The crystal structure described by MgEu2S4 is Spinel-like structured and crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded to one S(2), one S(3), and two equivalent S(1) atoms to form MgS4 tetrahedra that share corners with two equivalent Eu(1)S6 octahedra, corners with four equivalent Eu(2)S6 octahedra,  an edgeedge with one Eu(2)S6 octahedra, and edges with two equivalent Eu(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 59-65°. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(3) atoms to form EuS6 octahedra that share corners with four equivalent Eu(2)S6 octahedra, corners with two equivalent Mg(1)S4 tetrahedra, edges with two equivalent Eu(1)S6 octahedra, edges with two equivalent Eu(2)S6 octahedra, and edges with two equivalent Mg(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-56°. In the second Eu site, Eu(2) is bonded to one S(2), one S(3), and four equivalent S(1) atoms to form EuS6 octahedra that share corners with four equivalent Eu(1)S6 octahedra, corners with four equivalent Eu(2)S6 octahedra, corners with four equivalent Mg(1)S4 tetrahedra, edges with two equivalent Eu(1)S6 octahedra, and  an edgeedge with one Mg(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-56°. There are three inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Eu(1), and two equivalent Eu(2) atoms. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Eu(2), and two equivalent Eu(1) atoms. In the third S site, S(3) is bonded to one Mg(1), one Eu(2), and two equivalent Eu(1) atoms to form distorted corner-sharing SEu3Mg trigonal pyramids. is represented by the CIF card [CIF]
data_Eu2MgS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.910
_cell_length_b   8.135
_cell_length_c   6.676
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   755.434
_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
  Eu  Eu0  1  0.000  0.000  0.500  1.0
  Eu  Eu1  1  0.500  0.000  0.000  1.0
  Eu  Eu2  1  0.500  0.500  0.000  1.0
  Eu  Eu3  1  0.000  0.500  0.500  1.0
  Eu  Eu4  1  0.232  0.750  0.001  1.0
  Eu  Eu5  1  0.768  0.250  0.999  1.0
  Eu  Eu6  1  0.268  0.250  0.501  1.0
  Eu  Eu7  1  0.732  0.750  0.499  1.0
  Mg  Mg8  1  0.093  0.250  0.926  1.0
  Mg  Mg9  1  0.907  0.750  0.074  1.0
  Mg  Mg10  1  0.407  0.750  0.426  1.0
  Mg  Mg11  1  0.593  0.250  0.574  1.0
  S  S12  1  0.167  0.016  0.749  1.0
  S  S13  1  0.833  0.984  0.251  1.0
  S  S14  1  0.333  0.984  0.249  1.0
  S  S15  1  0.667  0.016  0.751  1.0
  S  S16  1  0.667  0.484  0.751  1.0
  S  S17  1  0.333  0.516  0.249  1.0
  S  S18  1  0.833  0.516  0.251  1.0
  S  S19  1  0.167  0.484  0.749  1.0
  S  S20  1  0.067  0.750  0.244  1.0
  S  S21  1  0.933  0.250  0.756  1.0
  S  S22  1  0.433  0.250  0.744  1.0
  S  S23  1  0.567  0.750  0.256  1.0
  S  S24  1  0.091  0.250  0.286  1.0
  S  S25  1  0.909  0.750  0.714  1.0
  S  S26  1  0.409  0.750  0.786  1.0
  S  S27  1  0.591  0.250  0.214  1.0
[/CIF]
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The crystal structure described by MgEu2S4 is Spinel-like structured and crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded to one S(2), one S(3), and two equivalent S(1) atoms to form MgS4 tetrahedra that share corners with two equivalent Eu(1)S6 octahedra, corners with four equivalent Eu(2)S6 octahedra,  an edgeedge with one Eu(2)S6 octahedra, and edges with two equivalent Eu(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 59-65°. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(3) atoms to form EuS6 octahedra that share corners with four equivalent Eu(2)S6 octahedra, corners with two equivalent Mg(1)S4 tetrahedra, edges with two equivalent Eu(1)S6 octahedra, edges with two equivalent Eu(2)S6 octahedra, and edges with two equivalent Mg(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-56°. In the second Eu site, Eu(2) is bonded to one S(2), one S(3), and four equivalent S(1) atoms to form EuS6 octahedra that share corners with four equivalent Eu(1)S6 octahedra, corners with four equivalent Eu(2)S6 octahedra, corners with four equivalent Mg(1)S4 tetrahedra, edges with two equivalent Eu(1)S6 octahedra, and  an edgeedge with one Mg(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-56°. There are three inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Eu(1), and two equivalent Eu(2) atoms. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Eu(2), and two equivalent Eu(1) atoms. In the third S site, S(3) is bonded to one Mg(1), one Eu(2), and two equivalent Eu(1) atoms to form distorted corner-sharing SEu3Mg trigonal pyramids. is represented by the CIF card [CIF]
data_Eu2MgS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.910
_cell_length_b   8.135
_cell_length_c   6.676
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   755.434
_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
  Eu  Eu0  1  0.000  0.000  0.500  1.0
  Eu  Eu1  1  0.500  0.000  0.000  1.0
  Eu  Eu2  1  0.500  0.500  0.000  1.0
  Eu  Eu3  1  0.000  0.500  0.500  1.0
  Eu  Eu4  1  0.232  0.750  0.001  1.0
  Eu  Eu5  1  0.768  0.250  0.999  1.0
  Eu  Eu6  1  0.268  0.250  0.501  1.0
  Eu  Eu7  1  0.732  0.750  0.499  1.0
  Mg  Mg8  1  0.093  0.250  0.926  1.0
  Mg  Mg9  1  0.907  0.750  0.074  1.0
  Mg  Mg10  1  0.407  0.750  0.426  1.0
  Mg  Mg11  1  0.593  0.250  0.574  1.0
  S  S12  1  0.167  0.016  0.749  1.0
  S  S13  1  0.833  0.984  0.251  1.0
  S  S14  1  0.333  0.984  0.249  1.0
  S  S15  1  0.667  0.016  0.751  1.0
  S  S16  1  0.667  0.484  0.751  1.0
  S  S17  1  0.333  0.516  0.249  1.0
  S  S18  1  0.833  0.516  0.251  1.0
  S  S19  1  0.167  0.484  0.749  1.0
  S  S20  1  0.067  0.750  0.244  1.0
  S  S21  1  0.933  0.250  0.756  1.0
  S  S22  1  0.433  0.250  0.744  1.0
  S  S23  1  0.567  0.750  0.256  1.0
  S  S24  1  0.091  0.250  0.286  1.0
  S  S25  1  0.909  0.750  0.714  1.0
  S  S26  1  0.409  0.750  0.786  1.0
  S  S27  1  0.591  0.250  0.214  1.0
[/CIF]
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