The crystal structure described by K3Na(CrO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 1-coordinate geometry to one O(1) atom. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Na(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form NaO6 octahedra that share corners with six equivalent Cr(1)O4 tetrahedra. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-24°. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 1-coordinate geometry to one K(2), one Na(1), and one Cr(1) atom. In the second O site, O(4) is bonded in a 2-coordinate geometry to one K(2), one Na(1), and one Cr(1) atom. In the third O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one K(2), and one Cr(1) atom. In the fourth O site, O(2) is bonded in a 2-coordinate geometry to one K(2), one Na(1), and one Cr(1) atom. is represented by the CIF file [CIF]
data_K3NaCr2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.965
_cell_length_b   5.979
_cell_length_c   7.604
_cell_angle_alpha   89.784
_cell_angle_beta   90.000
_cell_angle_gamma   119.926
_symmetry_Int_Tables_number   1
_cell_volume   235.055
_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
  Cr  Cr0  1  0.665  0.331  0.272  1.0
  Cr  Cr1  1  0.335  0.669  0.728  1.0
  K  K2  1  0.667  0.334  0.829  1.0
  K  K3  1  0.333  0.666  0.171  1.0
  K  K4  1  0.000  0.000  0.500  1.0
  Na  Na5  1  0.000  0.000  0.000  1.0
  O  O6  1  0.667  0.334  0.488  1.0
  O  O7  1  0.333  0.666  0.512  1.0
  O  O8  1  0.362  0.179  0.197  1.0
  O  O9  1  0.183  0.821  0.803  1.0
  O  O10  1  0.638  0.821  0.803  1.0
  O  O11  1  0.817  0.179  0.197  1.0
  O  O12  1  0.817  0.633  0.194  1.0
  O  O13  1  0.183  0.367  0.806  1.0
[/CIF]
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The crystal structure described by K3Na(CrO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 1-coordinate geometry to one O(1) atom. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Na(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form NaO6 octahedra that share corners with six equivalent Cr(1)O4 tetrahedra. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-24°. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 1-coordinate geometry to one K(2), one Na(1), and one Cr(1) atom. In the second O site, O(4) is bonded in a 2-coordinate geometry to one K(2), one Na(1), and one Cr(1) atom. In the third O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one K(2), and one Cr(1) atom. In the fourth O site, O(2) is bonded in a 2-coordinate geometry to one K(2), one Na(1), and one Cr(1) atom. is represented by the CIF file [CIF]
data_K3NaCr2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.965
_cell_length_b   5.979
_cell_length_c   7.604
_cell_angle_alpha   89.784
_cell_angle_beta   90.000
_cell_angle_gamma   119.926
_symmetry_Int_Tables_number   1
_cell_volume   235.055
_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
  Cr  Cr0  1  0.665  0.331  0.272  1.0
  Cr  Cr1  1  0.335  0.669  0.728  1.0
  K  K2  1  0.667  0.334  0.829  1.0
  K  K3  1  0.333  0.666  0.171  1.0
  K  K4  1  0.000  0.000  0.500  1.0
  Na  Na5  1  0.000  0.000  0.000  1.0
  O  O6  1  0.667  0.334  0.488  1.0
  O  O7  1  0.333  0.666  0.512  1.0
  O  O8  1  0.362  0.179  0.197  1.0
  O  O9  1  0.183  0.821  0.803  1.0
  O  O10  1  0.638  0.821  0.803  1.0
  O  O11  1  0.817  0.179  0.197  1.0
  O  O12  1  0.817  0.633  0.194  1.0
  O  O13  1  0.183  0.367  0.806  1.0
[/CIF]
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