The structure described by EuYb2S4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 6-coordinate geometry to one S(2), one S(3), two equivalent S(1), and three equivalent S(4) atoms. In the second Yb site, Yb(2) is bonded to one S(1), two equivalent S(3), and three equivalent S(2) atoms to form edge-sharing YbS6 octahedra. Eu(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms. There are four inequivalent S sites. In the first S site, S(1) is bonded to one Yb(2), two equivalent Yb(1), and two equivalent Eu(1) atoms to form distorted edge-sharing SYb3Eu2 square pyramids. In the second S site, S(2) is bonded in a 7-coordinate geometry to one Yb(1), three equivalent Yb(2), two equivalent Eu(1), and one S(4) atom. In the third S site, S(3) is bonded to one Yb(1), two equivalent Yb(2), and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing SYb3Eu2 trigonal bipyramids. In the fourth S site, S(4) is bonded in a 6-coordinate geometry to three equivalent Yb(1), two equivalent Eu(1), and one S(2) atom. is represented by the CIF card [CIF]
data_Yb2EuS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.319
_cell_length_b   11.022
_cell_length_c   14.782
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   703.688
_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
  Yb  Yb0  1  0.250  0.434  0.386  1.0
  Yb  Yb1  1  0.250  0.934  0.114  1.0
  Yb  Yb2  1  0.750  0.566  0.614  1.0
  Yb  Yb3  1  0.750  0.066  0.886  1.0
  Yb  Yb4  1  0.250  0.406  0.890  1.0
  Yb  Yb5  1  0.250  0.906  0.610  1.0
  Yb  Yb6  1  0.750  0.594  0.110  1.0
  Yb  Yb7  1  0.750  0.094  0.390  1.0
  Eu  Eu8  1  0.250  0.767  0.316  1.0
  Eu  Eu9  1  0.250  0.267  0.184  1.0
  Eu  Eu10  1  0.750  0.233  0.684  1.0
  Eu  Eu11  1  0.750  0.733  0.816  1.0
  S  S12  1  0.250  0.186  0.818  1.0
  S  S13  1  0.250  0.686  0.682  1.0
  S  S14  1  0.750  0.814  0.182  1.0
  S  S15  1  0.750  0.314  0.318  1.0
  S  S16  1  0.250  0.187  0.527  1.0
  S  S17  1  0.250  0.687  0.973  1.0
  S  S18  1  0.750  0.813  0.473  1.0
  S  S19  1  0.750  0.313  0.027  1.0
  S  S20  1  0.250  0.032  0.291  1.0
  S  S21  1  0.250  0.532  0.209  1.0
  S  S22  1  0.750  0.968  0.709  1.0
  S  S23  1  0.750  0.468  0.791  1.0
  S  S24  1  0.250  0.374  0.579  1.0
  S  S25  1  0.250  0.874  0.921  1.0
  S  S26  1  0.750  0.626  0.421  1.0
  S  S27  1  0.750  0.126  0.079  1.0
[/CIF]
.
The structure described by EuYb2S4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 6-coordinate geometry to one S(2), one S(3), two equivalent S(1), and three equivalent S(4) atoms. In the second Yb site, Yb(2) is bonded to one S(1), two equivalent S(3), and three equivalent S(2) atoms to form edge-sharing YbS6 octahedra. Eu(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms. There are four inequivalent S sites. In the first S site, S(1) is bonded to one Yb(2), two equivalent Yb(1), and two equivalent Eu(1) atoms to form distorted edge-sharing SYb3Eu2 square pyramids. In the second S site, S(2) is bonded in a 7-coordinate geometry to one Yb(1), three equivalent Yb(2), two equivalent Eu(1), and one S(4) atom. In the third S site, S(3) is bonded to one Yb(1), two equivalent Yb(2), and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing SYb3Eu2 trigonal bipyramids. In the fourth S site, S(4) is bonded in a 6-coordinate geometry to three equivalent Yb(1), two equivalent Eu(1), and one S(2) atom. is represented by the CIF card [CIF]
data_Yb2EuS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.319
_cell_length_b   11.022
_cell_length_c   14.782
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   703.688
_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
  Yb  Yb0  1  0.250  0.434  0.386  1.0
  Yb  Yb1  1  0.250  0.934  0.114  1.0
  Yb  Yb2  1  0.750  0.566  0.614  1.0
  Yb  Yb3  1  0.750  0.066  0.886  1.0
  Yb  Yb4  1  0.250  0.406  0.890  1.0
  Yb  Yb5  1  0.250  0.906  0.610  1.0
  Yb  Yb6  1  0.750  0.594  0.110  1.0
  Yb  Yb7  1  0.750  0.094  0.390  1.0
  Eu  Eu8  1  0.250  0.767  0.316  1.0
  Eu  Eu9  1  0.250  0.267  0.184  1.0
  Eu  Eu10  1  0.750  0.233  0.684  1.0
  Eu  Eu11  1  0.750  0.733  0.816  1.0
  S  S12  1  0.250  0.186  0.818  1.0
  S  S13  1  0.250  0.686  0.682  1.0
  S  S14  1  0.750  0.814  0.182  1.0
  S  S15  1  0.750  0.314  0.318  1.0
  S  S16  1  0.250  0.187  0.527  1.0
  S  S17  1  0.250  0.687  0.973  1.0
  S  S18  1  0.750  0.813  0.473  1.0
  S  S19  1  0.750  0.313  0.027  1.0
  S  S20  1  0.250  0.032  0.291  1.0
  S  S21  1  0.250  0.532  0.209  1.0
  S  S22  1  0.750  0.968  0.709  1.0
  S  S23  1  0.750  0.468  0.791  1.0
  S  S24  1  0.250  0.374  0.579  1.0
  S  S25  1  0.250  0.874  0.921  1.0
  S  S26  1  0.750  0.626  0.421  1.0
  S  S27  1  0.750  0.126  0.079  1.0
[/CIF]
.