The compound described by Sr3(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(7), and two equivalent O(6) atoms. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(7), two equivalent O(4), and two equivalent O(8) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second As site, As(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Sr(2), one Sr(3), and one As(2) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Sr(3) and one As(2) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(1) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(3), two equivalent Sr(1), and one As(1) atom. In the fifth 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 sixth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(3), and one As(1) atom. In the seventh O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), and one As(2) atom. In the eighth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one As(2) 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   12.354
_cell_length_b   7.159
_cell_length_c   9.962
_cell_angle_alpha   82.906
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   874.343
_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
  Sr  Sr0  1  0.379  0.320  0.053  1.0
  Sr  Sr1  1  0.121  0.820  0.053  1.0
  Sr  Sr2  1  0.101  0.335  0.297  1.0
  Sr  Sr3  1  0.672  0.372  0.331  1.0
  Sr  Sr4  1  0.399  0.835  0.297  1.0
  Sr  Sr5  1  0.828  0.872  0.331  1.0
  Sr  Sr6  1  0.172  0.128  0.669  1.0
  Sr  Sr7  1  0.601  0.165  0.703  1.0
  Sr  Sr8  1  0.328  0.628  0.669  1.0
  Sr  Sr9  1  0.899  0.665  0.703  1.0
  Sr  Sr10  1  0.879  0.180  0.947  1.0
  Sr  Sr11  1  0.621  0.680  0.947  1.0
  As  As12  1  0.637  0.106  0.079  1.0
  As  As13  1  0.863  0.606  0.079  1.0
  As  As14  1  0.397  0.314  0.399  1.0
  As  As15  1  0.103  0.814  0.399  1.0
  As  As16  1  0.897  0.186  0.601  1.0
  As  As17  1  0.603  0.686  0.601  1.0
  As  As18  1  0.137  0.394  0.921  1.0
  As  As19  1  0.363  0.894  0.921  1.0
  O  O20  1  0.189  0.449  0.072  1.0
  O  O21  1  0.578  0.326  0.069  1.0
  O  O22  1  0.311  0.949  0.072  1.0
  O  O23  1  0.945  0.425  0.143  1.0
  O  O24  1  0.922  0.826  0.069  1.0
  O  O25  1  0.749  0.132  0.180  1.0
  O  O26  1  0.555  0.925  0.143  1.0
  O  O27  1  0.062  0.000  0.283  1.0
  O  O28  1  0.751  0.632  0.180  1.0
  O  O29  1  0.334  0.165  0.300  1.0
  O  O30  1  0.438  0.500  0.283  1.0
  O  O31  1  0.166  0.665  0.300  1.0
  O  O32  1  0.516  0.223  0.471  1.0
  O  O33  1  0.804  0.136  0.481  1.0
  O  O34  1  0.984  0.723  0.471  1.0
  O  O35  1  0.696  0.636  0.481  1.0
  O  O36  1  0.304  0.364  0.519  1.0
  O  O37  1  0.016  0.277  0.529  1.0
  O  O38  1  0.196  0.864  0.519  1.0
  O  O39  1  0.484  0.777  0.529  1.0
  O  O40  1  0.834  0.335  0.700  1.0
  O  O41  1  0.562  0.500  0.717  1.0
  O  O42  1  0.666  0.835  0.700  1.0
  O  O43  1  0.249  0.368  0.820  1.0
  O  O44  1  0.938  1.000  0.717  1.0
  O  O45  1  0.445  0.075  0.857  1.0
  O  O46  1  0.251  0.868  0.820  1.0
  O  O47  1  0.078  0.174  0.931  1.0
  O  O48  1  0.055  0.575  0.857  1.0
  O  O49  1  0.689  0.051  0.928  1.0
  O  O50  1  0.422  0.674  0.931  1.0
  O  O51  1  0.811  0.551  0.928  1.0
[/CIF]
.
The compound described by Sr3(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(7), and two equivalent O(6) atoms. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(7), two equivalent O(4), and two equivalent O(8) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second As site, As(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Sr(2), one Sr(3), and one As(2) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Sr(3) and one As(2) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(1) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(3), two equivalent Sr(1), and one As(1) atom. In the fifth 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 sixth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(3), and one As(1) atom. In the seventh O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), and one As(2) atom. In the eighth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one As(2) 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   12.354
_cell_length_b   7.159
_cell_length_c   9.962
_cell_angle_alpha   82.906
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   874.343
_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
  Sr  Sr0  1  0.379  0.320  0.053  1.0
  Sr  Sr1  1  0.121  0.820  0.053  1.0
  Sr  Sr2  1  0.101  0.335  0.297  1.0
  Sr  Sr3  1  0.672  0.372  0.331  1.0
  Sr  Sr4  1  0.399  0.835  0.297  1.0
  Sr  Sr5  1  0.828  0.872  0.331  1.0
  Sr  Sr6  1  0.172  0.128  0.669  1.0
  Sr  Sr7  1  0.601  0.165  0.703  1.0
  Sr  Sr8  1  0.328  0.628  0.669  1.0
  Sr  Sr9  1  0.899  0.665  0.703  1.0
  Sr  Sr10  1  0.879  0.180  0.947  1.0
  Sr  Sr11  1  0.621  0.680  0.947  1.0
  As  As12  1  0.637  0.106  0.079  1.0
  As  As13  1  0.863  0.606  0.079  1.0
  As  As14  1  0.397  0.314  0.399  1.0
  As  As15  1  0.103  0.814  0.399  1.0
  As  As16  1  0.897  0.186  0.601  1.0
  As  As17  1  0.603  0.686  0.601  1.0
  As  As18  1  0.137  0.394  0.921  1.0
  As  As19  1  0.363  0.894  0.921  1.0
  O  O20  1  0.189  0.449  0.072  1.0
  O  O21  1  0.578  0.326  0.069  1.0
  O  O22  1  0.311  0.949  0.072  1.0
  O  O23  1  0.945  0.425  0.143  1.0
  O  O24  1  0.922  0.826  0.069  1.0
  O  O25  1  0.749  0.132  0.180  1.0
  O  O26  1  0.555  0.925  0.143  1.0
  O  O27  1  0.062  0.000  0.283  1.0
  O  O28  1  0.751  0.632  0.180  1.0
  O  O29  1  0.334  0.165  0.300  1.0
  O  O30  1  0.438  0.500  0.283  1.0
  O  O31  1  0.166  0.665  0.300  1.0
  O  O32  1  0.516  0.223  0.471  1.0
  O  O33  1  0.804  0.136  0.481  1.0
  O  O34  1  0.984  0.723  0.471  1.0
  O  O35  1  0.696  0.636  0.481  1.0
  O  O36  1  0.304  0.364  0.519  1.0
  O  O37  1  0.016  0.277  0.529  1.0
  O  O38  1  0.196  0.864  0.519  1.0
  O  O39  1  0.484  0.777  0.529  1.0
  O  O40  1  0.834  0.335  0.700  1.0
  O  O41  1  0.562  0.500  0.717  1.0
  O  O42  1  0.666  0.835  0.700  1.0
  O  O43  1  0.249  0.368  0.820  1.0
  O  O44  1  0.938  1.000  0.717  1.0
  O  O45  1  0.445  0.075  0.857  1.0
  O  O46  1  0.251  0.868  0.820  1.0
  O  O47  1  0.078  0.174  0.931  1.0
  O  O48  1  0.055  0.575  0.857  1.0
  O  O49  1  0.689  0.051  0.928  1.0
  O  O50  1  0.422  0.674  0.931  1.0
  O  O51  1  0.811  0.551  0.928  1.0
[/CIF]
.