The material described by Eu3F4S2 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a body-centered cubic geometry to eight equivalent F(1) atoms. In the second Eu site, Eu(2) is bonded in a 9-coordinate geometry to five equivalent S(1) and four equivalent F(1) atoms. S(1) is bonded to five equivalent Eu(2) atoms to form distorted SEu5 trigonal bipyramids that share corners with twelve equivalent F(1)Eu4 tetrahedra, corners with four equivalent S(1)Eu5 trigonal bipyramids, edges with four equivalent F(1)Eu4 tetrahedra, and edges with eight equivalent S(1)Eu5 trigonal bipyramids. F(1) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form FEu4 tetrahedra that share corners with ten equivalent F(1)Eu4 tetrahedra, corners with six equivalent S(1)Eu5 trigonal bipyramids, edges with five equivalent F(1)Eu4 tetrahedra, and edges with two equivalent S(1)Eu5 trigonal bipyramids. is represented by the CIF file [CIF]
data_Eu3(SF2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.169
_cell_length_b   10.169
_cell_length_c   10.169
_cell_angle_alpha   157.422
_cell_angle_beta   157.422
_cell_angle_gamma   32.143
_symmetry_Int_Tables_number   1
_cell_volume   154.862
_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
  Eu  Eu0  1  0.000  0.000  0.000  1.0
  Eu  Eu1  1  0.658  0.658  0.000  1.0
  Eu  Eu2  1  0.342  0.342  0.000  1.0
  S  S3  1  0.803  0.803  0.000  1.0
  S  S4  1  0.197  0.197  0.000  1.0
  F  F5  1  0.570  0.070  0.500  1.0
  F  F6  1  0.070  0.570  0.500  1.0
  F  F7  1  0.430  0.930  0.500  1.0
  F  F8  1  0.930  0.430  0.500  1.0
[/CIF]
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The material described by Eu3F4S2 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a body-centered cubic geometry to eight equivalent F(1) atoms. In the second Eu site, Eu(2) is bonded in a 9-coordinate geometry to five equivalent S(1) and four equivalent F(1) atoms. S(1) is bonded to five equivalent Eu(2) atoms to form distorted SEu5 trigonal bipyramids that share corners with twelve equivalent F(1)Eu4 tetrahedra, corners with four equivalent S(1)Eu5 trigonal bipyramids, edges with four equivalent F(1)Eu4 tetrahedra, and edges with eight equivalent S(1)Eu5 trigonal bipyramids. F(1) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form FEu4 tetrahedra that share corners with ten equivalent F(1)Eu4 tetrahedra, corners with six equivalent S(1)Eu5 trigonal bipyramids, edges with five equivalent F(1)Eu4 tetrahedra, and edges with two equivalent S(1)Eu5 trigonal bipyramids. is represented by the CIF file [CIF]
data_Eu3(SF2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.169
_cell_length_b   10.169
_cell_length_c   10.169
_cell_angle_alpha   157.422
_cell_angle_beta   157.422
_cell_angle_gamma   32.143
_symmetry_Int_Tables_number   1
_cell_volume   154.862
_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
  Eu  Eu0  1  0.000  0.000  0.000  1.0
  Eu  Eu1  1  0.658  0.658  0.000  1.0
  Eu  Eu2  1  0.342  0.342  0.000  1.0
  S  S3  1  0.803  0.803  0.000  1.0
  S  S4  1  0.197  0.197  0.000  1.0
  F  F5  1  0.570  0.070  0.500  1.0
  F  F6  1  0.070  0.570  0.500  1.0
  F  F7  1  0.430  0.930  0.500  1.0
  F  F8  1  0.930  0.430  0.500  1.0
[/CIF]
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