The crystal structure described by K2Cr2O5 crystallizes in the orthorhombic Ima2 space group. K(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(2), and four equivalent O(1) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. In the second Cr site, Cr(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form corner-sharing CrO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and two equivalent Cr(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent K(1), one Cr(1), and one Cr(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Cr(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Cr2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.294
_cell_length_b   8.294
_cell_length_c   8.294
_cell_angle_alpha   138.223
_cell_angle_beta   135.620
_cell_angle_gamma   62.583
_symmetry_Int_Tables_number   1
_cell_volume   262.586
_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
  K  K0  1  0.914  0.363  0.513  1.0
  K  K1  1  0.086  0.599  0.450  1.0
  K  K2  1  0.350  0.863  0.450  1.0
  K  K3  1  0.650  0.099  0.513  1.0
  Cr  Cr4  1  0.000  0.952  0.952  1.0
  Cr  Cr5  1  0.500  0.452  0.952  1.0
  Cr  Cr6  1  0.660  0.741  0.900  1.0
  Cr  Cr7  1  0.340  0.241  0.081  1.0
  O  O8  1  0.290  0.285  0.548  1.0
  O  O9  1  0.710  0.259  0.995  1.0
  O  O10  1  0.236  0.785  0.995  1.0
  O  O11  1  0.764  0.759  0.548  1.0
  O  O12  1  0.907  0.868  0.058  1.0
  O  O13  1  0.093  0.151  0.962  1.0
  O  O14  1  0.311  0.368  0.962  1.0
  O  O15  1  0.689  0.651  0.058  1.0
  O  O16  1  0.554  0.446  0.500  1.0
  O  O17  1  0.446  0.946  0.892  1.0
[/CIF]
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The crystal structure described by K2Cr2O5 crystallizes in the orthorhombic Ima2 space group. K(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(2), and four equivalent O(1) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. In the second Cr site, Cr(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form corner-sharing CrO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and two equivalent Cr(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent K(1), one Cr(1), and one Cr(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Cr(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Cr2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.294
_cell_length_b   8.294
_cell_length_c   8.294
_cell_angle_alpha   138.223
_cell_angle_beta   135.620
_cell_angle_gamma   62.583
_symmetry_Int_Tables_number   1
_cell_volume   262.586
_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
  K  K0  1  0.914  0.363  0.513  1.0
  K  K1  1  0.086  0.599  0.450  1.0
  K  K2  1  0.350  0.863  0.450  1.0
  K  K3  1  0.650  0.099  0.513  1.0
  Cr  Cr4  1  0.000  0.952  0.952  1.0
  Cr  Cr5  1  0.500  0.452  0.952  1.0
  Cr  Cr6  1  0.660  0.741  0.900  1.0
  Cr  Cr7  1  0.340  0.241  0.081  1.0
  O  O8  1  0.290  0.285  0.548  1.0
  O  O9  1  0.710  0.259  0.995  1.0
  O  O10  1  0.236  0.785  0.995  1.0
  O  O11  1  0.764  0.759  0.548  1.0
  O  O12  1  0.907  0.868  0.058  1.0
  O  O13  1  0.093  0.151  0.962  1.0
  O  O14  1  0.311  0.368  0.962  1.0
  O  O15  1  0.689  0.651  0.058  1.0
  O  O16  1  0.554  0.446  0.500  1.0
  O  O17  1  0.446  0.946  0.892  1.0
[/CIF]
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