The crystal structure described by Rb2AgI3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one I(3), two equivalent I(2), and four equivalent I(1) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one I(1), three equivalent I(2), and three equivalent I(3) atoms. Ag(1) is bonded to one I(1), one I(2), and two equivalent I(3) atoms to form corner-sharing AgI4 tetrahedra. There are three inequivalent I sites. In the first I site, I(1) is bonded to one Rb(2), four equivalent Rb(1), and one Ag(1) atom to form IRb5Ag octahedra that share  a cornercorner with one I(3)Rb4Ag2 octahedra, corners with four equivalent I(1)Rb5Ag octahedra, corners with six equivalent I(2)Rb5Ag octahedra, edges with four equivalent I(3)Rb4Ag2 octahedra, edges with four equivalent I(1)Rb5Ag octahedra, and faces with two equivalent I(2)Rb5Ag octahedra. The corner-sharing octahedral tilt angles range from 24-58°. In the second I site, I(2) is bonded to two equivalent Rb(1), three equivalent Rb(2), and one Ag(1) atom to form distorted IRb5Ag octahedra that share corners with six equivalent I(1)Rb5Ag octahedra, corners with seven equivalent I(3)Rb4Ag2 octahedra, edges with three equivalent I(3)Rb4Ag2 octahedra, edges with four equivalent I(2)Rb5Ag octahedra, and faces with two equivalent I(1)Rb5Ag octahedra. The corner-sharing octahedral tilt angles range from 25-58°. In the third I site, I(3) is bonded to one Rb(1), three equivalent Rb(2), and two equivalent Ag(1) atoms to form distorted IRb4Ag2 octahedra that share  a cornercorner with one I(1)Rb5Ag octahedra, corners with seven equivalent I(2)Rb5Ag octahedra, edges with three equivalent I(2)Rb5Ag octahedra, edges with four equivalent I(3)Rb4Ag2 octahedra, and edges with four equivalent I(1)Rb5Ag octahedra. The corner-sharing octahedral tilt angles range from 25-51°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2AgI3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.933
_cell_length_b   10.372
_cell_length_c   20.101
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1028.427
_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
  Rb  Rb0  1  0.750  0.920  0.712  1.0
  Rb  Rb1  1  0.250  0.080  0.288  1.0
  Rb  Rb2  1  0.750  0.420  0.788  1.0
  Rb  Rb3  1  0.250  0.580  0.212  1.0
  Rb  Rb4  1  0.750  0.244  0.042  1.0
  Rb  Rb5  1  0.250  0.756  0.958  1.0
  Rb  Rb6  1  0.750  0.744  0.458  1.0
  Rb  Rb7  1  0.250  0.256  0.542  1.0
  Ag  Ag8  1  0.750  0.363  0.364  1.0
  Ag  Ag9  1  0.250  0.637  0.636  1.0
  Ag  Ag10  1  0.750  0.863  0.136  1.0
  Ag  Ag11  1  0.250  0.137  0.864  1.0
  I  I12  1  0.750  0.314  0.223  1.0
  I  I13  1  0.250  0.686  0.777  1.0
  I  I14  1  0.750  0.814  0.277  1.0
  I  I15  1  0.250  0.186  0.723  1.0
  I  I16  1  0.750  0.120  0.429  1.0
  I  I17  1  0.250  0.880  0.571  1.0
  I  I18  1  0.750  0.620  0.071  1.0
  I  I19  1  0.250  0.380  0.929  1.0
  I  I20  1  0.750  0.005  0.897  1.0
  I  I21  1  0.250  0.995  0.103  1.0
  I  I22  1  0.750  0.505  0.603  1.0
  I  I23  1  0.250  0.495  0.397  1.0
[/CIF]
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The crystal structure described by Rb2AgI3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one I(3), two equivalent I(2), and four equivalent I(1) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one I(1), three equivalent I(2), and three equivalent I(3) atoms. Ag(1) is bonded to one I(1), one I(2), and two equivalent I(3) atoms to form corner-sharing AgI4 tetrahedra. There are three inequivalent I sites. In the first I site, I(1) is bonded to one Rb(2), four equivalent Rb(1), and one Ag(1) atom to form IRb5Ag octahedra that share  a cornercorner with one I(3)Rb4Ag2 octahedra, corners with four equivalent I(1)Rb5Ag octahedra, corners with six equivalent I(2)Rb5Ag octahedra, edges with four equivalent I(3)Rb4Ag2 octahedra, edges with four equivalent I(1)Rb5Ag octahedra, and faces with two equivalent I(2)Rb5Ag octahedra. The corner-sharing octahedral tilt angles range from 24-58°. In the second I site, I(2) is bonded to two equivalent Rb(1), three equivalent Rb(2), and one Ag(1) atom to form distorted IRb5Ag octahedra that share corners with six equivalent I(1)Rb5Ag octahedra, corners with seven equivalent I(3)Rb4Ag2 octahedra, edges with three equivalent I(3)Rb4Ag2 octahedra, edges with four equivalent I(2)Rb5Ag octahedra, and faces with two equivalent I(1)Rb5Ag octahedra. The corner-sharing octahedral tilt angles range from 25-58°. In the third I site, I(3) is bonded to one Rb(1), three equivalent Rb(2), and two equivalent Ag(1) atoms to form distorted IRb4Ag2 octahedra that share  a cornercorner with one I(1)Rb5Ag octahedra, corners with seven equivalent I(2)Rb5Ag octahedra, edges with three equivalent I(2)Rb5Ag octahedra, edges with four equivalent I(3)Rb4Ag2 octahedra, and edges with four equivalent I(1)Rb5Ag octahedra. The corner-sharing octahedral tilt angles range from 25-51°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2AgI3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.933
_cell_length_b   10.372
_cell_length_c   20.101
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1028.427
_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
  Rb  Rb0  1  0.750  0.920  0.712  1.0
  Rb  Rb1  1  0.250  0.080  0.288  1.0
  Rb  Rb2  1  0.750  0.420  0.788  1.0
  Rb  Rb3  1  0.250  0.580  0.212  1.0
  Rb  Rb4  1  0.750  0.244  0.042  1.0
  Rb  Rb5  1  0.250  0.756  0.958  1.0
  Rb  Rb6  1  0.750  0.744  0.458  1.0
  Rb  Rb7  1  0.250  0.256  0.542  1.0
  Ag  Ag8  1  0.750  0.363  0.364  1.0
  Ag  Ag9  1  0.250  0.637  0.636  1.0
  Ag  Ag10  1  0.750  0.863  0.136  1.0
  Ag  Ag11  1  0.250  0.137  0.864  1.0
  I  I12  1  0.750  0.314  0.223  1.0
  I  I13  1  0.250  0.686  0.777  1.0
  I  I14  1  0.750  0.814  0.277  1.0
  I  I15  1  0.250  0.186  0.723  1.0
  I  I16  1  0.750  0.120  0.429  1.0
  I  I17  1  0.250  0.880  0.571  1.0
  I  I18  1  0.750  0.620  0.071  1.0
  I  I19  1  0.250  0.380  0.929  1.0
  I  I20  1  0.750  0.005  0.897  1.0
  I  I21  1  0.250  0.995  0.103  1.0
  I  I22  1  0.750  0.505  0.603  1.0
  I  I23  1  0.250  0.495  0.397  1.0
[/CIF]
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