The crystal structure described by Sm2PtSi3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Pt(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms to form SmSi10Pt2 cuboctahedra that share edges with four equivalent Sm(1)Si10Pt2 cuboctahedra, edges with eight equivalent Sm(2)Si8Pt4 cuboctahedra, faces with four equivalent Sm(1)Si10Pt2 cuboctahedra, and faces with four equivalent Sm(2)Si8Pt4 cuboctahedra. In the second Sm site, Sm(2) is bonded to four equivalent Pt(1), two equivalent Si(1), two equivalent Si(2), and four equivalent Si(3) atoms to form SmSi8Pt4 cuboctahedra that share edges with four equivalent Sm(2)Si8Pt4 cuboctahedra, edges with eight equivalent Sm(1)Si10Pt2 cuboctahedra, faces with four equivalent Sm(1)Si10Pt2 cuboctahedra, and faces with four equivalent Sm(2)Si8Pt4 cuboctahedra. Pt(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Si(3), and two equivalent Si(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), one Si(2), and two equivalent Si(3) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), two equivalent Pt(1), and one Si(1) atom. In the third Si site, Si(3) is bonded in a distorted single-bond geometry to two equivalent Sm(1), four equivalent Sm(2), one Pt(1), and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Sm2Si3Pt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.692
_cell_length_b   7.692
_cell_length_c   7.692
_cell_angle_alpha   149.348
_cell_angle_beta   148.342
_cell_angle_gamma   44.645
_symmetry_Int_Tables_number   1
_cell_volume   121.426
_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  0.128  0.128  0.000  1.0
  Sm  Sm1  1  0.372  0.872  0.500  1.0
  Si  Si2  1  0.705  0.705  0.000  1.0
  Si  Si3  1  0.540  0.540  0.000  1.0
  Si  Si4  1  0.794  0.294  0.500  1.0
  Pt  Pt5  1  0.959  0.459  0.500  1.0
[/CIF]
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The crystal structure described by Sm2PtSi3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Pt(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms to form SmSi10Pt2 cuboctahedra that share edges with four equivalent Sm(1)Si10Pt2 cuboctahedra, edges with eight equivalent Sm(2)Si8Pt4 cuboctahedra, faces with four equivalent Sm(1)Si10Pt2 cuboctahedra, and faces with four equivalent Sm(2)Si8Pt4 cuboctahedra. In the second Sm site, Sm(2) is bonded to four equivalent Pt(1), two equivalent Si(1), two equivalent Si(2), and four equivalent Si(3) atoms to form SmSi8Pt4 cuboctahedra that share edges with four equivalent Sm(2)Si8Pt4 cuboctahedra, edges with eight equivalent Sm(1)Si10Pt2 cuboctahedra, faces with four equivalent Sm(1)Si10Pt2 cuboctahedra, and faces with four equivalent Sm(2)Si8Pt4 cuboctahedra. Pt(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Si(3), and two equivalent Si(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), one Si(2), and two equivalent Si(3) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), two equivalent Pt(1), and one Si(1) atom. In the third Si site, Si(3) is bonded in a distorted single-bond geometry to two equivalent Sm(1), four equivalent Sm(2), one Pt(1), and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Sm2Si3Pt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.692
_cell_length_b   7.692
_cell_length_c   7.692
_cell_angle_alpha   149.348
_cell_angle_beta   148.342
_cell_angle_gamma   44.645
_symmetry_Int_Tables_number   1
_cell_volume   121.426
_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  0.128  0.128  0.000  1.0
  Sm  Sm1  1  0.372  0.872  0.500  1.0
  Si  Si2  1  0.705  0.705  0.000  1.0
  Si  Si3  1  0.540  0.540  0.000  1.0
  Si  Si4  1  0.794  0.294  0.500  1.0
  Pt  Pt5  1  0.959  0.459  0.500  1.0
[/CIF]
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