  O20  1  0.092  0.897  0.840  1.0
  O  O21  1  0.908  0.103  0.160  1.0
[/CIF]
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