The crystal structure described by EuSm2S4 crystallizes in the tetragonal I-42d space group. Eu(1) is bonded to eight equivalent S(1) atoms to form distorted EuS8 hexagonal bipyramids that share corners with eight equivalent Sm(1)S8 hexagonal bipyramids, edges with four equivalent Eu(1)S8 hexagonal bipyramids, and faces with eight equivalent Sm(1)S8 hexagonal bipyramids. Sm(1) is bonded to eight equivalent S(1) atoms to form distorted SmS8 hexagonal bipyramids that share corners with four equivalent Eu(1)S8 hexagonal bipyramids, corners with four equivalent Sm(1)S8 hexagonal bipyramids, edges with four equivalent Sm(1)S8 hexagonal bipyramids, faces with four equivalent Eu(1)S8 hexagonal bipyramids, and faces with four equivalent Sm(1)S8 hexagonal bipyramids. S(1) is bonded to two equivalent Eu(1) and four equivalent Sm(1) atoms to form a mixture of distorted corner, face, and edge-sharing SSm4Eu2 octahedra. The corner-sharing octahedral tilt angles range from 16-50°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm2EuS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.409
_cell_length_b   7.409
_cell_length_c   7.409
_cell_angle_alpha   109.353
_cell_angle_beta   109.353
_cell_angle_gamma   109.707
_symmetry_Int_Tables_number   1
_cell_volume   313.083
_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
  Sm  Sm0  1  0.123  0.750  0.873  1.0
  Sm  Sm1  1  0.250  0.623  0.373  1.0
  Sm  Sm2  1  0.377  0.250  0.627  1.0
  Sm  Sm3  1  0.750  0.877  0.127  1.0
  Eu  Eu4  1  0.625  0.375  0.250  1.0
  Eu  Eu5  1  0.875  0.125  0.750  1.0
  S  S6  1  0.007  0.858  0.499  1.0
  S  S7  1  0.008  0.359  0.501  1.0
  S  S8  1  0.493  0.992  0.850  1.0
  S  S9  1  0.142  0.141  0.150  1.0
  S  S10  1  0.358  0.507  0.999  1.0
  S  S11  1  0.641  0.642  0.650  1.0
  S  S12  1  0.492  0.993  0.350  1.0
  S  S13  1  0.859  0.508  0.001  1.0
[/CIF]
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The crystal structure described by EuSm2S4 crystallizes in the tetragonal I-42d space group. Eu(1) is bonded to eight equivalent S(1) atoms to form distorted EuS8 hexagonal bipyramids that share corners with eight equivalent Sm(1)S8 hexagonal bipyramids, edges with four equivalent Eu(1)S8 hexagonal bipyramids, and faces with eight equivalent Sm(1)S8 hexagonal bipyramids. Sm(1) is bonded to eight equivalent S(1) atoms to form distorted SmS8 hexagonal bipyramids that share corners with four equivalent Eu(1)S8 hexagonal bipyramids, corners with four equivalent Sm(1)S8 hexagonal bipyramids, edges with four equivalent Sm(1)S8 hexagonal bipyramids, faces with four equivalent Eu(1)S8 hexagonal bipyramids, and faces with four equivalent Sm(1)S8 hexagonal bipyramids. S(1) is bonded to two equivalent Eu(1) and four equivalent Sm(1) atoms to form a mixture of distorted corner, face, and edge-sharing SSm4Eu2 octahedra. The corner-sharing octahedral tilt angles range from 16-50°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm2EuS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.409
_cell_length_b   7.409
_cell_length_c   7.409
_cell_angle_alpha   109.353
_cell_angle_beta   109.353
_cell_angle_gamma   109.707
_symmetry_Int_Tables_number   1
_cell_volume   313.083
_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
  Sm  Sm0  1  0.123  0.750  0.873  1.0
  Sm  Sm1  1  0.250  0.623  0.373  1.0
  Sm  Sm2  1  0.377  0.250  0.627  1.0
  Sm  Sm3  1  0.750  0.877  0.127  1.0
  Eu  Eu4  1  0.625  0.375  0.250  1.0
  Eu  Eu5  1  0.875  0.125  0.750  1.0
  S  S6  1  0.007  0.858  0.499  1.0
  S  S7  1  0.008  0.359  0.501  1.0
  S  S8  1  0.493  0.992  0.850  1.0
  S  S9  1  0.142  0.141  0.150  1.0
  S  S10  1  0.358  0.507  0.999  1.0
  S  S11  1  0.641  0.642  0.650  1.0
  S  S12  1  0.492  0.993  0.350  1.0
  S  S13  1  0.859  0.508  0.001  1.0
[/CIF]
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