The material described by KEuAsS4 crystallizes in the monoclinic P2_1/m space group. K(1) is bonded in a 8-coordinate geometry to one S(1), three equivalent S(3), and four equivalent S(2) atoms. Eu(1) is bonded in a 8-coordinate geometry to one S(3), three equivalent S(1), and four equivalent S(2) atoms. As(1) is bonded in a tetrahedral geometry to one S(1), one S(3), and two equivalent S(2) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one K(1), three equivalent Eu(1), and one As(1) atom. In the second S site, S(2) is bonded to two equivalent K(1), two equivalent Eu(1), and one As(1) atom to form distorted SK2Eu2As square pyramids that share corners with four equivalent S(2)K2Eu2As square pyramids, corners with five equivalent S(3)K3EuAs trigonal bipyramids, edges with three equivalent S(2)K2Eu2As square pyramids, edges with two equivalent S(3)K3EuAs trigonal bipyramids, and  a faceface with one S(2)K2Eu2As square pyramid. In the third S site, S(3) is bonded to three equivalent K(1), one Eu(1), and one As(1) atom to form distorted SK3EuAs trigonal bipyramids that share corners with ten equivalent S(2)K2Eu2As square pyramids, corners with two equivalent S(3)K3EuAs trigonal bipyramids, edges with four equivalent S(2)K2Eu2As square pyramids, and edges with two equivalent S(3)K3EuAs trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_KEuAsS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.824
_cell_length_b   6.833
_cell_length_c   8.904
_cell_angle_alpha   73.146
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   397.368
_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
  K  K0  1  0.250  0.268  0.934  1.0
  K  K1  1  0.750  0.732  0.066  1.0
  Eu  Eu2  1  0.750  0.769  0.551  1.0
  Eu  Eu3  1  0.250  0.231  0.449  1.0
  As  As4  1  0.750  0.211  0.688  1.0
  As  As5  1  0.250  0.789  0.312  1.0
  S  S6  1  0.250  0.608  0.560  1.0
  S  S7  1  0.497  0.003  0.729  1.0
  S  S8  1  0.003  0.003  0.729  1.0
  S  S9  1  0.750  0.412  0.839  1.0
  S  S10  1  0.250  0.588  0.161  1.0
  S  S11  1  0.997  0.997  0.271  1.0
  S  S12  1  0.503  0.997  0.271  1.0
  S  S13  1  0.750  0.392  0.440  1.0
[/CIF]
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The material described by KEuAsS4 crystallizes in the monoclinic P2_1/m space group. K(1) is bonded in a 8-coordinate geometry to one S(1), three equivalent S(3), and four equivalent S(2) atoms. Eu(1) is bonded in a 8-coordinate geometry to one S(3), three equivalent S(1), and four equivalent S(2) atoms. As(1) is bonded in a tetrahedral geometry to one S(1), one S(3), and two equivalent S(2) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one K(1), three equivalent Eu(1), and one As(1) atom. In the second S site, S(2) is bonded to two equivalent K(1), two equivalent Eu(1), and one As(1) atom to form distorted SK2Eu2As square pyramids that share corners with four equivalent S(2)K2Eu2As square pyramids, corners with five equivalent S(3)K3EuAs trigonal bipyramids, edges with three equivalent S(2)K2Eu2As square pyramids, edges with two equivalent S(3)K3EuAs trigonal bipyramids, and  a faceface with one S(2)K2Eu2As square pyramid. In the third S site, S(3) is bonded to three equivalent K(1), one Eu(1), and one As(1) atom to form distorted SK3EuAs trigonal bipyramids that share corners with ten equivalent S(2)K2Eu2As square pyramids, corners with two equivalent S(3)K3EuAs trigonal bipyramids, edges with four equivalent S(2)K2Eu2As square pyramids, and edges with two equivalent S(3)K3EuAs trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_KEuAsS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.824
_cell_length_b   6.833
_cell_length_c   8.904
_cell_angle_alpha   73.146
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   397.368
_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
  K  K0  1  0.250  0.268  0.934  1.0
  K  K1  1  0.750  0.732  0.066  1.0
  Eu  Eu2  1  0.750  0.769  0.551  1.0
  Eu  Eu3  1  0.250  0.231  0.449  1.0
  As  As4  1  0.750  0.211  0.688  1.0
  As  As5  1  0.250  0.789  0.312  1.0
  S  S6  1  0.250  0.608  0.560  1.0
  S  S7  1  0.497  0.003  0.729  1.0
  S  S8  1  0.003  0.003  0.729  1.0
  S  S9  1  0.750  0.412  0.839  1.0
  S  S10  1  0.250  0.588  0.161  1.0
  S  S11  1  0.997  0.997  0.271  1.0
  S  S12  1  0.503  0.997  0.271  1.0
  S  S13  1  0.750  0.392  0.440  1.0
[/CIF]
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