The material structure described by Sm2Co16Ag crystallizes in the trigonal R3m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 16-coordinate geometry to three equivalent Co(2), three equivalent Co(4), six equivalent Co(1), six equivalent Co(3), and one Ag(1) atom. In the second Sm site, Sm(2) is bonded in a 19-coordinate geometry to one Co(5), three equivalent Co(3), three equivalent Co(4), six equivalent Co(1), and six equivalent Co(2) atoms. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(2), one Co(5), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent Co(4), and one Ag(1) atom. In the second Co site, Co(2) is bonded to one Sm(1), two equivalent Sm(2), one Co(5), two equivalent Co(3), two equivalent Co(4), and four equivalent Co(1) atoms to form CoSm3Co9 cuboctahedra that share corners with two equivalent Co(2)Sm3Co9 cuboctahedra, corners with five equivalent Co(4)Sm2Co9Ag cuboctahedra, corners with eight equivalent Co(3)Sm3Co8Ag cuboctahedra,  an edgeedge with one Co(3)Sm3Co8Ag cuboctahedra, edges with three equivalent Co(4)Sm2Co9Ag cuboctahedra, edges with four equivalent Co(2)Sm3Co9 cuboctahedra, faces with three equivalent Co(4)Sm2Co9Ag cuboctahedra, faces with three equivalent Co(3)Sm3Co8Ag cuboctahedra, and faces with four equivalent Co(2)Sm3Co9 cuboctahedra. In the third Co site, Co(3) is bonded to one Sm(2), two equivalent Sm(1), two equivalent Co(2), two equivalent Co(4), four equivalent Co(1), and one Ag(1) atom to form CoSm3Co8Ag cuboctahedra that share corners with two equivalent Co(3)Sm3Co8Ag cuboctahedra, corners with five equivalent Co(4)Sm2Co9Ag cuboctahedra, corners with eight equivalent Co(2)Sm3Co9 cuboctahedra,  an edgeedge with one Co(2)Sm3Co9 cuboctahedra, edges with three equivalent Co(4)Sm2Co9Ag cuboctahedra, edges with four equivalent Co(3)Sm3Co8Ag cuboctahedra, faces with three equivalent Co(4)Sm2Co9Ag cuboctahedra, faces with three equivalent Co(2)Sm3Co9 cuboctahedra, and faces with four equivalent Co(3)Sm3Co8Ag cuboctahedra. In the fourth Co site, Co(4) is bonded to one Sm(1), one Sm(2), one Co(5), two equivalent Co(2), two equivalent Co(3), four equivalent Co(1), and one Ag(1) atom to form distorted CoSm2Co9Ag cuboctahedra that share corners with four equivalent Co(4)Sm2Co9Ag cuboctahedra, corners with five equivalent Co(3)Sm3Co8Ag cuboctahedra, corners with five equivalent Co(2)Sm3Co9 cuboctahedra, edges with three equivalent Co(3)Sm3Co8Ag cuboctahedra, edges with three equivalent Co(2)Sm3Co9 cuboctahedra, faces with three equivalent Co(3)Sm3Co8Ag cuboctahedra, faces with three equivalent Co(2)Sm3Co9 cuboctahedra, and faces with four equivalent Co(4)Sm2Co9Ag cuboctahedra. In the fifth Co site, Co(5) is bonded in a 14-coordinate geometry to one Sm(2), three equivalent Co(2), three equivalent Co(4), six equivalent Co(1), and one Ag(1) atom. Ag(1) is bonded in a 14-coordinate geometry to one Sm(1), one Co(5), three equivalent Co(3), three equivalent Co(4), and six equivalent Co(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm2Co16Ag
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.359
_cell_length_b   6.359
_cell_length_c   6.359
_cell_angle_alpha   83.568
_cell_angle_beta   83.568
_cell_angle_gamma   83.568
_symmetry_Int_Tables_number   1
_cell_volume   252.674
_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  0.652  0.652  0.652  1.0
  Sm  Sm1  1  0.344  0.344  0.344  1.0
  Co  Co2  1  0.711  0.001  0.290  1.0
  Co  Co3  1  0.001  0.290  0.711  1.0
  Co  Co4  1  0.290  0.711  0.001  1.0
  Co  Co5  1  0.001  0.711  0.290  1.0
  Co  Co6  1  0.711  0.290  0.001  1.0
  Co  Co7  1  0.290  0.001  0.711  1.0
  Co  Co8  1  0.344  0.848  0.344  1.0
  Co  Co9  1  0.848  0.344  0.344  1.0
  Co  Co10  1  0.344  0.344  0.848  1.0
  Co  Co11  1  0.649  0.158  0.649  1.0
  Co  Co12  1  0.158  0.649  0.649  1.0
  Co  Co13  1  0.649  0.649  0.158  1.0
  Co  Co14  1  0.006  0.488  0.006  1.0
  Co  Co15  1  0.488  0.006  0.006  1.0
  Co  Co16  1  0.006  0.006  0.488  1.0
  Co  Co17  1  0.108  0.108  0.108  1.0
  Ag  Ag18  1  0.898  0.898  0.898  1.0
[/CIF]
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The material structure described by Sm2Co16Ag crystallizes in the trigonal R3m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 16-coordinate geometry to three equivalent Co(2), three equivalent Co(4), six equivalent Co(1), six equivalent Co(3), and one Ag(1) atom. In the second Sm site, Sm(2) is bonded in a 19-coordinate geometry to one Co(5), three equivalent Co(3), three equivalent Co(4), six equivalent Co(1), and six equivalent Co(2) atoms. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(2), one Co(5), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent Co(4), and one Ag(1) atom. In the second Co site, Co(2) is bonded to one Sm(1), two equivalent Sm(2), one Co(5), two equivalent Co(3), two equivalent Co(4), and four equivalent Co(1) atoms to form CoSm3Co9 cuboctahedra that share corners with two equivalent Co(2)Sm3Co9 cuboctahedra, corners with five equivalent Co(4)Sm2Co9Ag cuboctahedra, corners with eight equivalent Co(3)Sm3Co8Ag cuboctahedra,  an edgeedge with one Co(3)Sm3Co8Ag cuboctahedra, edges with three equivalent Co(4)Sm2Co9Ag cuboctahedra, edges with four equivalent Co(2)Sm3Co9 cuboctahedra, faces with three equivalent Co(4)Sm2Co9Ag cuboctahedra, faces with three equivalent Co(3)Sm3Co8Ag cuboctahedra, and faces with four equivalent Co(2)Sm3Co9 cuboctahedra. In the third Co site, Co(3) is bonded to one Sm(2), two equivalent Sm(1), two equivalent Co(2), two equivalent Co(4), four equivalent Co(1), and one Ag(1) atom to form CoSm3Co8Ag cuboctahedra that share corners with two equivalent Co(3)Sm3Co8Ag cuboctahedra, corners with five equivalent Co(4)Sm2Co9Ag cuboctahedra, corners with eight equivalent Co(2)Sm3Co9 cuboctahedra,  an edgeedge with one Co(2)Sm3Co9 cuboctahedra, edges with three equivalent Co(4)Sm2Co9Ag cuboctahedra, edges with four equivalent Co(3)Sm3Co8Ag cuboctahedra, faces with three equivalent Co(4)Sm2Co9Ag cuboctahedra, faces with three equivalent Co(2)Sm3Co9 cuboctahedra, and faces with four equivalent Co(3)Sm3Co8Ag cuboctahedra. In the fourth Co site, Co(4) is bonded to one Sm(1), one Sm(2), one Co(5), two equivalent Co(2), two equivalent Co(3), four equivalent Co(1), and one Ag(1) atom to form distorted CoSm2Co9Ag cuboctahedra that share corners with four equivalent Co(4)Sm2Co9Ag cuboctahedra, corners with five equivalent Co(3)Sm3Co8Ag cuboctahedra, corners with five equivalent Co(2)Sm3Co9 cuboctahedra, edges with three equivalent Co(3)Sm3Co8Ag cuboctahedra, edges with three equivalent Co(2)Sm3Co9 cuboctahedra, faces with three equivalent Co(3)Sm3Co8Ag cuboctahedra, faces with three equivalent Co(2)Sm3Co9 cuboctahedra, and faces with four equivalent Co(4)Sm2Co9Ag cuboctahedra. In the fifth Co site, Co(5) is bonded in a 14-coordinate geometry to one Sm(2), three equivalent Co(2), three equivalent Co(4), six equivalent Co(1), and one Ag(1) atom. Ag(1) is bonded in a 14-coordinate geometry to one Sm(1), one Co(5), three equivalent Co(3), three equivalent Co(4), and six equivalent Co(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm2Co16Ag
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.359
_cell_length_b   6.359
_cell_length_c   6.359
_cell_angle_alpha   83.568
_cell_angle_beta   83.568
_cell_angle_gamma   83.568
_symmetry_Int_Tables_number   1
_cell_volume   252.674
_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  0.652  0.652  0.652  1.0
  Sm  Sm1  1  0.344  0.344  0.344  1.0
  Co  Co2  1  0.711  0.001  0.290  1.0
  Co  Co3  1  0.001  0.290  0.711  1.0
  Co  Co4  1  0.290  0.711  0.001  1.0
  Co  Co5  1  0.001  0.711  0.290  1.0
  Co  Co6  1  0.711  0.290  0.001  1.0
  Co  Co7  1  0.290  0.001  0.711  1.0
  Co  Co8  1  0.344  0.848  0.344  1.0
  Co  Co9  1  0.848  0.344  0.344  1.0
  Co  Co10  1  0.344  0.344  0.848  1.0
  Co  Co11  1  0.649  0.158  0.649  1.0
  Co  Co12  1  0.158  0.649  0.649  1.0
  Co  Co13  1  0.649  0.649  0.158  1.0
  Co  Co14  1  0.006  0.488  0.006  1.0
  Co  Co15  1  0.488  0.006  0.006  1.0
  Co  Co16  1  0.006  0.006  0.488  1.0
  Co  Co17  1  0.108  0.108  0.108  1.0
  Ag  Ag18  1  0.898  0.898  0.898  1.0
[/CIF]
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