The crystal structure described by K3Cr11S18 is Orthorhombic Perovskite-like structured and crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1,2) is bonded in a 8-coordinate geometry to one S(3), one S(4), two equivalent S(2), two equivalent S(7), and two equivalent S(9) atoms. In the second K site, K(3) is bonded in a 12-coordinate geometry to two equivalent K(3), one S(12), one S(6), two equivalent S(10), two equivalent S(11), two equivalent S(13), and two equivalent S(8) atoms. There are eleven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one S(13), one S(3), two equivalent S(12), and two equivalent S(16) atoms to form a mixture of corner and edge-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-49°. In the second Cr site, Cr(2) is bonded to one S(10), one S(9), two equivalent S(4), and two equivalent S(6) atoms to form a mixture of corner and edge-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-49°. In the third Cr site, Cr(3) is bonded to one S(16); two equivalent S(13); and three equivalent S(5,18) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the fourth Cr site, Cr(4) is bonded to one S(14), one S(6), two equivalent S(17), and two equivalent S(9) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the fifth Cr site, Cr(5) is bonded to one S(6), one S(7), two equivalent S(17), and two equivalent S(8) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the sixth Cr site, Cr(6) is bonded to one S(1), one S(12), two equivalent S(11), and two equivalent S(15) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the seventh Cr site, Cr(7) is bonded to one S(4); two equivalent S(10); and three equivalent S(5,18) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the eighth Cr site, Cr(8) is bonded to one S(12), one S(2), two equivalent S(15), and two equivalent S(3) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the ninth Cr site, Cr(9) is bonded to one S(4); one S(8); two equivalent S(5,18); and two equivalent S(7) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the tenth Cr site, Cr(10) is bonded to one S(11); one S(16); two equivalent S(1); and two equivalent S(5,18) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the eleventh Cr site, Cr(11) is bonded to one S(15), one S(17), two equivalent S(14), and two equivalent S(2) atoms to form a mixture of corner and edge-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. There are seventeen inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to two equivalent K(1,2); one Cr(6); and two equivalent Cr(10) atoms. In the second S site, S(2) is bonded to two equivalent K(1,2); one Cr(8); and two equivalent Cr(11) atoms to form distorted SK2Cr3 square pyramids that share corners with two equivalent S(9)K3Cr3 octahedra, corners with two equivalent S(14)K2Cr3 square pyramids, corners with two equivalent S(17)Cr5 trigonal bipyramids, corners with two equivalent S(4)KCr4 trigonal bipyramids,  a cornercorner with one S(12)KCr4 trigonal pyramid,  an edgeedge with one S(9)K3Cr3 octahedra, edges with two equivalent S(3)K3Cr3 octahedra,  an edgeedge with one S(14)K2Cr3 square pyramid, edges with two equivalent S(2)K2Cr3 square pyramids, and edges with two equivalent S(15)Cr5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 15°. In the third S site, S(3) is bonded to three equivalent K(1,2); one Cr(1); and two equivalent Cr(8) atoms to form distorted SK3Cr3 octahedra that share corners with two equivalent S(14)K2Cr3 square pyramids,  a cornercorner with one S(4)KCr4 trigonal bipyramid, corners with two equivalent S(15)Cr5 trigonal bipyramids, edges with two equivalent S(3)K3Cr3 octahedra, edges with two equivalent S(9)K3Cr3 octahedra,  an edgeedge with one S(14)K2Cr3 square pyramid, edges with two equivalent S(2)K2Cr3 square pyramids,  an edgeedge with one S(15)Cr5 trigonal bipyramid, edges with two equivalent S(16)KCr4 trigonal bipyramids, and edges with two equivalent S(12)KCr4 trigonal pyramids. In the fourth S site, S(4) is bonded to one K(1,2); one Cr(7); one Cr(9); and two equivalent Cr(2) atoms to form distorted SKCr4 trigonal bipyramids that share  a cornercorner with one S(3)K3Cr3 octahedra; corners with two equivalent S(2)K2Cr3 square pyramids;  a cornercorner with one S(5,18)Cr5 trigonal bipyramid; corners with two equivalent S(4)KCr4 trigonal bipyramids; corners with two equivalent S(6)KCr4 trigonal pyramids; edges with two equivalent S(9)K3Cr3 octahedra; edges with two equivalent S(5,18)Cr5 trigonal bipyramids; and  an edgeedge with one S(6)KCr4 trigonal pyramid. The corner-sharing octahedral tilt angles are 19°. In the fifth S site, S(5,18) is bonded to one Cr(3), two equivalent Cr(7), and two equivalent Cr(9) atoms to form distorted SCr5 trigonal bipyramids that share  a cornercorner with one S(16)KCr4 trigonal bipyramid; edges with two equivalent S(4)KCr4 trigonal bipyramids; and edges with four equivalent S(5,18)Cr5 trigonal bipyramids. In the sixth S site, S(6) is bonded to one K(3), one Cr(4), one Cr(5), and two equivalent Cr(2) atoms to form distorted SKCr4 trigonal pyramids that share  a cornercorner with one S(14)K2Cr3 square pyramid, corners with two equivalent S(4)KCr4 trigonal bipyramids,  a cornercorner with one S(12)KCr4 trigonal pyramid, corners with two equivalent S(6)KCr4 trigonal pyramids, edges with two equivalent S(9)K3Cr3 octahedra,  an edgeedge with one S(4)KCr4 trigonal bipyramid, and edges with two equivalent S(17)Cr5 trigonal bipyramids. In the seventh S site, S(7) is bonded in a 5-coordinate geometry to two equivalent K(1,2); one Cr(5); and two equivalent Cr(9) atoms. In the eighth S site, S(8) is bonded in a 5-coordinate geometry to two equivalent K(3), one Cr(9), and two equivalent Cr(5) atoms. In the ninth S site, S(9) is bonded to three equivalent K(1,2); one Cr(2); and two equivalent Cr(4) atoms to form distorted SK3Cr3 octahedra that share corners with two equivalent S(2)K2Cr3 square pyramids,  a cornercorner with one S(16)KCr4 trigonal bipyramid, corners with two equivalent S(17)Cr5 trigonal bipyramids, edges with two equivalent S(3)K3Cr3 octahedra, edges with two equivalent S(9)K3Cr3 octahedra,  an edgeedge with one S(2)K2Cr3 square pyramid, edges with two equivalent S(14)K2Cr3 square pyramids,  an edgeedge with one S(17)Cr5 trigonal bipyramid, edges with two equivalent S(4)KCr4 trigonal bipyramids, and edges with two equivalent S(6)KCr4 trigonal pyramids. In the tenth S site, S(10) is bonded in a 5-coordinate geometry to two equivalent K(3), one Cr(2), and two equivalent Cr(7) atoms. In the eleventh S site, S(11) is bonded in a 5-coordinate geometry to two equivalent K(3), one Cr(10), and two equivalent Cr(6) atoms. In the twelfth S site, S(12) is bonded to one K(3), one Cr(6), one Cr(8), and two equivalent Cr(1) atoms to form distorted SKCr4 trigonal pyramids that share  a cornercorner with one S(2)K2Cr3 square pyramid, corners with two equivalent S(16)KCr4 trigonal bipyramids,  a cornercorner with one S(6)KCr4 trigonal pyramid, corners with two equivalent S(12)KCr4 trigonal pyramids, edges with two equivalent S(3)K3Cr3 octahedra,  an edgeedge with one S(16)KCr4 trigonal bipyramid, and edges with two equivalent S(15)Cr5 trigonal bipyramids. In the thirteenth S site, S(13) is bonded in a 5-coordinate geometry to two equivalent K(3), one Cr(1), and two equivalent Cr(3) atoms. In the fourteenth S site, S(14) is bonded to two equivalent K(1,2); one Cr(4); and two equivalent Cr(11) atoms to form distorted SK2Cr3 square pyramids that share corners with two equivalent S(3)K3Cr3 octahedra, corners with two equivalent S(2)K2Cr3 square pyramids, corners with two equivalent S(15)Cr5 trigonal bipyramids, corners with two equivalent S(16)KCr4 trigonal bipyramids,  a cornercorner with one S(6)KCr4 trigonal pyramid,  an edgeedge with one S(3)K3Cr3 octahedra, edges with two equivalent S(9)K3Cr3 octahedra,  an edgeedge with one S(2)K2Cr3 square pyramid, edges with two equivalent S(14)K2Cr3 square pyramids, and edges with two equivalent S(17)Cr5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 15°. In the fifteenth S site, S(15) is bonded to one Cr(11), two equivalent Cr(6), and two equivalent Cr(8) atoms to form distorted SCr5 trigonal bipyramids that share corners with two equivalent S(3)K3Cr3 octahedra, corners with two equivalent S(14)K2Cr3 square pyramids,  a cornercorner with one S(17)Cr5 trigonal bipyramid,  an edgeedge with one S(3)K3Cr3 octahedra, edges with two equivalent S(2)K2Cr3 square pyramids, edges with two equivalent S(15)Cr5 trigonal bipyramids, and edges with two equivalent S(12)KCr4 trigonal pyramids. The corner-sharing octahedral tilt angles are 6°. In the sixteenth S site, S(16) is bonded to one K(1,2); one Cr(10); one Cr(3); and two equivalent Cr(1) atoms to form distorted SKCr4 trigonal bipyramids that share  a cornercorner with one S(9)K3Cr3 octahedra; corners with two equivalent S(14)K2Cr3 square pyramids;  a cornercorner with one S(5,18)Cr5 trigonal bipyramid; corners with two equivalent S(16)KCr4 trigonal bipyramids; corners with two equivalent S(12)KCr4 trigonal pyramids; edges with two equivalent S(3)K3Cr3 octahedra; edges with two equivalent S(5,18)Cr5 trigonal bipyramids; and  an edgeedge with one S(12)KCr4 trigonal pyramid. The corner-sharing octahedral tilt angles are 19°. In the seventeenth S site, S(17) is bonded to one Cr(11), two equivalent Cr(4), and two equivalent Cr(5) atoms to form distorted SCr5 trigonal bipyramids that share corners with two equivalent S(9)K3Cr3 octahedra, corners with two equivalent S(2)K2Cr3 square pyramids,  a cornercorner with one S(15)Cr5 trigonal bipyramid,  an edgeedge with one S(9)K3Cr3 octahedra, edges with two equivalent S(14)K2Cr3 square pyramids, edges with two equivalent S(17)Cr5 trigonal bipyramids, and edges with two equivalent S(6)KCr4 trigonal pyramids. The corner-sharing octahedral tilt angles are 6°. is represented by the CIF card [CIF]
data_K3Cr11S18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.880
_cell_length_b   10.880
_cell_length_c   16.472
_cell_angle_alpha   80.173
_cell_angle_beta   80.173
_cell_angle_gamma   18.620
_symmetry_Int_Tables_number   1
_cell_volume   613.132
_cell_formula_units_Z   1
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
  K  K0  1  0.194  0.194  0.911  1.0
  K  K1  1  0.806  0.806  0.089  1.0
  K  K2  1  0.497  0.497  0.500  1.0
  Cr  Cr3  1  0.151  0.151  0.278  1.0
  Cr  Cr4  1  0.849  0.849  0.722  1.0
  Cr  Cr5  1  0.705  0.705  0.430  1.0
  Cr  Cr6  1  0.409  0.409  0.868  1.0
  Cr  Cr7  1  0.530  0.530  0.743  1.0
  Cr  Cr8  1  0.470  0.470  0.257  1.0
  Cr  Cr9  1  0.295  0.295  0.570  1.0
  Cr  Cr10  1  0.591  0.591  0.132  1.0
  Cr  Cr11  1  0.165  0.165  0.680  1.0
  Cr  Cr12  1  0.835  0.835  0.320  1.0
  Cr  Cr13  1  0.000  0.000  0.000  1.0
  S  S14  1  0.364  0.364  0.227  1.0
  S  S15  1  0.577  0.577  0.992  1.0
  S  S16  1  0.165  0.165  0.126  1.0
  S  S17  1  0.270  0.270  0.719  1.0
  S  S18  1  0.706  0.706  0.576  1.0
  S  S19  1  0.422  0.422  0.719  1.0
  S  S20  1  0.636  0.636  0.773  1.0
  S  S21  1  0.061  0.061  0.648  1.0
  S  S22  1  0.835  0.835  0.874  1.0
  S  S23  1  0.864  0.864  0.574  1.0
  S  S24  1  0.939  0.939  0.352  1.0
  S  S25  1  0.578  0.578  0.281  1.0
  S  S26  1  0.136  0.136  0.426  1.0
  S  S27  1  0.423  0.423  0.008  1.0
  S  S28  1  0.003  0.003  0.148  1.0
  S  S29  1  0.730  0.730  0.281  1.0
  S  S30  1  0.997  0.997  0.852  1.0
  S  S31  1  0.294  0.294  0.424  1.0
[/CIF]
.
The crystal structure described by K3Cr11S18 is Orthorhombic Perovskite-like structured and crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1,2) is bonded in a 8-coordinate geometry to one S(3), one S(4), two equivalent S(2), two equivalent S(7), and two equivalent S(9) atoms. In the second K site, K(3) is bonded in a 12-coordinate geometry to two equivalent K(3), one S(12), one S(6), two equivalent S(10), two equivalent S(11), two equivalent S(13), and two equivalent S(8) atoms. There are eleven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one S(13), one S(3), two equivalent S(12), and two equivalent S(16) atoms to form a mixture of corner and edge-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-49°. In the second Cr site, Cr(2) is bonded to one S(10), one S(9), two equivalent S(4), and two equivalent S(6) atoms to form a mixture of corner and edge-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-49°. In the third Cr site, Cr(3) is bonded to one S(16); two equivalent S(13); and three equivalent S(5,18) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the fourth Cr site, Cr(4) is bonded to one S(14), one S(6), two equivalent S(17), and two equivalent S(9) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the fifth Cr site, Cr(5) is bonded to one S(6), one S(7), two equivalent S(17), and two equivalent S(8) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the sixth Cr site, Cr(6) is bonded to one S(1), one S(12), two equivalent S(11), and two equivalent S(15) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the seventh Cr site, Cr(7) is bonded to one S(4); two equivalent S(10); and three equivalent S(5,18) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the eighth Cr site, Cr(8) is bonded to one S(12), one S(2), two equivalent S(15), and two equivalent S(3) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the ninth Cr site, Cr(9) is bonded to one S(4); one S(8); two equivalent S(5,18); and two equivalent S(7) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the tenth Cr site, Cr(10) is bonded to one S(11); one S(16); two equivalent S(1); and two equivalent S(5,18) atoms to form a mixture of corner, edge, and face-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the eleventh Cr site, Cr(11) is bonded to one S(15), one S(17), two equivalent S(14), and two equivalent S(2) atoms to form a mixture of corner and edge-sharing CrS6 octahedra. The corner-sharing octahedral tilt angles are 49°. There are seventeen inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to two equivalent K(1,2); one Cr(6); and two equivalent Cr(10) atoms. In the second S site, S(2) is bonded to two equivalent K(1,2); one Cr(8); and two equivalent Cr(11) atoms to form distorted SK2Cr3 square pyramids that share corners with two equivalent S(9)K3Cr3 octahedra, corners with two equivalent S(14)K2Cr3 square pyramids, corners with two equivalent S(17)Cr5 trigonal bipyramids, corners with two equivalent S(4)KCr4 trigonal bipyramids,  a cornercorner with one S(12)KCr4 trigonal pyramid,  an edgeedge with one S(9)K3Cr3 octahedra, edges with two equivalent S(3)K3Cr3 octahedra,  an edgeedge with one S(14)K2Cr3 square pyramid, edges with two equivalent S(2)K2Cr3 square pyramids, and edges with two equivalent S(15)Cr5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 15°. In the third S site, S(3) is bonded to three equivalent K(1,2); one Cr(1); and two equivalent Cr(8) atoms to form distorted SK3Cr3 octahedra that share corners with two equivalent S(14)K2Cr3 square pyramids,  a cornercorner with one S(4)KCr4 trigonal bipyramid, corners with two equivalent S(15)Cr5 trigonal bipyramids, edges with two equivalent S(3)K3Cr3 octahedra, edges with two equivalent S(9)K3Cr3 octahedra,  an edgeedge with one S(14)K2Cr3 square pyramid, edges with two equivalent S(2)K2Cr3 square pyramids,  an edgeedge with one S(15)Cr5 trigonal bipyramid, edges with two equivalent S(16)KCr4 trigonal bipyramids, and edges with two equivalent S(12)KCr4 trigonal pyramids. In the fourth S site, S(4) is bonded to one K(1,2); one Cr(7); one Cr(9); and two equivalent Cr(2) atoms to form distorted SKCr4 trigonal bipyramids that share  a cornercorner with one S(3)K3Cr3 octahedra; corners with two equivalent S(2)K2Cr3 square pyramids;  a cornercorner with one S(5,18)Cr5 trigonal bipyramid; corners with two equivalent S(4)KCr4 trigonal bipyramids; corners with two equivalent S(6)KCr4 trigonal pyramids; edges with two equivalent S(9)K3Cr3 octahedra; edges with two equivalent S(5,18)Cr5 trigonal bipyramids; and  an edgeedge with one S(6)KCr4 trigonal pyramid. The corner-sharing octahedral tilt angles are 19°. In the fifth S site, S(5,18) is bonded to one Cr(3), two equivalent Cr(7), and two equivalent Cr(9) atoms to form distorted SCr5 trigonal bipyramids that share  a cornercorner with one S(16)KCr4 trigonal bipyramid; edges with two equivalent S(4)KCr4 trigonal bipyramids; and edges with four equivalent S(5,18)Cr5 trigonal bipyramids. In the sixth S site, S(6) is bonded to one K(3), one Cr(4), one Cr(5), and two equivalent Cr(2) atoms to form distorted SKCr4 trigonal pyramids that share  a cornercorner with one S(14)K2Cr3 square pyramid, corners with two equivalent S(4)KCr4 trigonal bipyramids,  a cornercorner with one S(12)KCr4 trigonal pyramid, corners with two equivalent S(6)KCr4 trigonal pyramids, edges with two equivalent S(9)K3Cr3 octahedra,  an edgeedge with one S(4)KCr4 trigonal bipyramid, and edges with two equivalent S(17)Cr5 trigonal bipyramids. In the seventh S site, S(7) is bonded in a 5-coordinate geometry to two equivalent K(1,2); one Cr(5); and two equivalent Cr(9) atoms. In the eighth S site, S(8) is bonded in a 5-coordinate geometry to two equivalent K(3), one Cr(9), and two equivalent Cr(5) atoms. In the ninth S site, S(9) is bonded to three equivalent K(1,2); one Cr(2); and two equivalent Cr(4) atoms to form distorted SK3Cr3 octahedra that share corners with two equivalent S(2)K2Cr3 square pyramids,  a cornercorner with one S(16)KCr4 trigonal bipyramid, corners with two equivalent S(17)Cr5 trigonal bipyramids, edges with two equivalent S(3)K3Cr3 octahedra, edges with two equivalent S(9)K3Cr3 octahedra,  an edgeedge with one S(2)K2Cr3 square pyramid, edges with two equivalent S(14)K2Cr3 square pyramids,  an edgeedge with one S(17)Cr5 trigonal bipyramid, edges with two equivalent S(4)KCr4 trigonal bipyramids, and edges with two equivalent S(6)KCr4 trigonal pyramids. In the tenth S site, S(10) is bonded in a 5-coordinate geometry to two equivalent K(3), one Cr(2), and two equivalent Cr(7) atoms. In the eleventh S site, S(11) is bonded in a 5-coordinate geometry to two equivalent K(3), one Cr(10), and two equivalent Cr(6) atoms. In the twelfth S site, S(12) is bonded to one K(3), one Cr(6), one Cr(8), and two equivalent Cr(1) atoms to form distorted SKCr4 trigonal pyramids that share  a cornercorner with one S(2)K2Cr3 square pyramid, corners with two equivalent S(16)KCr4 trigonal bipyramids,  a cornercorner with one S(6)KCr4 trigonal pyramid, corners with two equivalent S(12)KCr4 trigonal pyramids, edges with two equivalent S(3)K3Cr3 octahedra,  an edgeedge with one S(16)KCr4 trigonal bipyramid, and edges with two equivalent S(15)Cr5 trigonal bipyramids. In the thirteenth S site, S(13) is bonded in a 5-coordinate geometry to two equivalent K(3), one Cr(1), and two equivalent Cr(3) atoms. In the fourteenth S site, S(14) is bonded to two equivalent K(1,2); one Cr(4); and two equivalent Cr(11) atoms to form distorted SK2Cr3 square pyramids that share corners with two equivalent S(3)K3Cr3 octahedra, corners with two equivalent S(2)K2Cr3 square pyramids, corners with two equivalent S(15)Cr5 trigonal bipyramids, corners with two equivalent S(16)KCr4 trigonal bipyramids,  a cornercorner with one S(6)KCr4 trigonal pyramid,  an edgeedge with one S(3)K3Cr3 octahedra, edges with two equivalent S(9)K3Cr3 octahedra,  an edgeedge with one S(2)K2Cr3 square pyramid, edges with two equivalent S(14)K2Cr3 square pyramids, and edges with two equivalent S(17)Cr5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 15°. In the fifteenth S site, S(15) is bonded to one Cr(11), two equivalent Cr(6), and two equivalent Cr(8) atoms to form distorted SCr5 trigonal bipyramids that share corners with two equivalent S(3)K3Cr3 octahedra, corners with two equivalent S(14)K2Cr3 square pyramids,  a cornercorner with one S(17)Cr5 trigonal bipyramid,  an edgeedge with one S(3)K3Cr3 octahedra, edges with two equivalent S(2)K2Cr3 square pyramids, edges with two equivalent S(15)Cr5 trigonal bipyramids, and edges with two equivalent S(12)KCr4 trigonal pyramids. The corner-sharing octahedral tilt angles are 6°. In the sixteenth S site, S(16) is bonded to one K(1,2); one Cr(10); one Cr(3); and two equivalent Cr(1) atoms to form distorted SKCr4 trigonal bipyramids that share  a cornercorner with one S(9)K3Cr3 octahedra; corners with two equivalent S(14)K2Cr3 square pyramids;  a cornercorner with one S(5,18)Cr5 trigonal bipyramid; corners with two equivalent S(16)KCr4 trigonal bipyramids; corners with two equivalent S(12)KCr4 trigonal pyramids; edges with two equivalent S(3)K3Cr3 octahedra; edges with two equivalent S(5,18)Cr5 trigonal bipyramids; and  an edgeedge with one S(12)KCr4 trigonal pyramid. The corner-sharing octahedral tilt angles are 19°. In the seventeenth S site, S(17) is bonded to one Cr(11), two equivalent Cr(4), and two equivalent Cr(5) atoms to form distorted SCr5 trigonal bipyramids that share corners with two equivalent S(9)K3Cr3 octahedra, corners with two equivalent S(2)K2Cr3 square pyramids,  a cornercorner with one S(15)Cr5 trigonal bipyramid,  an edgeedge with one S(9)K3Cr3 octahedra, edges with two equivalent S(14)K2Cr3 square pyramids, edges with two equivalent S(17)Cr5 trigonal bipyramids, and edges with two equivalent S(6)KCr4 trigonal pyramids. The corner-sharing octahedral tilt angles are 6°. is represented by the CIF card [CIF]
data_K3Cr11S18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.880
_cell_length_b   10.880
_cell_length_c   16.472
_cell_angle_alpha   80.173
_cell_angle_beta   80.173
_cell_angle_gamma   18.620
_symmetry_Int_Tables_number   1
_cell_volume   613.132
_cell_formula_units_Z   1
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
  K  K0  1  0.194  0.194  0.911  1.0
  K  K1  1  0.806  0.806  0.089  1.0
  K  K2  1  0.497  0.497  0.500  1.0
  Cr  Cr3  1  0.151  0.151  0.278  1.0
  Cr  Cr4  1  0.849  0.849  0.722  1.0
  Cr  Cr5  1  0.705  0.705  0.430  1.0
  Cr  Cr6  1  0.409  0.409  0.868  1.0
  Cr  Cr7  1  0.530  0.530  0.743  1.0
  Cr  Cr8  1  0.470  0.470  0.257  1.0
  Cr  Cr9  1  0.295  0.295  0.570  1.0
  Cr  Cr10  1  0.591  0.591  0.132  1.0
  Cr  Cr11  1  0.165  0.165  0.680  1.0
  Cr  Cr12  1  0.835  0.835  0.320  1.0
  Cr  Cr13  1  0.000  0.000  0.000  1.0
  S  S14  1  0.364  0.364  0.227  1.0
  S  S15  1  0.577  0.577  0.992  1.0
  S  S16  1  0.165  0.165  0.126  1.0
  S  S17  1  0.270  0.270  0.719  1.0
  S  S18  1  0.706  0.706  0.576  1.0
  S  S19  1  0.422  0.422  0.719  1.0
  S  S20  1  0.636  0.636  0.773  1.0
  S  S21  1  0.061  0.061  0.648  1.0
  S  S22  1  0.835  0.835  0.874  1.0
  S  S23  1  0.864  0.864  0.574  1.0
  S  S24  1  0.939  0.939  0.352  1.0
  S  S25  1  0.578  0.578  0.281  1.0
  S  S26  1  0.136  0.136  0.426  1.0
  S  S27  1  0.423  0.423  0.008  1.0
  S  S28  1  0.003  0.003  0.148  1.0
  S  S29  1  0.730  0.730  0.281  1.0
  S  S30  1  0.997  0.997  0.852  1.0
  S  S31  1  0.294  0.294  0.424  1.0
[/CIF]
.