The material structure described by YFe2O4 is Aluminum carbonitride-like structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to three equivalent O(2) and three equivalent O(6) atoms to form distorted YO6 octahedra that share corners with three equivalent Fe(1)O5 trigonal bipyramids, corners with three equivalent Fe(3)O5 trigonal bipyramids, and edges with six equivalent Y(1)O6 octahedra. In the second Y site, Y(2) is bonded to six equivalent O(3) atoms to form distorted YO6 octahedra that share corners with six equivalent Fe(2)O5 trigonal bipyramids and edges with six equivalent Y(2)O6 octahedra. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(6) and four equivalent O(5) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(1)O6 octahedra, corners with six equivalent Fe(1)O5 trigonal bipyramids, and edges with three equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-63°. In the second Fe site, Fe(2) is bonded to one O(3), one O(4), and three equivalent O(1) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(2)O6 octahedra, corners with six equivalent Fe(2)O5 trigonal bipyramids, and edges with three equivalent Fe(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-64°. In the third Fe site, Fe(3) is bonded to one O(1), one O(2), and three equivalent O(4) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(1)O6 octahedra, corners with six equivalent Fe(3)O5 trigonal bipyramids, and edges with three equivalent Fe(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 63°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Fe(3) and three equivalent Fe(2) atoms to form OFe4 trigonal pyramids that share  a cornercorner with one O(2)Y3Fe tetrahedra, corners with three equivalent O(3)Y3Fe tetrahedra, corners with six equivalent O(1)Fe4 trigonal pyramids, and edges with three equivalent O(4)Fe4 trigonal pyramids. In the second O site, O(2) is bonded to three equivalent Y(1) and one Fe(3) atom to form OY3Fe tetrahedra that share corners with three equivalent O(6)Y3Fe tetrahedra, corners with six equivalent O(2)Y3Fe tetrahedra,  a cornercorner with one O(1)Fe4 trigonal pyramid, corners with three equivalent O(4)Fe4 trigonal pyramids, and edges with three equivalent O(6)Y3Fe tetrahedra. In the third O site, O(3) is bonded to three equivalent Y(2) and one Fe(2) atom to form OY3Fe tetrahedra that share corners with nine equivalent O(3)Y3Fe tetrahedra,  a cornercorner with one O(4)Fe4 trigonal pyramid, corners with three equivalent O(1)Fe4 trigonal pyramids, and edges with three equivalent O(3)Y3Fe tetrahedra. In the fourth O site, O(4) is bonded to one Fe(2) and three equivalent Fe(3) atoms to form OFe4 trigonal pyramids that share  a cornercorner with one O(3)Y3Fe tetrahedra, corners with three equivalent O(2)Y3Fe tetrahedra, corners with six equivalent O(4)Fe4 trigonal pyramids, and edges with three equivalent O(1)Fe4 trigonal pyramids. In the fifth O site, O(5) is bonded to four equivalent Fe(1) atoms to form OFe4 trigonal pyramids that share corners with four equivalent O(6)Y3Fe tetrahedra, corners with six equivalent O(5)Fe4 trigonal pyramids, and edges with three equivalent O(5)Fe4 trigonal pyramids. In the sixth O site, O(6) is bonded to three equivalent Y(1) and one Fe(1) atom to form OY3Fe tetrahedra that share corners with three equivalent O(2)Y3Fe tetrahedra, corners with six equivalent O(6)Y3Fe tetrahedra, corners with four equivalent O(5)Fe4 trigonal pyramids, and edges with three equivalent O(2)Y3Fe tetrahedra. is represented by the CIF card [CIF]
data_Y(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.544
_cell_length_b   3.544
_cell_length_c   25.201
_cell_angle_alpha   89.874
_cell_angle_beta   89.874
_cell_angle_gamma   59.832
_symmetry_Int_Tables_number   1
_cell_volume   273.679
_cell_formula_units_Z   3
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  0.327  0.327  0.666  1.0
  Y  Y1  1  0.000  0.000  0.000  1.0
  Y  Y2  1  0.673  0.673  0.334  1.0
  Fe  Fe3  1  0.334  0.334  0.454  1.0
  Fe  Fe4  1  0.672  0.672  0.121  1.0
  Fe  Fe5  1  0.328  0.328  0.879  1.0
  Fe  Fe6  1  0.009  0.009  0.213  1.0
  Fe  Fe7  1  0.991  0.991  0.787  1.0
  Fe  Fe8  1  0.666  0.666  0.546  1.0
  O  O9  1  0.992  0.992  0.871  1.0
  O  O10  1  0.007  0.007  0.292  1.0
  O  O11  1  0.333  0.333  0.958  1.0
  O  O12  1  0.327  0.327  0.795  1.0
  O  O13  1  0.670  0.670  0.462  1.0
  O  O14  1  0.330  0.330  0.538  1.0
  O  O15  1  0.673  0.673  0.205  1.0
  O  O16  1  0.993  0.993  0.708  1.0
  O  O17  1  0.667  0.667  0.042  1.0
  O  O18  1  0.008  0.008  0.129  1.0
  O  O19  1  0.661  0.661  0.625  1.0
  O  O20  1  0.339  0.339  0.375  1.0
[/CIF]
.
The material structure described by YFe2O4 is Aluminum carbonitride-like structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to three equivalent O(2) and three equivalent O(6) atoms to form distorted YO6 octahedra that share corners with three equivalent Fe(1)O5 trigonal bipyramids, corners with three equivalent Fe(3)O5 trigonal bipyramids, and edges with six equivalent Y(1)O6 octahedra. In the second Y site, Y(2) is bonded to six equivalent O(3) atoms to form distorted YO6 octahedra that share corners with six equivalent Fe(2)O5 trigonal bipyramids and edges with six equivalent Y(2)O6 octahedra. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(6) and four equivalent O(5) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(1)O6 octahedra, corners with six equivalent Fe(1)O5 trigonal bipyramids, and edges with three equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-63°. In the second Fe site, Fe(2) is bonded to one O(3), one O(4), and three equivalent O(1) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(2)O6 octahedra, corners with six equivalent Fe(2)O5 trigonal bipyramids, and edges with three equivalent Fe(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-64°. In the third Fe site, Fe(3) is bonded to one O(1), one O(2), and three equivalent O(4) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(1)O6 octahedra, corners with six equivalent Fe(3)O5 trigonal bipyramids, and edges with three equivalent Fe(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 63°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Fe(3) and three equivalent Fe(2) atoms to form OFe4 trigonal pyramids that share  a cornercorner with one O(2)Y3Fe tetrahedra, corners with three equivalent O(3)Y3Fe tetrahedra, corners with six equivalent O(1)Fe4 trigonal pyramids, and edges with three equivalent O(4)Fe4 trigonal pyramids. In the second O site, O(2) is bonded to three equivalent Y(1) and one Fe(3) atom to form OY3Fe tetrahedra that share corners with three equivalent O(6)Y3Fe tetrahedra, corners with six equivalent O(2)Y3Fe tetrahedra,  a cornercorner with one O(1)Fe4 trigonal pyramid, corners with three equivalent O(4)Fe4 trigonal pyramids, and edges with three equivalent O(6)Y3Fe tetrahedra. In the third O site, O(3) is bonded to three equivalent Y(2) and one Fe(2) atom to form OY3Fe tetrahedra that share corners with nine equivalent O(3)Y3Fe tetrahedra,  a cornercorner with one O(4)Fe4 trigonal pyramid, corners with three equivalent O(1)Fe4 trigonal pyramids, and edges with three equivalent O(3)Y3Fe tetrahedra. In the fourth O site, O(4) is bonded to one Fe(2) and three equivalent Fe(3) atoms to form OFe4 trigonal pyramids that share  a cornercorner with one O(3)Y3Fe tetrahedra, corners with three equivalent O(2)Y3Fe tetrahedra, corners with six equivalent O(4)Fe4 trigonal pyramids, and edges with three equivalent O(1)Fe4 trigonal pyramids. In the fifth O site, O(5) is bonded to four equivalent Fe(1) atoms to form OFe4 trigonal pyramids that share corners with four equivalent O(6)Y3Fe tetrahedra, corners with six equivalent O(5)Fe4 trigonal pyramids, and edges with three equivalent O(5)Fe4 trigonal pyramids. In the sixth O site, O(6) is bonded to three equivalent Y(1) and one Fe(1) atom to form OY3Fe tetrahedra that share corners with three equivalent O(2)Y3Fe tetrahedra, corners with six equivalent O(6)Y3Fe tetrahedra, corners with four equivalent O(5)Fe4 trigonal pyramids, and edges with three equivalent O(2)Y3Fe tetrahedra. is represented by the CIF card [CIF]
data_Y(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.544
_cell_length_b   3.544
_cell_length_c   25.201
_cell_angle_alpha   89.874
_cell_angle_beta   89.874
_cell_angle_gamma   59.832
_symmetry_Int_Tables_number   1
_cell_volume   273.679
_cell_formula_units_Z   3
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  0.327  0.327  0.666  1.0
  Y  Y1  1  0.000  0.000  0.000  1.0
  Y  Y2  1  0.673  0.673  0.334  1.0
  Fe  Fe3  1  0.334  0.334  0.454  1.0
  Fe  Fe4  1  0.672  0.672  0.121  1.0
  Fe  Fe5  1  0.328  0.328  0.879  1.0
  Fe  Fe6  1  0.009  0.009  0.213  1.0
  Fe  Fe7  1  0.991  0.991  0.787  1.0
  Fe  Fe8  1  0.666  0.666  0.546  1.0
  O  O9  1  0.992  0.992  0.871  1.0
  O  O10  1  0.007  0.007  0.292  1.0
  O  O11  1  0.333  0.333  0.958  1.0
  O  O12  1  0.327  0.327  0.795  1.0
  O  O13  1  0.670  0.670  0.462  1.0
  O  O14  1  0.330  0.330  0.538  1.0
  O  O15  1  0.673  0.673  0.205  1.0
  O  O16  1  0.993  0.993  0.708  1.0
  O  O17  1  0.667  0.667  0.042  1.0
  O  O18  1  0.008  0.008  0.129  1.0
  O  O19  1  0.661  0.661  0.625  1.0
  O  O20  1  0.339  0.339  0.375  1.0
[/CIF]
.