The material structure described by Sr2VAs2O9 is Esseneite-like structured and crystallizes in the monoclinic Cc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), two equivalent O(8), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. V(1) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(3) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent As(1)O4 tetrahedra, and corners with two equivalent As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 37°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the second As site, As(2) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form AsO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-49°. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(2) atom. In the second O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(2) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one As(1) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one As(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent V(1) atoms. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one As(1) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one As(1) atom. In the eighth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one As(2) atom. In the ninth O site, O(7) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one As(2) atom. is represented by the CIF card [CIF]
data_Sr2VAs2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.110
_cell_length_b   9.110
_cell_length_c   7.011
_cell_angle_alpha   77.759
_cell_angle_beta   77.759
_cell_angle_gamma   130.550
_symmetry_Int_Tables_number   1
_cell_volume   381.096
_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  0.043  0.955  0.251  1.0
  Sr  Sr1  1  0.955  0.043  0.751  1.0
  Sr  Sr2  1  0.625  0.377  0.250  1.0
  Sr  Sr3  1  0.377  0.625  0.750  1.0
  V  V4  1  0.469  0.978  0.025  1.0
  V  V5  1  0.978  0.469  0.525  1.0
  As  As6  1  0.422  0.577  0.251  1.0
  As  As7  1  0.577  0.422  0.751  1.0
  As  As8  1  0.837  0.161  0.250  1.0
  As  As9  1  0.161  0.837  0.750  1.0
  O  O10  1  0.227  0.505  0.485  1.0
  O  O11  1  0.494  0.773  0.019  1.0
  O  O12  1  0.773  0.494  0.519  1.0
  O  O13  1  0.505  0.227  0.985  1.0
  O  O14  1  0.212  0.786  0.246  1.0
  O  O15  1  0.786  0.212  0.746  1.0
  O  O16  1  0.652  0.692  0.271  1.0
  O  O17  1  0.307  0.347  0.229  1.0
  O  O18  1  0.347  0.307  0.729  1.0
  O  O19  1  0.692  0.652  0.771  1.0
  O  O20  1  0.394  0.938  0.773  1.0
  O  O21  1  0.063  0.604  0.732  1.0
  O  O22  1  0.604  0.063  0.232  1.0
  O  O23  1  0.938  0.394  0.273  1.0
  O  O24  1  0.986  0.784  0.978  1.0
  O  O25  1  0.216  0.013  0.521  1.0
  O  O26  1  0.013  0.216  0.021  1.0
  O  O27  1  0.784  0.986  0.478  1.0
[/CIF]
.
The material structure described by Sr2VAs2O9 is Esseneite-like structured and crystallizes in the monoclinic Cc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), two equivalent O(8), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. V(1) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(3) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent As(1)O4 tetrahedra, and corners with two equivalent As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 37°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the second As site, As(2) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form AsO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-49°. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(2) atom. In the second O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(2) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one As(1) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one As(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent V(1) atoms. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one As(1) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one As(1) atom. In the eighth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one As(2) atom. In the ninth O site, O(7) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one As(2) atom. is represented by the CIF card [CIF]
data_Sr2VAs2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.110
_cell_length_b   9.110
_cell_length_c   7.011
_cell_angle_alpha   77.759
_cell_angle_beta   77.759
_cell_angle_gamma   130.550
_symmetry_Int_Tables_number   1
_cell_volume   381.096
_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  0.043  0.955  0.251  1.0
  Sr  Sr1  1  0.955  0.043  0.751  1.0
  Sr  Sr2  1  0.625  0.377  0.250  1.0
  Sr  Sr3  1  0.377  0.625  0.750  1.0
  V  V4  1  0.469  0.978  0.025  1.0
  V  V5  1  0.978  0.469  0.525  1.0
  As  As6  1  0.422  0.577  0.251  1.0
  As  As7  1  0.577  0.422  0.751  1.0
  As  As8  1  0.837  0.161  0.250  1.0
  As  As9  1  0.161  0.837  0.750  1.0
  O  O10  1  0.227  0.505  0.485  1.0
  O  O11  1  0.494  0.773  0.019  1.0
  O  O12  1  0.773  0.494  0.519  1.0
  O  O13  1  0.505  0.227  0.985  1.0
  O  O14  1  0.212  0.786  0.246  1.0
  O  O15  1  0.786  0.212  0.746  1.0
  O  O16  1  0.652  0.692  0.271  1.0
  O  O17  1  0.307  0.347  0.229  1.0
  O  O18  1  0.347  0.307  0.729  1.0
  O  O19  1  0.692  0.652  0.771  1.0
  O  O20  1  0.394  0.938  0.773  1.0
  O  O21  1  0.063  0.604  0.732  1.0
  O  O22  1  0.604  0.063  0.232  1.0
  O  O23  1  0.938  0.394  0.273  1.0
  O  O24  1  0.986  0.784  0.978  1.0
  O  O25  1  0.216  0.013  0.521  1.0
  O  O26  1  0.013  0.216  0.021  1.0
  O  O27  1  0.784  0.986  0.478  1.0
[/CIF]
.