The structure described by La21Fe8C12Sb7 crystallizes in the cubic Fm-3m space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 3-coordinate geometry to three equivalent C(1), one Sb(2), and three equivalent Sb(1) atoms. In the second La site, La(2) is bonded in a distorted L-shaped geometry to one La(3), two equivalent C(1), and two equivalent Sb(1) atoms. In the third La site, La(3) is bonded to twelve equivalent La(2) atoms to form LaLa12 cuboctahedra that share corners with twenty-four equivalent C(1)La4Fe2 octahedra. The corner-sharing octahedral tilt angles are 45°. Fe(1) is bonded in a trigonal planar geometry to three equivalent C(1) atoms. C(1) is bonded to two equivalent La(1), two equivalent La(2), and two equivalent Fe(1) atoms to form distorted CLa4Fe2 octahedra that share corners with two equivalent La(3)La12 cuboctahedra and edges with five equivalent C(1)La4Fe2 octahedra. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent La(2) atoms. In the second Sb site, Sb(2) is bonded in a body-centered cubic geometry to eight equivalent La(1) atoms. is represented by the CIF card [CIF]
data_La21Fe8Sb7C12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.639
_cell_length_b   11.639
_cell_length_c   11.639
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   1114.868
_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
  La  La0  1  0.867  0.867  0.867  1.0
  La  La1  1  0.500  0.500  0.844  1.0
  La  La2  1  0.399  0.867  0.867  1.0
  La  La3  1  0.844  0.156  0.500  1.0
  La  La4  1  0.156  0.500  0.500  1.0
  La  La5  1  0.156  0.500  0.844  1.0
  La  La6  1  0.500  0.156  0.844  1.0
  La  La7  1  0.500  0.844  0.500  1.0
  La  La8  1  0.844  0.500  0.156  1.0
  La  La9  1  0.500  0.500  0.156  1.0
  La  La10  1  0.133  0.133  0.133  1.0
  La  La11  1  0.133  0.601  0.133  1.0
  La  La12  1  0.500  0.156  0.500  1.0
  La  La13  1  0.500  0.844  0.156  1.0
  La  La14  1  0.156  0.844  0.500  1.0
  La  La15  1  0.133  0.133  0.601  1.0
  La  La16  1  0.500  0.500  0.500  1.0
  La  La17  1  0.867  0.399  0.867  1.0
  La  La18  1  0.601  0.133  0.133  1.0
  La  La19  1  0.867  0.867  0.399  1.0
  La  La20  1  0.844  0.500  0.500  1.0
  Fe  Fe21  1  0.911  0.696  0.696  1.0
  Fe  Fe22  1  0.089  0.304  0.304  1.0
  Fe  Fe23  1  0.696  0.696  0.696  1.0
  Fe  Fe24  1  0.304  0.089  0.304  1.0
  Fe  Fe25  1  0.696  0.911  0.696  1.0
  Fe  Fe26  1  0.696  0.696  0.911  1.0
  Fe  Fe27  1  0.304  0.304  0.089  1.0
  Fe  Fe28  1  0.304  0.304  0.304  1.0
  Sb  Sb29  1  0.775  0.775  0.225  1.0
  Sb  Sb30  1  0.775  0.225  0.225  1.0
  Sb  Sb31  1  0.775  0.225  0.775  1.0
  Sb  Sb32  1  0.225  0.225  0.775  1.0
  Sb  Sb33  1  0.000  0.000  0.000  1.0
  Sb  Sb34  1  0.225  0.775  0.225  1.0
  Sb  Sb35  1  0.225  0.775  0.775  1.0
  C  C36  1  0.390  0.110  0.110  1.0
  C  C37  1  0.110  0.390  0.110  1.0
  C  C38  1  0.610  0.890  0.610  1.0
  C  C39  1  0.390  0.110  0.390  1.0
  C  C40  1  0.610  0.610  0.890  1.0
  C  C41  1  0.110  0.390  0.390  1.0
  C  C42  1  0.890  0.890  0.610  1.0
  C  C43  1  0.890  0.610  0.610  1.0
  C  C44  1  0.110  0.110  0.390  1.0
  C  C45  1  0.890  0.610  0.890  1.0
  C  C46  1  0.610  0.890  0.890  1.0
  C  C47  1  0.390  0.390  0.110  1.0
[/CIF]
.
The structure described by La21Fe8C12Sb7 crystallizes in the cubic Fm-3m space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 3-coordinate geometry to three equivalent C(1), one Sb(2), and three equivalent Sb(1) atoms. In the second La site, La(2) is bonded in a distorted L-shaped geometry to one La(3), two equivalent C(1), and two equivalent Sb(1) atoms. In the third La site, La(3) is bonded to twelve equivalent La(2) atoms to form LaLa12 cuboctahedra that share corners with twenty-four equivalent C(1)La4Fe2 octahedra. The corner-sharing octahedral tilt angles are 45°. Fe(1) is bonded in a trigonal planar geometry to three equivalent C(1) atoms. C(1) is bonded to two equivalent La(1), two equivalent La(2), and two equivalent Fe(1) atoms to form distorted CLa4Fe2 octahedra that share corners with two equivalent La(3)La12 cuboctahedra and edges with five equivalent C(1)La4Fe2 octahedra. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent La(2) atoms. In the second Sb site, Sb(2) is bonded in a body-centered cubic geometry to eight equivalent La(1) atoms. is represented by the CIF card [CIF]
data_La21Fe8Sb7C12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.639
_cell_length_b   11.639
_cell_length_c   11.639
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   1114.868
_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
  La  La0  1  0.867  0.867  0.867  1.0
  La  La1  1  0.500  0.500  0.844  1.0
  La  La2  1  0.399  0.867  0.867  1.0
  La  La3  1  0.844  0.156  0.500  1.0
  La  La4  1  0.156  0.500  0.500  1.0
  La  La5  1  0.156  0.500  0.844  1.0
  La  La6  1  0.500  0.156  0.844  1.0
  La  La7  1  0.500  0.844  0.500  1.0
  La  La8  1  0.844  0.500  0.156  1.0
  La  La9  1  0.500  0.500  0.156  1.0
  La  La10  1  0.133  0.133  0.133  1.0
  La  La11  1  0.133  0.601  0.133  1.0
  La  La12  1  0.500  0.156  0.500  1.0
  La  La13  1  0.500  0.844  0.156  1.0
  La  La14  1  0.156  0.844  0.500  1.0
  La  La15  1  0.133  0.133  0.601  1.0
  La  La16  1  0.500  0.500  0.500  1.0
  La  La17  1  0.867  0.399  0.867  1.0
  La  La18  1  0.601  0.133  0.133  1.0
  La  La19  1  0.867  0.867  0.399  1.0
  La  La20  1  0.844  0.500  0.500  1.0
  Fe  Fe21  1  0.911  0.696  0.696  1.0
  Fe  Fe22  1  0.089  0.304  0.304  1.0
  Fe  Fe23  1  0.696  0.696  0.696  1.0
  Fe  Fe24  1  0.304  0.089  0.304  1.0
  Fe  Fe25  1  0.696  0.911  0.696  1.0
  Fe  Fe26  1  0.696  0.696  0.911  1.0
  Fe  Fe27  1  0.304  0.304  0.089  1.0
  Fe  Fe28  1  0.304  0.304  0.304  1.0
  Sb  Sb29  1  0.775  0.775  0.225  1.0
  Sb  Sb30  1  0.775  0.225  0.225  1.0
  Sb  Sb31  1  0.775  0.225  0.775  1.0
  Sb  Sb32  1  0.225  0.225  0.775  1.0
  Sb  Sb33  1  0.000  0.000  0.000  1.0
  Sb  Sb34  1  0.225  0.775  0.225  1.0
  Sb  Sb35  1  0.225  0.775  0.775  1.0
  C  C36  1  0.390  0.110  0.110  1.0
  C  C37  1  0.110  0.390  0.110  1.0
  C  C38  1  0.610  0.890  0.610  1.0
  C  C39  1  0.390  0.110  0.390  1.0
  C  C40  1  0.610  0.610  0.890  1.0
  C  C41  1  0.110  0.390  0.390  1.0
  C  C42  1  0.890  0.890  0.610  1.0
  C  C43  1  0.890  0.610  0.610  1.0
  C  C44  1  0.110  0.110  0.390  1.0
  C  C45  1  0.890  0.610  0.890  1.0
  C  C46  1  0.610  0.890  0.890  1.0
  C  C47  1  0.390  0.390  0.110  1.0
[/CIF]
.