The material described by HfCrO4 is Hydrophilite-derived structured and crystallizes in the monoclinic P2_1/c space group. Hf(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form HfO6 octahedra that share corners with four equivalent Hf(1)O6 octahedra, corners with six equivalent Cr(1)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. Cr(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with six equivalent Hf(1)O6 octahedra,  an edgeedge with one Hf(1)O6 octahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Hf(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Hf(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Hf(1) and two equivalent Cr(1) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Hf(1) and two equivalent Cr(1) atoms. is represented by the CIF card [CIF]
data_HfCrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.709
_cell_length_b   11.722
_cell_length_c   4.906
_cell_angle_alpha   88.953
_cell_angle_beta   89.998
_cell_angle_gamma   89.996
_symmetry_Int_Tables_number   1
_cell_volume   270.807
_cell_formula_units_Z   4
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
  Hf  Hf0  1  0.995  0.169  0.237  1.0
  Hf  Hf1  1  0.005  0.831  0.763  1.0
  Hf  Hf2  1  0.505  0.669  0.237  1.0
  Hf  Hf3  1  0.495  0.331  0.763  1.0
  Cr  Cr4  1  0.998  0.569  0.741  1.0
  Cr  Cr5  1  0.498  0.931  0.259  1.0
  Cr  Cr6  1  0.002  0.431  0.259  1.0
  Cr  Cr7  1  0.502  0.069  0.741  1.0
  O  O8  1  0.216  0.314  0.412  1.0
  O  O9  1  0.228  0.689  0.912  1.0
  O  O10  1  0.272  0.189  0.912  1.0
  O  O11  1  0.284  0.814  0.412  1.0
  O  O12  1  0.716  0.186  0.588  1.0
  O  O13  1  0.728  0.811  0.088  1.0
  O  O14  1  0.784  0.686  0.588  1.0
  O  O15  1  0.772  0.311  0.088  1.0
  O  O16  1  0.265  0.054  0.435  1.0
  O  O17  1  0.278  0.946  0.928  1.0
  O  O18  1  0.222  0.446  0.928  1.0
  O  O19  1  0.235  0.554  0.435  1.0
  O  O20  1  0.765  0.446  0.564  1.0
  O  O21  1  0.778  0.554  0.072  1.0
  O  O22  1  0.722  0.054  0.072  1.0
  O  O23  1  0.735  0.946  0.565  1.0
[/CIF]
.
The material described by HfCrO4 is Hydrophilite-derived structured and crystallizes in the monoclinic P2_1/c space group. Hf(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form HfO6 octahedra that share corners with four equivalent Hf(1)O6 octahedra, corners with six equivalent Cr(1)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. Cr(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with six equivalent Hf(1)O6 octahedra,  an edgeedge with one Hf(1)O6 octahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Hf(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Hf(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Hf(1) and two equivalent Cr(1) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Hf(1) and two equivalent Cr(1) atoms. is represented by the CIF card [CIF]
data_HfCrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.709
_cell_length_b   11.722
_cell_length_c   4.906
_cell_angle_alpha   88.953
_cell_angle_beta   89.998
_cell_angle_gamma   89.996
_symmetry_Int_Tables_number   1
_cell_volume   270.807
_cell_formula_units_Z   4
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
  Hf  Hf0  1  0.995  0.169  0.237  1.0
  Hf  Hf1  1  0.005  0.831  0.763  1.0
  Hf  Hf2  1  0.505  0.669  0.237  1.0
  Hf  Hf3  1  0.495  0.331  0.763  1.0
  Cr  Cr4  1  0.998  0.569  0.741  1.0
  Cr  Cr5  1  0.498  0.931  0.259  1.0
  Cr  Cr6  1  0.002  0.431  0.259  1.0
  Cr  Cr7  1  0.502  0.069  0.741  1.0
  O  O8  1  0.216  0.314  0.412  1.0
  O  O9  1  0.228  0.689  0.912  1.0
  O  O10  1  0.272  0.189  0.912  1.0
  O  O11  1  0.284  0.814  0.412  1.0
  O  O12  1  0.716  0.186  0.588  1.0
  O  O13  1  0.728  0.811  0.088  1.0
  O  O14  1  0.784  0.686  0.588  1.0
  O  O15  1  0.772  0.311  0.088  1.0
  O  O16  1  0.265  0.054  0.435  1.0
  O  O17  1  0.278  0.946  0.928  1.0
  O  O18  1  0.222  0.446  0.928  1.0
  O  O19  1  0.235  0.554  0.435  1.0
  O  O20  1  0.765  0.446  0.564  1.0
  O  O21  1  0.778  0.554  0.072  1.0
  O  O22  1  0.722  0.054  0.072  1.0
  O  O23  1  0.735  0.946  0.565  1.0
[/CIF]
.