The crystal structure described by Sm2NiSn4 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 10-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), two equivalent Sn(3), and four equivalent Sn(4) atoms. In the second Sm site, Sm(2) is bonded in a 14-coordinate geometry to four equivalent Ni(1), two equivalent Sn(1), two equivalent Sn(2), two equivalent Sn(4), and four equivalent Sn(3) atoms. Ni(1) is bonded in a 5-coordinate geometry to four equivalent Sm(2), one Sn(3), two equivalent Sn(1), and two equivalent Sn(2) atoms. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(1), and four equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(1), and four equivalent Sn(1) atoms. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ni(1), and two equivalent Sn(4) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), and two equivalent Sn(3) atoms. is represented by the CIF card [CIF]
data_Sm2NiSn4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.496
_cell_length_b   4.500
_cell_length_c   8.883
_cell_angle_alpha   90.000
_cell_angle_beta   75.343
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   173.839
_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  0.104  0.750  0.791  1.0
  Sm  Sm1  1  0.898  0.250  0.204  1.0
  Ni  Ni2  1  0.312  0.750  0.377  1.0
  Sn  Sn3  1  0.743  0.750  0.515  1.0
  Sn  Sn4  1  0.242  0.250  0.516  1.0
  Sn  Sn5  1  0.455  0.750  0.091  1.0
  Sn  Sn6  1  0.567  0.250  0.866  1.0
[/CIF]
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The crystal structure described by Sm2NiSn4 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 10-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), two equivalent Sn(3), and four equivalent Sn(4) atoms. In the second Sm site, Sm(2) is bonded in a 14-coordinate geometry to four equivalent Ni(1), two equivalent Sn(1), two equivalent Sn(2), two equivalent Sn(4), and four equivalent Sn(3) atoms. Ni(1) is bonded in a 5-coordinate geometry to four equivalent Sm(2), one Sn(3), two equivalent Sn(1), and two equivalent Sn(2) atoms. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(1), and four equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(1), and four equivalent Sn(1) atoms. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ni(1), and two equivalent Sn(4) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), and two equivalent Sn(3) atoms. is represented by the CIF card [CIF]
data_Sm2NiSn4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.496
_cell_length_b   4.500
_cell_length_c   8.883
_cell_angle_alpha   90.000
_cell_angle_beta   75.343
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   173.839
_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  0.104  0.750  0.791  1.0
  Sm  Sm1  1  0.898  0.250  0.204  1.0
  Ni  Ni2  1  0.312  0.750  0.377  1.0
  Sn  Sn3  1  0.743  0.750  0.515  1.0
  Sn  Sn4  1  0.242  0.250  0.516  1.0
  Sn  Sn5  1  0.455  0.750  0.091  1.0
  Sn  Sn6  1  0.567  0.250  0.866  1.0
[/CIF]
.