The structure described by SmFeNi4 crystallizes in the hexagonal P-6m2 space group. Sm(1) is bonded in a 18-coordinate geometry to three equivalent Fe(1), three equivalent Ni(1), and twelve equivalent Ni(2) atoms. Fe(1) is bonded to three equivalent Sm(1), three equivalent Ni(1), and six equivalent Ni(2) atoms to form distorted FeSm3Ni9 cuboctahedra that share corners with nine equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, corners with twelve equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra, edges with six equivalent Fe(1)Sm3Ni9 cuboctahedra, faces with two equivalent Fe(1)Sm3Ni9 cuboctahedra, faces with three equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, and faces with eighteen equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to three equivalent Sm(1), three equivalent Fe(1), and six equivalent Ni(2) atoms to form distorted NiSm3Fe3Ni6 cuboctahedra that share corners with nine equivalent Fe(1)Sm3Ni9 cuboctahedra, corners with twelve equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra, edges with six equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, faces with two equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, faces with three equivalent Fe(1)Sm3Ni9 cuboctahedra, and faces with eighteen equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra. In the second Ni site, Ni(2) is bonded to four equivalent Sm(1), two equivalent Fe(1), two equivalent Ni(1), and four equivalent Ni(2) atoms to form NiSm4Fe2Ni6 cuboctahedra that share corners with four equivalent Fe(1)Sm3Ni9 cuboctahedra, corners with four equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, corners with sixteen equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra, edges with ten equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra, faces with six equivalent Fe(1)Sm3Ni9 cuboctahedra, faces with six equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, and faces with ten equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_SmFeNi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.973
_cell_length_b   4.973
_cell_length_c   3.944
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   84.496
_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  0.667  0.333  0.000  1.0
  Fe  Fe1  1  0.000  0.000  0.000  1.0
  Ni  Ni2  1  0.333  0.667  0.000  1.0
  Ni  Ni3  1  0.666  0.833  0.500  1.0
  Ni  Ni4  1  0.167  0.833  0.500  1.0
  Ni  Ni5  1  0.167  0.334  0.500  1.0
[/CIF]
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The structure described by SmFeNi4 crystallizes in the hexagonal P-6m2 space group. Sm(1) is bonded in a 18-coordinate geometry to three equivalent Fe(1), three equivalent Ni(1), and twelve equivalent Ni(2) atoms. Fe(1) is bonded to three equivalent Sm(1), three equivalent Ni(1), and six equivalent Ni(2) atoms to form distorted FeSm3Ni9 cuboctahedra that share corners with nine equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, corners with twelve equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra, edges with six equivalent Fe(1)Sm3Ni9 cuboctahedra, faces with two equivalent Fe(1)Sm3Ni9 cuboctahedra, faces with three equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, and faces with eighteen equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to three equivalent Sm(1), three equivalent Fe(1), and six equivalent Ni(2) atoms to form distorted NiSm3Fe3Ni6 cuboctahedra that share corners with nine equivalent Fe(1)Sm3Ni9 cuboctahedra, corners with twelve equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra, edges with six equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, faces with two equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, faces with three equivalent Fe(1)Sm3Ni9 cuboctahedra, and faces with eighteen equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra. In the second Ni site, Ni(2) is bonded to four equivalent Sm(1), two equivalent Fe(1), two equivalent Ni(1), and four equivalent Ni(2) atoms to form NiSm4Fe2Ni6 cuboctahedra that share corners with four equivalent Fe(1)Sm3Ni9 cuboctahedra, corners with four equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, corners with sixteen equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra, edges with ten equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra, faces with six equivalent Fe(1)Sm3Ni9 cuboctahedra, faces with six equivalent Ni(1)Sm3Fe3Ni6 cuboctahedra, and faces with ten equivalent Ni(2)Sm4Fe2Ni6 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_SmFeNi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.973
_cell_length_b   4.973
_cell_length_c   3.944
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   84.496
_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  0.667  0.333  0.000  1.0
  Fe  Fe1  1  0.000  0.000  0.000  1.0
  Ni  Ni2  1  0.333  0.667  0.000  1.0
  Ni  Ni3  1  0.666  0.833  0.500  1.0
  Ni  Ni4  1  0.167  0.833  0.500  1.0
  Ni  Ni5  1  0.167  0.334  0.500  1.0
[/CIF]
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