The compound described by Sr3(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form SrO6 octahedra that share corners with six equivalent As(1)O4 tetrahedra. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-50°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Sr(2) and one As(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.422
_cell_length_b   5.997
_cell_length_c   9.419
_cell_angle_alpha   50.942
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   457.103
_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  0.000  0.500  0.500  1.0
  Sr  Sr1  1  0.359  0.342  0.679  1.0
  Sr  Sr2  1  0.859  0.658  0.821  1.0
  Sr  Sr3  1  0.500  0.500  0.000  1.0
  Sr  Sr4  1  0.141  0.342  0.179  1.0
  Sr  Sr5  1  0.641  0.658  0.321  1.0
  As  As6  1  0.305  0.826  0.175  1.0
  As  As7  1  0.805  0.174  0.325  1.0
  As  As8  1  0.195  0.826  0.675  1.0
  As  As9  1  0.695  0.174  0.825  1.0
  O  O10  1  0.850  0.285  0.775  1.0
  O  O11  1  0.406  0.601  0.352  1.0
  O  O12  1  0.651  0.172  0.001  1.0
  O  O13  1  0.821  0.840  0.390  1.0
  O  O14  1  0.151  0.828  0.499  1.0
  O  O15  1  0.350  0.715  0.725  1.0
  O  O16  1  0.321  0.160  0.110  1.0
  O  O17  1  0.906  0.399  0.148  1.0
  O  O18  1  0.094  0.601  0.852  1.0
  O  O19  1  0.679  0.840  0.890  1.0
  O  O20  1  0.650  0.285  0.275  1.0
  O  O21  1  0.849  0.172  0.501  1.0
  O  O22  1  0.179  0.160  0.610  1.0
  O  O23  1  0.349  0.828  0.999  1.0
  O  O24  1  0.594  0.399  0.648  1.0
  O  O25  1  0.150  0.715  0.225  1.0
[/CIF]
.
The compound described by Sr3(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form SrO6 octahedra that share corners with six equivalent As(1)O4 tetrahedra. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-50°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Sr(2) and one As(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.422
_cell_length_b   5.997
_cell_length_c   9.419
_cell_angle_alpha   50.942
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   457.103
_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  0.000  0.500  0.500  1.0
  Sr  Sr1  1  0.359  0.342  0.679  1.0
  Sr  Sr2  1  0.859  0.658  0.821  1.0
  Sr  Sr3  1  0.500  0.500  0.000  1.0
  Sr  Sr4  1  0.141  0.342  0.179  1.0
  Sr  Sr5  1  0.641  0.658  0.321  1.0
  As  As6  1  0.305  0.826  0.175  1.0
  As  As7  1  0.805  0.174  0.325  1.0
  As  As8  1  0.195  0.826  0.675  1.0
  As  As9  1  0.695  0.174  0.825  1.0
  O  O10  1  0.850  0.285  0.775  1.0
  O  O11  1  0.406  0.601  0.352  1.0
  O  O12  1  0.651  0.172  0.001  1.0
  O  O13  1  0.821  0.840  0.390  1.0
  O  O14  1  0.151  0.828  0.499  1.0
  O  O15  1  0.350  0.715  0.725  1.0
  O  O16  1  0.321  0.160  0.110  1.0
  O  O17  1  0.906  0.399  0.148  1.0
  O  O18  1  0.094  0.601  0.852  1.0
  O  O19  1  0.679  0.840  0.890  1.0
  O  O20  1  0.650  0.285  0.275  1.0
  O  O21  1  0.849  0.172  0.501  1.0
  O  O22  1  0.179  0.160  0.610  1.0
  O  O23  1  0.349  0.828  0.999  1.0
  O  O24  1  0.594  0.399  0.648  1.0
  O  O25  1  0.150  0.715  0.225  1.0
[/CIF]
.