The structure described by KNi2Se2 crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a body-centered cubic geometry to eight equivalent Se(1) atoms. Ni(1) is bonded to four equivalent Se(1) atoms to form a mixture of corner and edge-sharing NiSe4 tetrahedra. Se(1) is bonded in a 8-coordinate geometry to four equivalent K(1) and four equivalent Ni(1) atoms. is represented by the CIF card [CIF]
data_K(NiSe)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.246
_cell_length_b   7.246
_cell_length_c   7.246
_cell_angle_alpha   148.747
_cell_angle_beta   148.747
_cell_angle_gamma   44.784
_symmetry_Int_Tables_number   1
_cell_volume   102.095
_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
  K  K0  1  0.000  0.000  0.000  1.0
  Ni  Ni1  1  0.750  0.250  0.500  1.0
  Ni  Ni2  1  0.250  0.750  0.500  1.0
  Se  Se3  1  0.648  0.648  0.000  1.0
  Se  Se4  1  0.352  0.352  0.000  1.0
[/CIF]
.
The structure described by KNi2Se2 crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a body-centered cubic geometry to eight equivalent Se(1) atoms. Ni(1) is bonded to four equivalent Se(1) atoms to form a mixture of corner and edge-sharing NiSe4 tetrahedra. Se(1) is bonded in a 8-coordinate geometry to four equivalent K(1) and four equivalent Ni(1) atoms. is represented by the CIF card [CIF]
data_K(NiSe)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.246
_cell_length_b   7.246
_cell_length_c   7.246
_cell_angle_alpha   148.747
_cell_angle_beta   148.747
_cell_angle_gamma   44.784
_symmetry_Int_Tables_number   1
_cell_volume   102.095
_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
  K  K0  1  0.000  0.000  0.000  1.0
  Ni  Ni1  1  0.750  0.250  0.500  1.0
  Ni  Ni2  1  0.250  0.750  0.500  1.0
  Se  Se3  1  0.648  0.648  0.000  1.0
  Se  Se4  1  0.352  0.352  0.000  1.0
[/CIF]
.