The crystal structure described by Rb4Al2S5 crystallizes in the orthorhombic Pna2_1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to one S(1), one S(3), two equivalent S(4), and two equivalent S(5) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one S(1), one S(3), two equivalent S(2), and two equivalent S(4) atoms. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to one S(2), one S(3), one S(4), one S(5), and two equivalent S(1) atoms. In the fourth Rb site, Rb(4) is bonded to one S(2), one S(3), one S(4), one S(5), and two equivalent S(1) atoms to form distorted RbS6 pentagonal pyramids that share corners with two equivalent Rb(4)S6 pentagonal pyramids, corners with two equivalent Al(2)S4 tetrahedra, corners with three equivalent Al(1)S4 tetrahedra,  an edgeedge with one Al(1)S4 tetrahedra, and  an edgeedge with one Al(2)S4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one S(1), one S(2), one S(3), and one S(5) atom to form AlS4 tetrahedra that share corners with three equivalent Rb(4)S6 pentagonal pyramids,  a cornercorner with one Al(2)S4 tetrahedra,  an edgeedge with one Rb(4)S6 pentagonal pyramid, and  an edgeedge with one Al(2)S4 tetrahedra. In the second Al site, Al(2) is bonded to one S(2), one S(3), one S(4), and one S(5) atom to form AlS4 tetrahedra that share corners with two equivalent Rb(4)S6 pentagonal pyramids,  a cornercorner with one Al(1)S4 tetrahedra,  an edgeedge with one Rb(4)S6 pentagonal pyramid, and  an edgeedge with one Al(1)S4 tetrahedra. There are five inequivalent S sites. In the first S site, S(3) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(4), one Al(1), and one Al(2) atom. In the second S site, S(4) is bonded in a 7-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), two equivalent Rb(2), and one Al(2) atom. In the third S site, S(5) is bonded in a 6-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), one Al(1), and one Al(2) atom. In the fourth S site, S(1) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), two equivalent Rb(4), and one Al(1) atom. In the fifth S site, S(2) is bonded in a 6-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(2), one Al(1), and one Al(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb4Al2S5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.720
_cell_length_b   11.649
_cell_length_c   11.688
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1323.463
_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  0.235  0.519  0.891  1.0
  Rb  Rb1  1  0.735  0.481  0.109  1.0
  Rb  Rb2  1  0.735  0.981  0.391  1.0
  Rb  Rb3  1  0.235  0.019  0.609  1.0
  Rb  Rb4  1  0.714  0.553  0.423  1.0
  Rb  Rb5  1  0.214  0.447  0.577  1.0
  Rb  Rb6  1  0.214  0.947  0.923  1.0
  Rb  Rb7  1  0.714  0.053  0.077  1.0
  Rb  Rb8  1  0.366  0.754  0.426  1.0
  Rb  Rb9  1  0.866  0.246  0.574  1.0
  Rb  Rb10  1  0.866  0.746  0.926  1.0
  Rb  Rb11  1  0.366  0.254  0.074  1.0
  Rb  Rb12  1  0.475  0.756  0.111  1.0
  Rb  Rb13  1  0.975  0.244  0.889  1.0
  Rb  Rb14  1  0.975  0.744  0.611  1.0
  Rb  Rb15  1  0.475  0.256  0.389  1.0
  Al  Al16  1  0.181  0.540  0.220  1.0
  Al  Al17  1  0.681  0.460  0.780  1.0
  Al  Al18  1  0.681  0.960  0.720  1.0
  Al  Al19  1  0.181  0.040  0.280  1.0
  Al  Al20  1  0.001  0.750  0.263  1.0
  Al  Al21  1  0.501  0.250  0.737  1.0
  Al  Al22  1  0.501  0.750  0.763  1.0
  Al  Al23  1  0.001  0.250  0.237  1.0
  S  S24  1  0.403  0.508  0.254  1.0
  S  S25  1  0.903  0.492  0.746  1.0
  S  S26  1  0.903  0.992  0.754  1.0
  S  S27  1  0.403  0.008  0.246  1.0
  S  S28  1  0.050  0.590  0.375  1.0
  S  S29  1  0.550  0.410  0.625  1.0
  S  S30  1  0.550  0.910  0.875  1.0
  S  S31  1  0.050  0.090  0.125  1.0
  S  S32  1  0.142  0.707  0.112  1.0
  S  S33  1  0.642  0.293  0.888  1.0
  S  S34  1  0.642  0.793  0.612  1.0
  S  S35  1  0.142  0.207  0.388  1.0
  S  S36  1  0.280  0.737  0.714  1.0
  S  S37  1  0.780  0.263  0.286  1.0
  S  S38  1  0.780  0.763  0.214  1.0
  S  S39  1  0.280  0.237  0.786  1.0
  S  S40  1  0.072  0.898  0.380  1.0
  S  S41  1  0.572  0.102  0.620  1.0
  S  S42  1  0.572  0.602  0.880  1.0
  S  S43  1  0.072  0.398  0.120  1.0
[/CIF]
.
The crystal structure described by Rb4Al2S5 crystallizes in the orthorhombic Pna2_1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to one S(1), one S(3), two equivalent S(4), and two equivalent S(5) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one S(1), one S(3), two equivalent S(2), and two equivalent S(4) atoms. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to one S(2), one S(3), one S(4), one S(5), and two equivalent S(1) atoms. In the fourth Rb site, Rb(4) is bonded to one S(2), one S(3), one S(4), one S(5), and two equivalent S(1) atoms to form distorted RbS6 pentagonal pyramids that share corners with two equivalent Rb(4)S6 pentagonal pyramids, corners with two equivalent Al(2)S4 tetrahedra, corners with three equivalent Al(1)S4 tetrahedra,  an edgeedge with one Al(1)S4 tetrahedra, and  an edgeedge with one Al(2)S4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one S(1), one S(2), one S(3), and one S(5) atom to form AlS4 tetrahedra that share corners with three equivalent Rb(4)S6 pentagonal pyramids,  a cornercorner with one Al(2)S4 tetrahedra,  an edgeedge with one Rb(4)S6 pentagonal pyramid, and  an edgeedge with one Al(2)S4 tetrahedra. In the second Al site, Al(2) is bonded to one S(2), one S(3), one S(4), and one S(5) atom to form AlS4 tetrahedra that share corners with two equivalent Rb(4)S6 pentagonal pyramids,  a cornercorner with one Al(1)S4 tetrahedra,  an edgeedge with one Rb(4)S6 pentagonal pyramid, and  an edgeedge with one Al(1)S4 tetrahedra. There are five inequivalent S sites. In the first S site, S(3) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(4), one Al(1), and one Al(2) atom. In the second S site, S(4) is bonded in a 7-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), two equivalent Rb(2), and one Al(2) atom. In the third S site, S(5) is bonded in a 6-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), one Al(1), and one Al(2) atom. In the fourth S site, S(1) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), two equivalent Rb(4), and one Al(1) atom. In the fifth S site, S(2) is bonded in a 6-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(2), one Al(1), and one Al(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb4Al2S5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.720
_cell_length_b   11.649
_cell_length_c   11.688
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1323.463
_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  0.235  0.519  0.891  1.0
  Rb  Rb1  1  0.735  0.481  0.109  1.0
  Rb  Rb2  1  0.735  0.981  0.391  1.0
  Rb  Rb3  1  0.235  0.019  0.609  1.0
  Rb  Rb4  1  0.714  0.553  0.423  1.0
  Rb  Rb5  1  0.214  0.447  0.577  1.0
  Rb  Rb6  1  0.214  0.947  0.923  1.0
  Rb  Rb7  1  0.714  0.053  0.077  1.0
  Rb  Rb8  1  0.366  0.754  0.426  1.0
  Rb  Rb9  1  0.866  0.246  0.574  1.0
  Rb  Rb10  1  0.866  0.746  0.926  1.0
  Rb  Rb11  1  0.366  0.254  0.074  1.0
  Rb  Rb12  1  0.475  0.756  0.111  1.0
  Rb  Rb13  1  0.975  0.244  0.889  1.0
  Rb  Rb14  1  0.975  0.744  0.611  1.0
  Rb  Rb15  1  0.475  0.256  0.389  1.0
  Al  Al16  1  0.181  0.540  0.220  1.0
  Al  Al17  1  0.681  0.460  0.780  1.0
  Al  Al18  1  0.681  0.960  0.720  1.0
  Al  Al19  1  0.181  0.040  0.280  1.0
  Al  Al20  1  0.001  0.750  0.263  1.0
  Al  Al21  1  0.501  0.250  0.737  1.0
  Al  Al22  1  0.501  0.750  0.763  1.0
  Al  Al23  1  0.001  0.250  0.237  1.0
  S  S24  1  0.403  0.508  0.254  1.0
  S  S25  1  0.903  0.492  0.746  1.0
  S  S26  1  0.903  0.992  0.754  1.0
  S  S27  1  0.403  0.008  0.246  1.0
  S  S28  1  0.050  0.590  0.375  1.0
  S  S29  1  0.550  0.410  0.625  1.0
  S  S30  1  0.550  0.910  0.875  1.0
  S  S31  1  0.050  0.090  0.125  1.0
  S  S32  1  0.142  0.707  0.112  1.0
  S  S33  1  0.642  0.293  0.888  1.0
  S  S34  1  0.642  0.793  0.612  1.0
  S  S35  1  0.142  0.207  0.388  1.0
  S  S36  1  0.280  0.737  0.714  1.0
  S  S37  1  0.780  0.263  0.286  1.0
  S  S38  1  0.780  0.763  0.214  1.0
  S  S39  1  0.280  0.237  0.786  1.0
  S  S40  1  0.072  0.898  0.380  1.0
  S  S41  1  0.572  0.102  0.620  1.0
  S  S42  1  0.572  0.602  0.880  1.0
  S  S43  1  0.072  0.398  0.120  1.0
[/CIF]
.