The material structure described by Sm2Co17 crystallizes in the trigonal R-3m space group. Sm(1) is bonded in a 19-coordinate geometry to one Co(1), three equivalent Co(2), six equivalent Co(3), and nine equivalent Co(4) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Sm(1), one Co(1), three equivalent Co(2), three equivalent Co(4), and six equivalent Co(3) atoms. In the second Co site, Co(2) is bonded to two equivalent Sm(1), two equivalent Co(1), four equivalent Co(3), and four equivalent Co(4) atoms to form CoSm2Co10 cuboctahedra that share corners with four equivalent Co(2)Sm2Co10 cuboctahedra, corners with ten equivalent Co(4)Sm3Co9 cuboctahedra, edges with six equivalent Co(4)Sm3Co9 cuboctahedra, faces with four equivalent Co(2)Sm2Co10 cuboctahedra, and faces with six equivalent Co(4)Sm3Co9 cuboctahedra. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to two equivalent Sm(1), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), and four equivalent Co(4) atoms. In the fourth Co site, Co(4) is bonded to three equivalent Sm(1), one Co(1), two equivalent Co(2), two equivalent Co(4), and four equivalent Co(3) atoms to form CoSm3Co9 cuboctahedra that share corners with five equivalent Co(2)Sm2Co10 cuboctahedra, corners with ten equivalent Co(4)Sm3Co9 cuboctahedra, edges with three equivalent Co(2)Sm2Co10 cuboctahedra, edges with five equivalent Co(4)Sm3Co9 cuboctahedra, faces with three equivalent Co(2)Sm2Co10 cuboctahedra, and faces with seven equivalent Co(4)Sm3Co9 cuboctahedra. is represented by the CIF file [CIF]
data_Sm2Co17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.316
_cell_length_b   6.316
_cell_length_c   6.316
_cell_angle_alpha   82.969
_cell_angle_beta   82.969
_cell_angle_gamma   82.969
_symmetry_Int_Tables_number   1
_cell_volume   246.741
_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  0.656  0.656  0.656  1.0
  Sm  Sm1  1  0.344  0.344  0.344  1.0
  Co  Co2  1  0.904  0.904  0.904  1.0
  Co  Co3  1  0.096  0.096  0.096  1.0
  Co  Co4  1  0.000  0.000  0.500  1.0
  Co  Co5  1  0.000  0.500  0.000  1.0
  Co  Co6  1  0.500  0.000  0.000  1.0
  Co  Co7  1  0.286  0.714  0.000  1.0
  Co  Co8  1  0.714  0.000  0.286  1.0
  Co  Co9  1  0.000  0.286  0.714  1.0
  Co  Co10  1  0.286  0.000  0.714  1.0
  Co  Co11  1  0.000  0.714  0.286  1.0
  Co  Co12  1  0.714  0.286  0.000  1.0
  Co  Co13  1  0.850  0.344  0.344  1.0
  Co  Co14  1  0.344  0.344  0.850  1.0
  Co  Co15  1  0.344  0.850  0.344  1.0
  Co  Co16  1  0.150  0.656  0.656  1.0
  Co  Co17  1  0.656  0.656  0.150  1.0
  Co  Co18  1  0.656  0.150  0.656  1.0
[/CIF]
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The material structure described by Sm2Co17 crystallizes in the trigonal R-3m space group. Sm(1) is bonded in a 19-coordinate geometry to one Co(1), three equivalent Co(2), six equivalent Co(3), and nine equivalent Co(4) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Sm(1), one Co(1), three equivalent Co(2), three equivalent Co(4), and six equivalent Co(3) atoms. In the second Co site, Co(2) is bonded to two equivalent Sm(1), two equivalent Co(1), four equivalent Co(3), and four equivalent Co(4) atoms to form CoSm2Co10 cuboctahedra that share corners with four equivalent Co(2)Sm2Co10 cuboctahedra, corners with ten equivalent Co(4)Sm3Co9 cuboctahedra, edges with six equivalent Co(4)Sm3Co9 cuboctahedra, faces with four equivalent Co(2)Sm2Co10 cuboctahedra, and faces with six equivalent Co(4)Sm3Co9 cuboctahedra. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to two equivalent Sm(1), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), and four equivalent Co(4) atoms. In the fourth Co site, Co(4) is bonded to three equivalent Sm(1), one Co(1), two equivalent Co(2), two equivalent Co(4), and four equivalent Co(3) atoms to form CoSm3Co9 cuboctahedra that share corners with five equivalent Co(2)Sm2Co10 cuboctahedra, corners with ten equivalent Co(4)Sm3Co9 cuboctahedra, edges with three equivalent Co(2)Sm2Co10 cuboctahedra, edges with five equivalent Co(4)Sm3Co9 cuboctahedra, faces with three equivalent Co(2)Sm2Co10 cuboctahedra, and faces with seven equivalent Co(4)Sm3Co9 cuboctahedra. is represented by the CIF file [CIF]
data_Sm2Co17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.316
_cell_length_b   6.316
_cell_length_c   6.316
_cell_angle_alpha   82.969
_cell_angle_beta   82.969
_cell_angle_gamma   82.969
_symmetry_Int_Tables_number   1
_cell_volume   246.741
_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  0.656  0.656  0.656  1.0
  Sm  Sm1  1  0.344  0.344  0.344  1.0
  Co  Co2  1  0.904  0.904  0.904  1.0
  Co  Co3  1  0.096  0.096  0.096  1.0
  Co  Co4  1  0.000  0.000  0.500  1.0
  Co  Co5  1  0.000  0.500  0.000  1.0
  Co  Co6  1  0.500  0.000  0.000  1.0
  Co  Co7  1  0.286  0.714  0.000  1.0
  Co  Co8  1  0.714  0.000  0.286  1.0
  Co  Co9  1  0.000  0.286  0.714  1.0
  Co  Co10  1  0.286  0.000  0.714  1.0
  Co  Co11  1  0.000  0.714  0.286  1.0
  Co  Co12  1  0.714  0.286  0.000  1.0
  Co  Co13  1  0.850  0.344  0.344  1.0
  Co  Co14  1  0.344  0.344  0.850  1.0
  Co  Co15  1  0.344  0.850  0.344  1.0
  Co  Co16  1  0.150  0.656  0.656  1.0
  Co  Co17  1  0.656  0.656  0.150  1.0
  Co  Co18  1  0.656  0.150  0.656  1.0
[/CIF]
.