The material described by Sm4Ni7Si9 crystallizes in the monoclinic C2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 17-coordinate geometry to one Ni(3), one Ni(4), one Ni(5), two equivalent Ni(1), three equivalent Ni(2), one Si(3), one Si(4), one Si(5), one Si(6), one Si(7), two equivalent Si(1), and two equivalent Si(2) atoms. In the second Sm site, Sm(2) is bonded in a 17-coordinate geometry to one Ni(3), one Ni(4), one Ni(5), two equivalent Ni(2), three equivalent Ni(1), one Si(3), one Si(4), one Si(5), one Si(6), one Si(7), two equivalent Si(1), and two equivalent Si(2) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(5) is bonded in a 11-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(4), two equivalent Ni(1), two equivalent Si(2), and two equivalent Si(7) atoms. In the second Ni site, Ni(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), three equivalent Sm(2), one Ni(5), one Si(1), one Si(3), one Si(4), and one Si(7) atom. In the third Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent Sm(2), three equivalent Sm(1), one Si(2), one Si(3), one Si(4), one Si(5), and one Si(6) atom. In the fourth Ni site, Ni(3) is bonded in a 12-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(4), one Si(6), one Si(7), two equivalent Si(1), and two equivalent Si(2) atoms. In the fifth Ni site, Ni(4) is bonded in a 12-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(5), two equivalent Ni(3), one Si(5), two equivalent Si(1), and two equivalent Si(2) atoms. There are seven inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(1), one Ni(3), one Ni(4), one Si(5), and one Si(6) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(2), one Ni(3), one Ni(4), one Ni(5), and one Si(7) atom. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(1), and two equivalent Ni(2) atoms. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(1), and two equivalent Ni(2) atoms. In the fifth Si site, Si(5) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(4), two equivalent Ni(2), and two equivalent Si(1) atoms. In the sixth Si site, Si(6) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(3), two equivalent Ni(2), and two equivalent Si(1) atoms. In the seventh Si site, Si(7) is bonded in a 11-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(3), two equivalent Ni(1), two equivalent Ni(5), and two equivalent Si(2) atoms. is represented by the CIF file [CIF]
data_Sm4Si9Ni7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.945
_cell_length_b   7.945
_cell_length_c   5.660
_cell_angle_alpha   69.385
_cell_angle_beta   69.385
_cell_angle_gamma   91.679
_symmetry_Int_Tables_number   1
_cell_volume   308.138
_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  0.890  0.628  0.487  1.0
  Sm  Sm1  1  0.107  0.366  0.012  1.0
  Sm  Sm2  1  0.372  0.110  0.513  1.0
  Sm  Sm3  1  0.634  0.893  0.988  1.0
  Si  Si4  1  0.239  0.457  0.405  1.0
  Si  Si5  1  0.751  0.529  0.100  1.0
  Si  Si6  1  0.543  0.761  0.595  1.0
  Si  Si7  1  0.471  0.249  0.900  1.0
  Si  Si8  1  0.998  0.002  0.000  1.0
  Si  Si9  1  0.007  0.993  0.500  1.0
  Si  Si10  1  0.267  0.733  0.000  1.0
  Si  Si11  1  0.262  0.738  0.500  1.0
  Si  Si12  1  0.735  0.265  0.500  1.0
  Ni  Ni13  1  0.984  0.238  0.631  1.0
  Ni  Ni14  1  0.021  0.751  0.869  1.0
  Ni  Ni15  1  0.762  0.016  0.369  1.0
  Ni  Ni16  1  0.249  0.979  0.131  1.0
  Ni  Ni17  1  0.496  0.504  0.500  1.0
  Ni  Ni18  1  0.488  0.512  0.000  1.0
  Ni  Ni19  1  0.724  0.276  0.000  1.0
[/CIF]
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The material described by Sm4Ni7Si9 crystallizes in the monoclinic C2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 17-coordinate geometry to one Ni(3), one Ni(4), one Ni(5), two equivalent Ni(1), three equivalent Ni(2), one Si(3), one Si(4), one Si(5), one Si(6), one Si(7), two equivalent Si(1), and two equivalent Si(2) atoms. In the second Sm site, Sm(2) is bonded in a 17-coordinate geometry to one Ni(3), one Ni(4), one Ni(5), two equivalent Ni(2), three equivalent Ni(1), one Si(3), one Si(4), one Si(5), one Si(6), one Si(7), two equivalent Si(1), and two equivalent Si(2) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(5) is bonded in a 11-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(4), two equivalent Ni(1), two equivalent Si(2), and two equivalent Si(7) atoms. In the second Ni site, Ni(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), three equivalent Sm(2), one Ni(5), one Si(1), one Si(3), one Si(4), and one Si(7) atom. In the third Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent Sm(2), three equivalent Sm(1), one Si(2), one Si(3), one Si(4), one Si(5), and one Si(6) atom. In the fourth Ni site, Ni(3) is bonded in a 12-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(4), one Si(6), one Si(7), two equivalent Si(1), and two equivalent Si(2) atoms. In the fifth Ni site, Ni(4) is bonded in a 12-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(5), two equivalent Ni(3), one Si(5), two equivalent Si(1), and two equivalent Si(2) atoms. There are seven inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(1), one Ni(3), one Ni(4), one Si(5), and one Si(6) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(2), one Ni(3), one Ni(4), one Ni(5), and one Si(7) atom. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(1), and two equivalent Ni(2) atoms. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(1), and two equivalent Ni(2) atoms. In the fifth Si site, Si(5) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(4), two equivalent Ni(2), and two equivalent Si(1) atoms. In the sixth Si site, Si(6) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(3), two equivalent Ni(2), and two equivalent Si(1) atoms. In the seventh Si site, Si(7) is bonded in a 11-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Ni(3), two equivalent Ni(1), two equivalent Ni(5), and two equivalent Si(2) atoms. is represented by the CIF file [CIF]
data_Sm4Si9Ni7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.945
_cell_length_b   7.945
_cell_length_c   5.660
_cell_angle_alpha   69.385
_cell_angle_beta   69.385
_cell_angle_gamma   91.679
_symmetry_Int_Tables_number   1
_cell_volume   308.138
_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  0.890  0.628  0.487  1.0
  Sm  Sm1  1  0.107  0.366  0.012  1.0
  Sm  Sm2  1  0.372  0.110  0.513  1.0
  Sm  Sm3  1  0.634  0.893  0.988  1.0
  Si  Si4  1  0.239  0.457  0.405  1.0
  Si  Si5  1  0.751  0.529  0.100  1.0
  Si  Si6  1  0.543  0.761  0.595  1.0
  Si  Si7  1  0.471  0.249  0.900  1.0
  Si  Si8  1  0.998  0.002  0.000  1.0
  Si  Si9  1  0.007  0.993  0.500  1.0
  Si  Si10  1  0.267  0.733  0.000  1.0
  Si  Si11  1  0.262  0.738  0.500  1.0
  Si  Si12  1  0.735  0.265  0.500  1.0
  Ni  Ni13  1  0.984  0.238  0.631  1.0
  Ni  Ni14  1  0.021  0.751  0.869  1.0
  Ni  Ni15  1  0.762  0.016  0.369  1.0
  Ni  Ni16  1  0.249  0.979  0.131  1.0
  Ni  Ni17  1  0.496  0.504  0.500  1.0
  Ni  Ni18  1  0.488  0.512  0.000  1.0
  Ni  Ni19  1  0.724  0.276  0.000  1.0
[/CIF]
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