The compound described by La21Fe8Sn7C12 crystallizes in the cubic Fm-3m space group. There are three inequivalent La sites. In the first La site, La(1) is bonded to three equivalent Sn(1) and three equivalent C(1) atoms to form distorted LaSn3C3 octahedra that share corners with six equivalent La(1)Sn3C3 octahedra, edges with three equivalent La(1)Sn3C3 octahedra, and  a faceface with one La(3)Sn6 octahedra. The corner-sharing octahedral tilt angles range from 18-43°. In the second La site, La(2) is bonded in a distorted L-shaped geometry to one Sn(2), two equivalent Sn(1), and two equivalent C(1) atoms. In the third La site, La(3) is bonded to six equivalent Sn(1) atoms to form face-sharing LaSn6 octahedra. Fe(1) is bonded in a trigonal planar geometry to three equivalent C(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one La(3), four equivalent La(1), and four equivalent La(2) atoms. In the second Sn site, Sn(2) is bonded to twelve equivalent La(2) atoms to form SnLa12 cuboctahedra that share corners with twenty-four equivalent C(1)La4Fe2 octahedra. The corner-sharing octahedral tilt angles are 44°. 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 Sn(2)La12 cuboctahedra and edges with five equivalent C(1)La4Fe2 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_La21Fe8Sn7C12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.644
_cell_length_b   11.644
_cell_length_c   11.644
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   1116.202
_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  0.094  0.635  0.635  1.0
  La  La1  1  0.365  0.365  0.365  1.0
  La  La2  1  0.635  0.635  0.635  1.0
  La  La3  1  0.000  0.340  0.660  1.0
  La  La4  1  0.000  0.340  0.000  1.0
  La  La5  1  0.340  0.000  0.000  1.0
  La  La6  1  0.660  0.000  0.340  1.0
  La  La7  1  0.365  0.906  0.365  1.0
  La  La8  1  0.635  0.635  0.094  1.0
  La  La9  1  0.660  0.340  0.000  1.0
  La  La10  1  0.340  0.000  0.660  1.0
  La  La11  1  0.340  0.660  0.000  1.0
  La  La12  1  0.000  0.000  0.660  1.0
  La  La13  1  0.635  0.094  0.635  1.0
  La  La14  1  0.000  0.000  0.340  1.0
  La  La15  1  0.660  0.000  0.000  1.0
  La  La16  1  0.500  0.500  0.500  1.0
  La  La17  1  0.000  0.660  0.340  1.0
  La  La18  1  0.906  0.365  0.365  1.0
  La  La19  1  0.000  0.660  0.000  1.0
  La  La20  1  0.365  0.365  0.906  1.0
  Fe  Fe21  1  0.412  0.196  0.196  1.0
  Fe  Fe22  1  0.588  0.804  0.804  1.0
  Fe  Fe23  1  0.804  0.804  0.804  1.0
  Fe  Fe24  1  0.804  0.588  0.804  1.0
  Fe  Fe25  1  0.196  0.196  0.412  1.0
  Fe  Fe26  1  0.196  0.412  0.196  1.0
  Fe  Fe27  1  0.196  0.196  0.196  1.0
  Fe  Fe28  1  0.804  0.804  0.588  1.0
  Sn  Sn29  1  0.289  0.711  0.289  1.0
  Sn  Sn30  1  0.289  0.711  0.711  1.0
  Sn  Sn31  1  0.711  0.289  0.711  1.0
  Sn  Sn32  1  0.711  0.289  0.289  1.0
  Sn  Sn33  1  0.000  0.000  0.000  1.0
  Sn  Sn34  1  0.289  0.289  0.711  1.0
  Sn  Sn35  1  0.711  0.711  0.289  1.0
  C  C36  1  0.890  0.610  0.610  1.0
  C  C37  1  0.390  0.110  0.110  1.0
  C  C38  1  0.610  0.890  0.610  1.0
  C  C39  1  0.110  0.110  0.390  1.0
  C  C40  1  0.890  0.890  0.610  1.0
  C  C41  1  0.390  0.110  0.390  1.0
  C  C42  1  0.110  0.390  0.110  1.0
  C  C43  1  0.610  0.610  0.890  1.0
  C  C44  1  0.890  0.610  0.890  1.0
  C  C45  1  0.610  0.890  0.890  1.0
  C  C46  1  0.390  0.390  0.110  1.0
  C  C47  1  0.110  0.390  0.390  1.0
[/CIF]
.
The compound described by La21Fe8Sn7C12 crystallizes in the cubic Fm-3m space group. There are three inequivalent La sites. In the first La site, La(1) is bonded to three equivalent Sn(1) and three equivalent C(1) atoms to form distorted LaSn3C3 octahedra that share corners with six equivalent La(1)Sn3C3 octahedra, edges with three equivalent La(1)Sn3C3 octahedra, and  a faceface with one La(3)Sn6 octahedra. The corner-sharing octahedral tilt angles range from 18-43°. In the second La site, La(2) is bonded in a distorted L-shaped geometry to one Sn(2), two equivalent Sn(1), and two equivalent C(1) atoms. In the third La site, La(3) is bonded to six equivalent Sn(1) atoms to form face-sharing LaSn6 octahedra. Fe(1) is bonded in a trigonal planar geometry to three equivalent C(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one La(3), four equivalent La(1), and four equivalent La(2) atoms. In the second Sn site, Sn(2) is bonded to twelve equivalent La(2) atoms to form SnLa12 cuboctahedra that share corners with twenty-four equivalent C(1)La4Fe2 octahedra. The corner-sharing octahedral tilt angles are 44°. 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 Sn(2)La12 cuboctahedra and edges with five equivalent C(1)La4Fe2 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_La21Fe8Sn7C12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.644
_cell_length_b   11.644
_cell_length_c   11.644
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   1116.202
_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  0.094  0.635  0.635  1.0
  La  La1  1  0.365  0.365  0.365  1.0
  La  La2  1  0.635  0.635  0.635  1.0
  La  La3  1  0.000  0.340  0.660  1.0
  La  La4  1  0.000  0.340  0.000  1.0
  La  La5  1  0.340  0.000  0.000  1.0
  La  La6  1  0.660  0.000  0.340  1.0
  La  La7  1  0.365  0.906  0.365  1.0
  La  La8  1  0.635  0.635  0.094  1.0
  La  La9  1  0.660  0.340  0.000  1.0
  La  La10  1  0.340  0.000  0.660  1.0
  La  La11  1  0.340  0.660  0.000  1.0
  La  La12  1  0.000  0.000  0.660  1.0
  La  La13  1  0.635  0.094  0.635  1.0
  La  La14  1  0.000  0.000  0.340  1.0
  La  La15  1  0.660  0.000  0.000  1.0
  La  La16  1  0.500  0.500  0.500  1.0
  La  La17  1  0.000  0.660  0.340  1.0
  La  La18  1  0.906  0.365  0.365  1.0
  La  La19  1  0.000  0.660  0.000  1.0
  La  La20  1  0.365  0.365  0.906  1.0
  Fe  Fe21  1  0.412  0.196  0.196  1.0
  Fe  Fe22  1  0.588  0.804  0.804  1.0
  Fe  Fe23  1  0.804  0.804  0.804  1.0
  Fe  Fe24  1  0.804  0.588  0.804  1.0
  Fe  Fe25  1  0.196  0.196  0.412  1.0
  Fe  Fe26  1  0.196  0.412  0.196  1.0
  Fe  Fe27  1  0.196  0.196  0.196  1.0
  Fe  Fe28  1  0.804  0.804  0.588  1.0
  Sn  Sn29  1  0.289  0.711  0.289  1.0
  Sn  Sn30  1  0.289  0.711  0.711  1.0
  Sn  Sn31  1  0.711  0.289  0.711  1.0
  Sn  Sn32  1  0.711  0.289  0.289  1.0
  Sn  Sn33  1  0.000  0.000  0.000  1.0
  Sn  Sn34  1  0.289  0.289  0.711  1.0
  Sn  Sn35  1  0.711  0.711  0.289  1.0
  C  C36  1  0.890  0.610  0.610  1.0
  C  C37  1  0.390  0.110  0.110  1.0
  C  C38  1  0.610  0.890  0.610  1.0
  C  C39  1  0.110  0.110  0.390  1.0
  C  C40  1  0.890  0.890  0.610  1.0
  C  C41  1  0.390  0.110  0.390  1.0
  C  C42  1  0.110  0.390  0.110  1.0
  C  C43  1  0.610  0.610  0.890  1.0
  C  C44  1  0.890  0.610  0.890  1.0
  C  C45  1  0.610  0.890  0.890  1.0
  C  C46  1  0.390  0.390  0.110  1.0
  C  C47  1  0.110  0.390  0.390  1.0
[/CIF]
.