The material structure described by Sm3Pt7Sb4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Pt(2), four equivalent Pt(1), two equivalent Sb(1), and four equivalent Sb(2) atoms to form distorted SmSb6Pt6 cuboctahedra that share edges with two equivalent Pt(3)Sm4Sb2Pt6 cuboctahedra and faces with two equivalent Sm(1)Sb6Pt6 cuboctahedra. In the second Sm site, Sm(2) is bonded in a 12-coordinate geometry to two equivalent Pt(1), two equivalent Pt(2), two equivalent Pt(3), two equivalent Pt(4), two equivalent Sb(1), and three equivalent Sb(2) atoms. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Pt(4), one Sb(2), and three equivalent Sb(1) atoms. In the second Pt site, Pt(2) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Sm(2), one Pt(3), two equivalent Pt(4), and three equivalent Sb(2) atoms. In the third Pt site, Pt(3) is bonded to four equivalent Sm(2), two equivalent Pt(2), four equivalent Pt(4), and two equivalent Sb(1) atoms to form distorted PtSm4Sb2Pt6 cuboctahedra that share edges with two equivalent Sm(1)Sb6Pt6 cuboctahedra and faces with two equivalent Pt(3)Sm4Sb2Pt6 cuboctahedra. In the fourth Pt site, Pt(4) is bonded in a 10-coordinate geometry to two equivalent Sm(2), one Pt(1), two equivalent Pt(2), two equivalent Pt(3), one Sb(2), and two equivalent Sb(1) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Sm(2), one Pt(3), two equivalent Pt(4), and three equivalent Pt(1) atoms. In the second Sb site, Sb(2) is bonded in a 10-coordinate geometry to two equivalent Sm(1), three equivalent Sm(2), one Pt(1), one Pt(4), and three equivalent Pt(2) atoms. is represented by the CIF file [CIF]
data_Sm3Sb4Pt7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.273
_cell_length_b   8.560
_cell_length_c   8.591
_cell_angle_alpha   75.406
_cell_angle_beta   75.599
_cell_angle_gamma   75.545
_symmetry_Int_Tables_number   1
_cell_volume   288.651
_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  0.000  0.000  1.0
  Sm  Sm1  1  0.171  0.342  0.315  1.0
  Sm  Sm2  1  0.829  0.658  0.685  1.0
  Sb  Sb3  1  0.360  0.870  0.410  1.0
  Sb  Sb4  1  0.829  0.318  0.024  1.0
  Sb  Sb5  1  0.171  0.682  0.976  1.0
  Sb  Sb6  1  0.640  0.130  0.590  1.0
  Pt  Pt7  1  0.170  0.930  0.731  1.0
  Pt  Pt8  1  0.377  0.401  0.845  1.0
  Pt  Pt9  1  0.500  0.500  0.500  1.0
  Pt  Pt10  1  0.830  0.070  0.269  1.0
  Pt  Pt11  1  0.017  0.292  0.673  1.0
  Pt  Pt12  1  0.983  0.708  0.327  1.0
  Pt  Pt13  1  0.623  0.599  0.155  1.0
[/CIF]
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The material structure described by Sm3Pt7Sb4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Pt(2), four equivalent Pt(1), two equivalent Sb(1), and four equivalent Sb(2) atoms to form distorted SmSb6Pt6 cuboctahedra that share edges with two equivalent Pt(3)Sm4Sb2Pt6 cuboctahedra and faces with two equivalent Sm(1)Sb6Pt6 cuboctahedra. In the second Sm site, Sm(2) is bonded in a 12-coordinate geometry to two equivalent Pt(1), two equivalent Pt(2), two equivalent Pt(3), two equivalent Pt(4), two equivalent Sb(1), and three equivalent Sb(2) atoms. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Pt(4), one Sb(2), and three equivalent Sb(1) atoms. In the second Pt site, Pt(2) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Sm(2), one Pt(3), two equivalent Pt(4), and three equivalent Sb(2) atoms. In the third Pt site, Pt(3) is bonded to four equivalent Sm(2), two equivalent Pt(2), four equivalent Pt(4), and two equivalent Sb(1) atoms to form distorted PtSm4Sb2Pt6 cuboctahedra that share edges with two equivalent Sm(1)Sb6Pt6 cuboctahedra and faces with two equivalent Pt(3)Sm4Sb2Pt6 cuboctahedra. In the fourth Pt site, Pt(4) is bonded in a 10-coordinate geometry to two equivalent Sm(2), one Pt(1), two equivalent Pt(2), two equivalent Pt(3), one Sb(2), and two equivalent Sb(1) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Sm(2), one Pt(3), two equivalent Pt(4), and three equivalent Pt(1) atoms. In the second Sb site, Sb(2) is bonded in a 10-coordinate geometry to two equivalent Sm(1), three equivalent Sm(2), one Pt(1), one Pt(4), and three equivalent Pt(2) atoms. is represented by the CIF file [CIF]
data_Sm3Sb4Pt7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.273
_cell_length_b   8.560
_cell_length_c   8.591
_cell_angle_alpha   75.406
_cell_angle_beta   75.599
_cell_angle_gamma   75.545
_symmetry_Int_Tables_number   1
_cell_volume   288.651
_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  0.000  0.000  1.0
  Sm  Sm1  1  0.171  0.342  0.315  1.0
  Sm  Sm2  1  0.829  0.658  0.685  1.0
  Sb  Sb3  1  0.360  0.870  0.410  1.0
  Sb  Sb4  1  0.829  0.318  0.024  1.0
  Sb  Sb5  1  0.171  0.682  0.976  1.0
  Sb  Sb6  1  0.640  0.130  0.590  1.0
  Pt  Pt7  1  0.170  0.930  0.731  1.0
  Pt  Pt8  1  0.377  0.401  0.845  1.0
  Pt  Pt9  1  0.500  0.500  0.500  1.0
  Pt  Pt10  1  0.830  0.070  0.269  1.0
  Pt  Pt11  1  0.017  0.292  0.673  1.0
  Pt  Pt12  1  0.983  0.708  0.327  1.0
  Pt  Pt13  1  0.623  0.599  0.155  1.0
[/CIF]
.