The structure described by Sm2Sn5 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Sn(1), two equivalent Sn(3), two equivalent Sn(5), two equivalent Sn(6), and four equivalent Sn(4) atoms to form SmSn12 cuboctahedra that share corners with eight equivalent Sm(1)Sn12 cuboctahedra, edges with four equivalent Sn(6)Sm4Sn8 cuboctahedra, faces with two equivalent Sn(6)Sm4Sn8 cuboctahedra, and faces with five equivalent Sm(1)Sn12 cuboctahedra. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to two equivalent Sn(1), two equivalent Sn(5), and six equivalent Sn(2) atoms. There are six inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Sn(4), and four equivalent Sn(5) atoms. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to six equivalent Sm(2) and two equivalent Sn(2) atoms. In the third Sn site, Sn(3) is bonded in a 4-coordinate geometry to four equivalent Sm(1) and four equivalent Sn(6) atoms. In the fourth Sn site, Sn(4) is bonded in a distorted square co-planar geometry to four equivalent Sm(1), two equivalent Sn(1), two equivalent Sn(5), and two equivalent Sn(6) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Sn(4), and four equivalent Sn(1) atoms. In the sixth Sn site, Sn(6) is bonded to four equivalent Sm(1), four equivalent Sn(3), and four equivalent Sn(4) atoms to form distorted SnSm4Sn8 cuboctahedra that share corners with four equivalent Sn(6)Sm4Sn8 cuboctahedra, edges with eight equivalent Sm(1)Sn12 cuboctahedra, faces with four equivalent Sm(1)Sn12 cuboctahedra, and faces with four equivalent Sn(6)Sm4Sn8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm2Sn5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.569
_cell_length_b   4.637
_cell_length_c   17.816
_cell_angle_alpha   90.000
_cell_angle_beta   97.368
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   374.418
_cell_formula_units_Z   2
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  0.930  0.500  0.861  1.0
  Sm  Sm1  1  0.070  0.500  0.139  1.0
  Sm  Sm2  1  0.797  0.500  0.594  1.0
  Sm  Sm3  1  0.203  0.500  0.406  1.0
  Sn  Sn4  1  0.638  0.500  0.276  1.0
  Sn  Sn5  1  0.362  0.500  0.724  1.0
  Sn  Sn6  1  0.722  0.000  0.444  1.0
  Sn  Sn7  1  0.278  0.000  0.556  1.0
  Sn  Sn8  1  0.500  0.500  0.000  1.0
  Sn  Sn9  1  0.572  0.000  0.143  1.0
  Sn  Sn10  1  0.428  0.000  0.857  1.0
  Sn  Sn11  1  0.862  0.000  0.723  1.0
  Sn  Sn12  1  0.138  0.000  0.277  1.0
  Sn  Sn13  1  0.000  0.000  0.000  1.0
[/CIF]
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The structure described by Sm2Sn5 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Sn(1), two equivalent Sn(3), two equivalent Sn(5), two equivalent Sn(6), and four equivalent Sn(4) atoms to form SmSn12 cuboctahedra that share corners with eight equivalent Sm(1)Sn12 cuboctahedra, edges with four equivalent Sn(6)Sm4Sn8 cuboctahedra, faces with two equivalent Sn(6)Sm4Sn8 cuboctahedra, and faces with five equivalent Sm(1)Sn12 cuboctahedra. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to two equivalent Sn(1), two equivalent Sn(5), and six equivalent Sn(2) atoms. There are six inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Sn(4), and four equivalent Sn(5) atoms. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to six equivalent Sm(2) and two equivalent Sn(2) atoms. In the third Sn site, Sn(3) is bonded in a 4-coordinate geometry to four equivalent Sm(1) and four equivalent Sn(6) atoms. In the fourth Sn site, Sn(4) is bonded in a distorted square co-planar geometry to four equivalent Sm(1), two equivalent Sn(1), two equivalent Sn(5), and two equivalent Sn(6) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Sn(4), and four equivalent Sn(1) atoms. In the sixth Sn site, Sn(6) is bonded to four equivalent Sm(1), four equivalent Sn(3), and four equivalent Sn(4) atoms to form distorted SnSm4Sn8 cuboctahedra that share corners with four equivalent Sn(6)Sm4Sn8 cuboctahedra, edges with eight equivalent Sm(1)Sn12 cuboctahedra, faces with four equivalent Sm(1)Sn12 cuboctahedra, and faces with four equivalent Sn(6)Sm4Sn8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm2Sn5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.569
_cell_length_b   4.637
_cell_length_c   17.816
_cell_angle_alpha   90.000
_cell_angle_beta   97.368
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   374.418
_cell_formula_units_Z   2
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  0.930  0.500  0.861  1.0
  Sm  Sm1  1  0.070  0.500  0.139  1.0
  Sm  Sm2  1  0.797  0.500  0.594  1.0
  Sm  Sm3  1  0.203  0.500  0.406  1.0
  Sn  Sn4  1  0.638  0.500  0.276  1.0
  Sn  Sn5  1  0.362  0.500  0.724  1.0
  Sn  Sn6  1  0.722  0.000  0.444  1.0
  Sn  Sn7  1  0.278  0.000  0.556  1.0
  Sn  Sn8  1  0.500  0.500  0.000  1.0
  Sn  Sn9  1  0.572  0.000  0.143  1.0
  Sn  Sn10  1  0.428  0.000  0.857  1.0
  Sn  Sn11  1  0.862  0.000  0.723  1.0
  Sn  Sn12  1  0.138  0.000  0.277  1.0
  Sn  Sn13  1  0.000  0.000  0.000  1.0
[/CIF]
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