The material structure described by YFe2O4 is Aluminum carbonitride-like structured and crystallizes in the monoclinic C2/m space group. Y(1) is bonded to three equivalent O(3) and three equivalent O(4) atoms to form distorted YO6 octahedra that share corners with three equivalent Fe(1)O5 trigonal bipyramids, corners with three equivalent Fe(2)O5 trigonal bipyramids, and edges with six equivalent Y(1)O6 octahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(1)O6 octahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids, corners with four equivalent Fe(2)O5 trigonal bipyramids,  an edgeedge with one Fe(1)O5 trigonal bipyramid, and edges with two equivalent Fe(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 63°. In the second Fe site, Fe(2) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(1)O6 octahedra, corners with two equivalent Fe(2)O5 trigonal bipyramids, corners with four equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(2)O5 trigonal bipyramid, and edges with two equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 59-63°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Fe(1) and two equivalent Fe(2) atoms to form OFe4 trigonal pyramids that share corners with two equivalent O(3)Y3Fe tetrahedra, corners with two equivalent O(4)Y3Fe tetrahedra, corners with two equivalent O(1)Fe4 trigonal pyramids, corners with four equivalent O(2)Fe4 trigonal pyramids,  an edgeedge with one O(1)Fe4 trigonal pyramid, and edges with two equivalent O(2)Fe4 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Fe(1) and two equivalent Fe(2) atoms to form OFe4 trigonal pyramids that share corners with two equivalent O(3)Y3Fe tetrahedra, corners with two equivalent O(4)Y3Fe tetrahedra, corners with two equivalent O(2)Fe4 trigonal pyramids, corners with four equivalent O(1)Fe4 trigonal pyramids,  an edgeedge with one O(2)Fe4 trigonal pyramid, and edges with two equivalent O(1)Fe4 trigonal pyramids. In the third O site, O(3) is bonded to three equivalent Y(1) and one Fe(1) atom to form OY3Fe tetrahedra that share corners with two equivalent O(3)Y3Fe tetrahedra, corners with seven equivalent O(4)Y3Fe tetrahedra, corners with two equivalent O(1)Fe4 trigonal pyramids, corners with two equivalent O(2)Fe4 trigonal pyramids,  an edgeedge with one O(4)Y3Fe tetrahedra, and edges with two equivalent O(3)Y3Fe tetrahedra. In the fourth O site, O(4) is bonded to three equivalent Y(1) and one Fe(2) atom to form OY3Fe tetrahedra that share corners with two equivalent O(4)Y3Fe tetrahedra, corners with seven equivalent O(3)Y3Fe tetrahedra, corners with two equivalent O(1)Fe4 trigonal pyramids, corners with two equivalent O(2)Fe4 trigonal pyramids,  an edgeedge with one O(3)Y3Fe tetrahedra, and edges with two equivalent O(4)Y3Fe tetrahedra. is represented by the CIF file [CIF]
data_Y(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.509
_cell_length_b   3.535
_cell_length_c   8.725
_cell_angle_alpha   79.288
_cell_angle_beta   78.403
_cell_angle_gamma   60.251
_symmetry_Int_Tables_number   1
_cell_volume   91.557
_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
  Fe  Fe0  1  0.790  0.781  0.640  1.0
  Fe  Fe1  1  0.211  0.219  0.360  1.0
  O  O2  1  0.873  0.868  0.386  1.0
  O  O3  1  0.127  0.132  0.614  1.0
  O  O4  1  0.712  0.701  0.875  1.0
  O  O5  1  0.288  0.299  0.125  1.0
  Y  Y6  1  1.000  0.000  0.000  1.0
[/CIF]
.
The material structure described by YFe2O4 is Aluminum carbonitride-like structured and crystallizes in the monoclinic C2/m space group. Y(1) is bonded to three equivalent O(3) and three equivalent O(4) atoms to form distorted YO6 octahedra that share corners with three equivalent Fe(1)O5 trigonal bipyramids, corners with three equivalent Fe(2)O5 trigonal bipyramids, and edges with six equivalent Y(1)O6 octahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(1)O6 octahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids, corners with four equivalent Fe(2)O5 trigonal bipyramids,  an edgeedge with one Fe(1)O5 trigonal bipyramid, and edges with two equivalent Fe(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 63°. In the second Fe site, Fe(2) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form FeO5 trigonal bipyramids that share corners with three equivalent Y(1)O6 octahedra, corners with two equivalent Fe(2)O5 trigonal bipyramids, corners with four equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(2)O5 trigonal bipyramid, and edges with two equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 59-63°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Fe(1) and two equivalent Fe(2) atoms to form OFe4 trigonal pyramids that share corners with two equivalent O(3)Y3Fe tetrahedra, corners with two equivalent O(4)Y3Fe tetrahedra, corners with two equivalent O(1)Fe4 trigonal pyramids, corners with four equivalent O(2)Fe4 trigonal pyramids,  an edgeedge with one O(1)Fe4 trigonal pyramid, and edges with two equivalent O(2)Fe4 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Fe(1) and two equivalent Fe(2) atoms to form OFe4 trigonal pyramids that share corners with two equivalent O(3)Y3Fe tetrahedra, corners with two equivalent O(4)Y3Fe tetrahedra, corners with two equivalent O(2)Fe4 trigonal pyramids, corners with four equivalent O(1)Fe4 trigonal pyramids,  an edgeedge with one O(2)Fe4 trigonal pyramid, and edges with two equivalent O(1)Fe4 trigonal pyramids. In the third O site, O(3) is bonded to three equivalent Y(1) and one Fe(1) atom to form OY3Fe tetrahedra that share corners with two equivalent O(3)Y3Fe tetrahedra, corners with seven equivalent O(4)Y3Fe tetrahedra, corners with two equivalent O(1)Fe4 trigonal pyramids, corners with two equivalent O(2)Fe4 trigonal pyramids,  an edgeedge with one O(4)Y3Fe tetrahedra, and edges with two equivalent O(3)Y3Fe tetrahedra. In the fourth O site, O(4) is bonded to three equivalent Y(1) and one Fe(2) atom to form OY3Fe tetrahedra that share corners with two equivalent O(4)Y3Fe tetrahedra, corners with seven equivalent O(3)Y3Fe tetrahedra, corners with two equivalent O(1)Fe4 trigonal pyramids, corners with two equivalent O(2)Fe4 trigonal pyramids,  an edgeedge with one O(3)Y3Fe tetrahedra, and edges with two equivalent O(4)Y3Fe tetrahedra. is represented by the CIF file [CIF]
data_Y(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.509
_cell_length_b   3.535
_cell_length_c   8.725
_cell_angle_alpha   79.288
_cell_angle_beta   78.403
_cell_angle_gamma   60.251
_symmetry_Int_Tables_number   1
_cell_volume   91.557
_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
  Fe  Fe0  1  0.790  0.781  0.640  1.0
  Fe  Fe1  1  0.211  0.219  0.360  1.0
  O  O2  1  0.873  0.868  0.386  1.0
  O  O3  1  0.127  0.132  0.614  1.0
  O  O4  1  0.712  0.701  0.875  1.0
  O  O5  1  0.288  0.299  0.125  1.0
  Y  Y6  1  1.000  0.000  0.000  1.0
[/CIF]
.