The structure described by SmMn2Si2 crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 16-coordinate geometry to eight equivalent Mn(1) and eight equivalent Si(1) atoms. Mn(1) is bonded to four equivalent Sm(1) and four equivalent Si(1) atoms to form a mixture of corner, edge, and face-sharing MnSm4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), four equivalent Mn(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Sm(MnSi)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.926
_cell_length_b   3.926
_cell_length_c   5.983
_cell_angle_alpha   109.155
_cell_angle_beta   109.155
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   81.693
_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  0.000  0.000  0.000  1.0
  Mn  Mn1  1  0.750  0.250  0.500  1.0
  Mn  Mn2  1  0.250  0.750  0.500  1.0
  Si  Si3  1  0.619  0.619  0.238  1.0
  Si  Si4  1  0.381  0.381  0.762  1.0
[/CIF]
.
The structure described by SmMn2Si2 crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 16-coordinate geometry to eight equivalent Mn(1) and eight equivalent Si(1) atoms. Mn(1) is bonded to four equivalent Sm(1) and four equivalent Si(1) atoms to form a mixture of corner, edge, and face-sharing MnSm4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), four equivalent Mn(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Sm(MnSi)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.926
_cell_length_b   3.926
_cell_length_c   5.983
_cell_angle_alpha   109.155
_cell_angle_beta   109.155
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   81.693
_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  0.000  0.000  0.000  1.0
  Mn  Mn1  1  0.750  0.250  0.500  1.0
  Mn  Mn2  1  0.250  0.750  0.500  1.0
  Si  Si3  1  0.619  0.619  0.238  1.0
  Si  Si4  1  0.381  0.381  0.762  1.0
[/CIF]
.