The compound described by Rb4Sb2O5 is Krennerite-derived structured and crystallizes in the orthorhombic Pnma space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one Sb(1), one Sb(2), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted trigonal non-coplanar geometry to one Rb(1), one O(3), and two equivalent O(2) atoms. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one Rb(1), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Rb(1), one Rb(3), one Rb(4), two equivalent Rb(2), and one Sb(2) atom to form a mixture of distorted edge, face, and corner-sharing ORb5Sb octahedra. The corner-sharing octahedral tilt angles range from 42-68°. In the second O site, O(2) is bonded to one Rb(1), one Rb(2), one Rb(4), two equivalent Rb(3), and one Sb(1) atom to form a mixture of distorted edge, face, and corner-sharing ORb5Sb octahedra. The corner-sharing octahedral tilt angles range from 42-68°. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Rb(4), two equivalent Rb(1), one Sb(1), and one Sb(2) atom. is represented by the CIF file [CIF]
data_Rb4Sb2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.583
_cell_length_b   8.170
_cell_length_c   19.086
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1026.457
_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  0.250  0.625  0.844  1.0
  Rb  Rb1  1  0.250  0.626  0.512  1.0
  Rb  Rb2  1  0.750  0.624  0.988  1.0
  Rb  Rb3  1  0.750  0.625  0.656  1.0
  Rb  Rb4  1  0.250  0.874  0.012  1.0
  Rb  Rb5  1  0.250  0.875  0.344  1.0
  Rb  Rb6  1  0.750  0.875  0.156  1.0
  Rb  Rb7  1  0.750  0.876  0.488  1.0
  Rb  Rb8  1  0.750  0.125  0.656  1.0
  Rb  Rb9  1  0.250  0.125  0.844  1.0
  Rb  Rb10  1  0.750  0.126  0.988  1.0
  Rb  Rb11  1  0.250  0.124  0.512  1.0
  Rb  Rb12  1  0.250  0.375  0.344  1.0
  Rb  Rb13  1  0.750  0.374  0.488  1.0
  Rb  Rb14  1  0.250  0.376  0.012  1.0
  Rb  Rb15  1  0.750  0.375  0.156  1.0
  Sb  Sb16  1  0.250  0.616  0.165  1.0
  Sb  Sb17  1  0.750  0.634  0.335  1.0
  Sb  Sb18  1  0.750  0.866  0.835  1.0
  Sb  Sb19  1  0.250  0.884  0.665  1.0
  Sb  Sb20  1  0.750  0.116  0.335  1.0
  Sb  Sb21  1  0.250  0.134  0.165  1.0
  Sb  Sb22  1  0.250  0.366  0.665  1.0
  Sb  Sb23  1  0.750  0.384  0.835  1.0
  O  O24  1  0.529  0.627  0.400  1.0
  O  O25  1  0.029  0.624  0.100  1.0
  O  O26  1  0.750  0.625  0.811  1.0
  O  O27  1  0.471  0.624  0.100  1.0
  O  O28  1  0.971  0.627  0.400  1.0
  O  O29  1  0.529  0.873  0.900  1.0
  O  O30  1  0.750  0.875  0.311  1.0
  O  O31  1  0.471  0.876  0.600  1.0
  O  O32  1  0.029  0.876  0.600  1.0
  O  O33  1  0.971  0.873  0.900  1.0
  O  O34  1  0.029  0.127  0.100  1.0
  O  O35  1  0.471  0.127  0.100  1.0
  O  O36  1  0.971  0.124  0.400  1.0
  O  O37  1  0.529  0.124  0.400  1.0
  O  O38  1  0.250  0.125  0.689  1.0
  O  O39  1  0.029  0.373  0.600  1.0
  O  O40  1  0.471  0.373  0.600  1.0
  O  O41  1  0.529  0.376  0.900  1.0
  O  O42  1  0.971  0.376  0.900  1.0
  O  O43  1  0.250  0.375  0.189  1.0
[/CIF]
.
The compound described by Rb4Sb2O5 is Krennerite-derived structured and crystallizes in the orthorhombic Pnma space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one Sb(1), one Sb(2), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted trigonal non-coplanar geometry to one Rb(1), one O(3), and two equivalent O(2) atoms. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one Rb(1), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Rb(1), one Rb(3), one Rb(4), two equivalent Rb(2), and one Sb(2) atom to form a mixture of distorted edge, face, and corner-sharing ORb5Sb octahedra. The corner-sharing octahedral tilt angles range from 42-68°. In the second O site, O(2) is bonded to one Rb(1), one Rb(2), one Rb(4), two equivalent Rb(3), and one Sb(1) atom to form a mixture of distorted edge, face, and corner-sharing ORb5Sb octahedra. The corner-sharing octahedral tilt angles range from 42-68°. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Rb(4), two equivalent Rb(1), one Sb(1), and one Sb(2) atom. is represented by the CIF file [CIF]
data_Rb4Sb2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.583
_cell_length_b   8.170
_cell_length_c   19.086
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1026.457
_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  0.250  0.625  0.844  1.0
  Rb  Rb1  1  0.250  0.626  0.512  1.0
  Rb  Rb2  1  0.750  0.624  0.988  1.0
  Rb  Rb3  1  0.750  0.625  0.656  1.0
  Rb  Rb4  1  0.250  0.874  0.012  1.0
  Rb  Rb5  1  0.250  0.875  0.344  1.0
  Rb  Rb6  1  0.750  0.875  0.156  1.0
  Rb  Rb7  1  0.750  0.876  0.488  1.0
  Rb  Rb8  1  0.750  0.125  0.656  1.0
  Rb  Rb9  1  0.250  0.125  0.844  1.0
  Rb  Rb10  1  0.750  0.126  0.988  1.0
  Rb  Rb11  1  0.250  0.124  0.512  1.0
  Rb  Rb12  1  0.250  0.375  0.344  1.0
  Rb  Rb13  1  0.750  0.374  0.488  1.0
  Rb  Rb14  1  0.250  0.376  0.012  1.0
  Rb  Rb15  1  0.750  0.375  0.156  1.0
  Sb  Sb16  1  0.250  0.616  0.165  1.0
  Sb  Sb17  1  0.750  0.634  0.335  1.0
  Sb  Sb18  1  0.750  0.866  0.835  1.0
  Sb  Sb19  1  0.250  0.884  0.665  1.0
  Sb  Sb20  1  0.750  0.116  0.335  1.0
  Sb  Sb21  1  0.250  0.134  0.165  1.0
  Sb  Sb22  1  0.250  0.366  0.665  1.0
  Sb  Sb23  1  0.750  0.384  0.835  1.0
  O  O24  1  0.529  0.627  0.400  1.0
  O  O25  1  0.029  0.624  0.100  1.0
  O  O26  1  0.750  0.625  0.811  1.0
  O  O27  1  0.471  0.624  0.100  1.0
  O  O28  1  0.971  0.627  0.400  1.0
  O  O29  1  0.529  0.873  0.900  1.0
  O  O30  1  0.750  0.875  0.311  1.0
  O  O31  1  0.471  0.876  0.600  1.0
  O  O32  1  0.029  0.876  0.600  1.0
  O  O33  1  0.971  0.873  0.900  1.0
  O  O34  1  0.029  0.127  0.100  1.0
  O  O35  1  0.471  0.127  0.100  1.0
  O  O36  1  0.971  0.124  0.400  1.0
  O  O37  1  0.529  0.124  0.400  1.0
  O  O38  1  0.250  0.125  0.689  1.0
  O  O39  1  0.029  0.373  0.600  1.0
  O  O40  1  0.471  0.373  0.600  1.0
  O  O41  1  0.529  0.376  0.900  1.0
  O  O42  1  0.971  0.376  0.900  1.0
  O  O43  1  0.250  0.375  0.189  1.0
[/CIF]
.