The material structure described by Sr3(AsO4)2 crystallizes in the trigonal R-3m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(2) and nine equivalent O(1) atoms. As(1) is bonded in a tetrahedral geometry to one O(2) and three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), three equivalent Sr(2), and one As(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Sr(2) and one As(1) atom. is represented by the CIF card [CIF]
data_Sr3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.438
_cell_length_b   7.438
_cell_length_c   7.438
_cell_angle_alpha   44.200
_cell_angle_beta   44.200
_cell_angle_gamma   44.200
_symmetry_Int_Tables_number   1
_cell_volume   181.736
_cell_formula_units_Z   1
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  1.000  1.000  1.0
  Sr  Sr1  1  0.203  0.203  0.203  1.0
  Sr  Sr2  1  0.797  0.797  0.797  1.0
  As  As3  1  0.594  0.594  0.594  1.0
  As  As4  1  0.406  0.406  0.406  1.0
  O  O5  1  0.269  0.765  0.269  1.0
  O  O6  1  0.235  0.731  0.731  1.0
  O  O7  1  0.677  0.678  0.678  1.0
  O  O8  1  0.322  0.323  0.322  1.0
  O  O9  1  0.731  0.731  0.235  1.0
  O  O10  1  0.269  0.269  0.765  1.0
  O  O11  1  0.765  0.269  0.269  1.0
  O  O12  1  0.731  0.235  0.731  1.0
[/CIF]
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The material structure described by Sr3(AsO4)2 crystallizes in the trigonal R-3m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(2) and nine equivalent O(1) atoms. As(1) is bonded in a tetrahedral geometry to one O(2) and three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), three equivalent Sr(2), and one As(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Sr(2) and one As(1) atom. is represented by the CIF card [CIF]
data_Sr3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.438
_cell_length_b   7.438
_cell_length_c   7.438
_cell_angle_alpha   44.200
_cell_angle_beta   44.200
_cell_angle_gamma   44.200
_symmetry_Int_Tables_number   1
_cell_volume   181.736
_cell_formula_units_Z   1
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  1.000  1.000  1.0
  Sr  Sr1  1  0.203  0.203  0.203  1.0
  Sr  Sr2  1  0.797  0.797  0.797  1.0
  As  As3  1  0.594  0.594  0.594  1.0
  As  As4  1  0.406  0.406  0.406  1.0
  O  O5  1  0.269  0.765  0.269  1.0
  O  O6  1  0.235  0.731  0.731  1.0
  O  O7  1  0.677  0.678  0.678  1.0
  O  O8  1  0.322  0.323  0.322  1.0
  O  O9  1  0.731  0.731  0.235  1.0
  O  O10  1  0.269  0.269  0.765  1.0
  O  O11  1  0.765  0.269  0.269  1.0
  O  O12  1  0.731  0.235  0.731  1.0
[/CIF]
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