The material described by Y2Fe15Cr2 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 20-coordinate geometry to two equivalent Cr(1), six equivalent Fe(1), six equivalent Fe(2), and six equivalent Fe(3) atoms. In the second Y site, Y(2) is bonded in a 18-coordinate geometry to six equivalent Fe(2) and twelve equivalent Fe(1) atoms. Cr(1) is bonded in a 14-coordinate geometry to one Y(1), one Cr(1), three equivalent Fe(1), three equivalent Fe(3), and six equivalent Fe(2) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(3) is bonded to two equivalent Y(1), two equivalent Cr(1), four equivalent Fe(1), and four equivalent Fe(2) atoms to form FeY2Cr2Fe8 cuboctahedra that share corners with four equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, corners with eight equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, corners with ten equivalent Fe(1)Y3CrFe8 cuboctahedra, edges with four equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, edges with six equivalent Fe(1)Y3CrFe8 cuboctahedra, faces with four equivalent Fe(1)Y3CrFe8 cuboctahedra, faces with six equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, and faces with eight equivalent Fe(2)Y2Cr2Fe8 cuboctahedra. In the second Fe site, Fe(1) is bonded to one Y(1), two equivalent Y(2), one Cr(1), two equivalent Fe(1), two equivalent Fe(3), and four equivalent Fe(2) atoms to form distorted FeY3CrFe8 cuboctahedra that share corners with five equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, corners with eight equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, corners with ten equivalent Fe(1)Y3CrFe8 cuboctahedra, edges with two equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, edges with three equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, edges with five equivalent Fe(1)Y3CrFe8 cuboctahedra, faces with two equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, faces with eight equivalent Fe(1)Y3CrFe8 cuboctahedra, and faces with ten equivalent Fe(2)Y2Cr2Fe8 cuboctahedra. In the third Fe site, Fe(2) is bonded to one Y(1), one Y(2), two equivalent Cr(1), two equivalent Fe(2), two equivalent Fe(3), and four equivalent Fe(1) atoms to form distorted FeY2Cr2Fe8 cuboctahedra that share corners with four equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, corners with eight equivalent Fe(1)Y3CrFe8 cuboctahedra, corners with twelve equivalent Fe(2)Y2Cr2Fe8 cuboctahedra,  an edgeedge with one Fe(2)Y2Cr2Fe8 cuboctahedra, edges with two equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, edges with two equivalent Fe(1)Y3CrFe8 cuboctahedra, faces with four equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, faces with seven equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, and faces with ten equivalent Fe(1)Y3CrFe8 cuboctahedra. is represented by the CIF card [CIF]
data_Y2Cr2Fe15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.386
_cell_length_b   8.386
_cell_length_c   8.298
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   505.382
_cell_formula_units_Z   2
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
  Y  Y0  1  0.333  0.667  0.250  1.0
  Y  Y1  1  0.667  0.333  0.750  1.0
  Y  Y2  1  0.000  0.000  0.250  1.0
  Y  Y3  1  0.000  0.000  0.750  1.0
  Cr  Cr4  1  0.333  0.667  0.619  1.0
  Cr  Cr5  1  0.667  0.333  0.381  1.0
  Cr  Cr6  1  0.667  0.333  0.119  1.0
  Cr  Cr7  1  0.333  0.667  0.881  1.0
  Fe  Fe8  1  0.167  0.333  0.012  1.0
  Fe  Fe9  1  0.833  0.667  0.988  1.0
  Fe  Fe10  1  0.667  0.833  0.012  1.0
  Fe  Fe11  1  0.833  0.667  0.512  1.0
  Fe  Fe12  1  0.333  0.167  0.988  1.0
  Fe  Fe13  1  0.167  0.333  0.488  1.0
  Fe  Fe14  1  0.167  0.833  0.012  1.0
  Fe  Fe15  1  0.333  0.167  0.512  1.0
  Fe  Fe16  1  0.833  0.167  0.988  1.0
  Fe  Fe17  1  0.667  0.833  0.488  1.0
  Fe  Fe18  1  0.833  0.167  0.512  1.0
  Fe  Fe19  1  0.167  0.833  0.488  1.0
  Fe  Fe20  1  0.960  0.330  0.250  1.0
  Fe  Fe21  1  0.040  0.670  0.750  1.0
  Fe  Fe22  1  0.670  0.630  0.250  1.0
  Fe  Fe23  1  0.330  0.960  0.750  1.0
  Fe  Fe24  1  0.330  0.370  0.750  1.0
  Fe  Fe25  1  0.670  0.040  0.250  1.0
  Fe  Fe26  1  0.370  0.040  0.250  1.0
  Fe  Fe27  1  0.630  0.670  0.750  1.0
  Fe  Fe28  1  0.630  0.960  0.750  1.0
  Fe  Fe29  1  0.370  0.330  0.250  1.0
  Fe  Fe30  1  0.040  0.370  0.750  1.0
  Fe  Fe31  1  0.960  0.630  0.250  1.0
  Fe  Fe32  1  0.500  0.000  0.000  1.0
  Fe  Fe33  1  0.000  0.500  0.000  1.0
  Fe  Fe34  1  0.500  0.000  0.500  1.0
  Fe  Fe35  1  0.500  0.500  0.000  1.0
  Fe  Fe36  1  0.000  0.500  0.500  1.0
  Fe  Fe37  1  0.500  0.500  0.500  1.0
[/CIF]
.
The material described by Y2Fe15Cr2 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 20-coordinate geometry to two equivalent Cr(1), six equivalent Fe(1), six equivalent Fe(2), and six equivalent Fe(3) atoms. In the second Y site, Y(2) is bonded in a 18-coordinate geometry to six equivalent Fe(2) and twelve equivalent Fe(1) atoms. Cr(1) is bonded in a 14-coordinate geometry to one Y(1), one Cr(1), three equivalent Fe(1), three equivalent Fe(3), and six equivalent Fe(2) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(3) is bonded to two equivalent Y(1), two equivalent Cr(1), four equivalent Fe(1), and four equivalent Fe(2) atoms to form FeY2Cr2Fe8 cuboctahedra that share corners with four equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, corners with eight equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, corners with ten equivalent Fe(1)Y3CrFe8 cuboctahedra, edges with four equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, edges with six equivalent Fe(1)Y3CrFe8 cuboctahedra, faces with four equivalent Fe(1)Y3CrFe8 cuboctahedra, faces with six equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, and faces with eight equivalent Fe(2)Y2Cr2Fe8 cuboctahedra. In the second Fe site, Fe(1) is bonded to one Y(1), two equivalent Y(2), one Cr(1), two equivalent Fe(1), two equivalent Fe(3), and four equivalent Fe(2) atoms to form distorted FeY3CrFe8 cuboctahedra that share corners with five equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, corners with eight equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, corners with ten equivalent Fe(1)Y3CrFe8 cuboctahedra, edges with two equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, edges with three equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, edges with five equivalent Fe(1)Y3CrFe8 cuboctahedra, faces with two equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, faces with eight equivalent Fe(1)Y3CrFe8 cuboctahedra, and faces with ten equivalent Fe(2)Y2Cr2Fe8 cuboctahedra. In the third Fe site, Fe(2) is bonded to one Y(1), one Y(2), two equivalent Cr(1), two equivalent Fe(2), two equivalent Fe(3), and four equivalent Fe(1) atoms to form distorted FeY2Cr2Fe8 cuboctahedra that share corners with four equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, corners with eight equivalent Fe(1)Y3CrFe8 cuboctahedra, corners with twelve equivalent Fe(2)Y2Cr2Fe8 cuboctahedra,  an edgeedge with one Fe(2)Y2Cr2Fe8 cuboctahedra, edges with two equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, edges with two equivalent Fe(1)Y3CrFe8 cuboctahedra, faces with four equivalent Fe(3)Y2Cr2Fe8 cuboctahedra, faces with seven equivalent Fe(2)Y2Cr2Fe8 cuboctahedra, and faces with ten equivalent Fe(1)Y3CrFe8 cuboctahedra. is represented by the CIF card [CIF]
data_Y2Cr2Fe15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.386
_cell_length_b   8.386
_cell_length_c   8.298
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   505.382
_cell_formula_units_Z   2
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
  Y  Y0  1  0.333  0.667  0.250  1.0
  Y  Y1  1  0.667  0.333  0.750  1.0
  Y  Y2  1  0.000  0.000  0.250  1.0
  Y  Y3  1  0.000  0.000  0.750  1.0
  Cr  Cr4  1  0.333  0.667  0.619  1.0
  Cr  Cr5  1  0.667  0.333  0.381  1.0
  Cr  Cr6  1  0.667  0.333  0.119  1.0
  Cr  Cr7  1  0.333  0.667  0.881  1.0
  Fe  Fe8  1  0.167  0.333  0.012  1.0
  Fe  Fe9  1  0.833  0.667  0.988  1.0
  Fe  Fe10  1  0.667  0.833  0.012  1.0
  Fe  Fe11  1  0.833  0.667  0.512  1.0
  Fe  Fe12  1  0.333  0.167  0.988  1.0
  Fe  Fe13  1  0.167  0.333  0.488  1.0
  Fe  Fe14  1  0.167  0.833  0.012  1.0
  Fe  Fe15  1  0.333  0.167  0.512  1.0
  Fe  Fe16  1  0.833  0.167  0.988  1.0
  Fe  Fe17  1  0.667  0.833  0.488  1.0
  Fe  Fe18  1  0.833  0.167  0.512  1.0
  Fe  Fe19  1  0.167  0.833  0.488  1.0
  Fe  Fe20  1  0.960  0.330  0.250  1.0
  Fe  Fe21  1  0.040  0.670  0.750  1.0
  Fe  Fe22  1  0.670  0.630  0.250  1.0
  Fe  Fe23  1  0.330  0.960  0.750  1.0
  Fe  Fe24  1  0.330  0.370  0.750  1.0
  Fe  Fe25  1  0.670  0.040  0.250  1.0
  Fe  Fe26  1  0.370  0.040  0.250  1.0
  Fe  Fe27  1  0.630  0.670  0.750  1.0
  Fe  Fe28  1  0.630  0.960  0.750  1.0
  Fe  Fe29  1  0.370  0.330  0.250  1.0
  Fe  Fe30  1  0.040  0.370  0.750  1.0
  Fe  Fe31  1  0.960  0.630  0.250  1.0
  Fe  Fe32  1  0.500  0.000  0.000  1.0
  Fe  Fe33  1  0.000  0.500  0.000  1.0
  Fe  Fe34  1  0.500  0.000  0.500  1.0
  Fe  Fe35  1  0.500  0.500  0.000  1.0
  Fe  Fe36  1  0.000  0.500  0.500  1.0
  Fe  Fe37  1  0.500  0.500  0.500  1.0
[/CIF]
.