The structure described by Mg2Sm3MnS8 is Spinel-derived structured and crystallizes in the triclinic P-1 space group. Mg(1) is bonded to one S(1), one S(2), one S(3), and one S(4) atom to form MgS4 tetrahedra that share corners with three equivalent Sm(1)S6 octahedra, corners with three equivalent Sm(2)S6 octahedra, corners with three equivalent Sm(3)S6 octahedra, and corners with three equivalent Mn(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 49-61°. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms to form SmS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Sm(2)S6 octahedra, edges with two equivalent Sm(3)S6 octahedra, and edges with two equivalent Mn(1)S6 octahedra. In the second Sm site, Sm(2) is bonded to two equivalent S(1), two equivalent S(3), and two equivalent S(4) atoms to form SmS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Sm(1)S6 octahedra, edges with two equivalent Sm(3)S6 octahedra, and edges with two equivalent Mn(1)S6 octahedra. In the third Sm site, Sm(3) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(3) atoms to form SmS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Sm(1)S6 octahedra, edges with two equivalent Sm(2)S6 octahedra, and edges with two equivalent Mn(1)S6 octahedra. Mn(1) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(4) atoms to form MnS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Sm(1)S6 octahedra, edges with two equivalent Sm(2)S6 octahedra, and edges with two equivalent Sm(3)S6 octahedra. There are four inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Sm(2), one Sm(3), and one Mn(1) atom. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Sm(1), one Sm(3), and one Mn(1) atom. In the third S site, S(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Sm(1), one Sm(2), and one Sm(3) atom. In the fourth S site, S(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Sm(1), one Sm(2), and one Mn(1) atom. is represented by the CIF file [CIF]
data_Sm3Mg2MnS8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.934
_cell_length_b   7.824
_cell_length_c   7.941
_cell_angle_alpha   59.311
_cell_angle_beta   60.134
_cell_angle_gamma   59.420
_symmetry_Int_Tables_number   1
_cell_volume   345.521
_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
  Sm  Sm0  1  0.500  0.500  0.500  1.0
  Sm  Sm1  1  0.500  0.500  1.000  1.0
  Sm  Sm2  1  0.000  0.500  0.500  1.0
  Mg  Mg3  1  0.875  0.876  0.875  1.0
  Mg  Mg4  1  0.125  0.124  0.125  1.0
  Mn  Mn5  1  0.500  0.000  0.500  1.0
  S  S6  1  0.730  0.773  0.729  1.0
  S  S7  1  0.268  0.230  0.734  1.0
  S  S8  1  0.253  0.741  0.253  1.0
  S  S9  1  0.733  0.228  0.270  1.0
  S  S10  1  0.747  0.259  0.747  1.0
  S  S11  1  0.267  0.772  0.730  1.0
  S  S12  1  0.270  0.227  0.271  1.0
  S  S13  1  0.732  0.770  0.266  1.0
[/CIF]
.
The structure described by Mg2Sm3MnS8 is Spinel-derived structured and crystallizes in the triclinic P-1 space group. Mg(1) is bonded to one S(1), one S(2), one S(3), and one S(4) atom to form MgS4 tetrahedra that share corners with three equivalent Sm(1)S6 octahedra, corners with three equivalent Sm(2)S6 octahedra, corners with three equivalent Sm(3)S6 octahedra, and corners with three equivalent Mn(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 49-61°. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms to form SmS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Sm(2)S6 octahedra, edges with two equivalent Sm(3)S6 octahedra, and edges with two equivalent Mn(1)S6 octahedra. In the second Sm site, Sm(2) is bonded to two equivalent S(1), two equivalent S(3), and two equivalent S(4) atoms to form SmS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Sm(1)S6 octahedra, edges with two equivalent Sm(3)S6 octahedra, and edges with two equivalent Mn(1)S6 octahedra. In the third Sm site, Sm(3) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(3) atoms to form SmS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Sm(1)S6 octahedra, edges with two equivalent Sm(2)S6 octahedra, and edges with two equivalent Mn(1)S6 octahedra. Mn(1) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(4) atoms to form MnS6 octahedra that share corners with six equivalent Mg(1)S4 tetrahedra, edges with two equivalent Sm(1)S6 octahedra, edges with two equivalent Sm(2)S6 octahedra, and edges with two equivalent Sm(3)S6 octahedra. There are four inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Sm(2), one Sm(3), and one Mn(1) atom. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Sm(1), one Sm(3), and one Mn(1) atom. In the third S site, S(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Sm(1), one Sm(2), and one Sm(3) atom. In the fourth S site, S(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Sm(1), one Sm(2), and one Mn(1) atom. is represented by the CIF file [CIF]
data_Sm3Mg2MnS8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.934
_cell_length_b   7.824
_cell_length_c   7.941
_cell_angle_alpha   59.311
_cell_angle_beta   60.134
_cell_angle_gamma   59.420
_symmetry_Int_Tables_number   1
_cell_volume   345.521
_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
  Sm  Sm0  1  0.500  0.500  0.500  1.0
  Sm  Sm1  1  0.500  0.500  1.000  1.0
  Sm  Sm2  1  0.000  0.500  0.500  1.0
  Mg  Mg3  1  0.875  0.876  0.875  1.0
  Mg  Mg4  1  0.125  0.124  0.125  1.0
  Mn  Mn5  1  0.500  0.000  0.500  1.0
  S  S6  1  0.730  0.773  0.729  1.0
  S  S7  1  0.268  0.230  0.734  1.0
  S  S8  1  0.253  0.741  0.253  1.0
  S  S9  1  0.733  0.228  0.270  1.0
  S  S10  1  0.747  0.259  0.747  1.0
  S  S11  1  0.267  0.772  0.730  1.0
  S  S12  1  0.270  0.227  0.271  1.0
  S  S13  1  0.732  0.770  0.266  1.0
[/CIF]
.