The structure described by K2ErF5 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 8-coordinate geometry to two equivalent F(1), two equivalent F(2), two equivalent F(3), and two equivalent F(4) atoms. Er(1) is bonded to one F(1), one F(2), one F(4), and four equivalent F(3) atoms to form distorted edge-sharing ErF7 pentagonal bipyramids. There are four inequivalent F sites. In the first F site, F(1) is bonded in a 5-coordinate geometry to four equivalent K(1) and one Er(1) atom. In the second F site, F(2) is bonded to four equivalent K(1) and one Er(1) atom to form a mixture of distorted corner, edge, and face-sharing FK4Er trigonal bipyramids. In the third F site, F(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Er(1) atoms. In the fourth F site, F(4) is bonded to four equivalent K(1) and one Er(1) atom to form a mixture of distorted corner, edge, and face-sharing FK4Er trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2ErF5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.523
_cell_length_b   7.158
_cell_length_c   10.683
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   498.745
_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
  K  K0  1  0.537  0.997  0.829  1.0
  K  K1  1  0.463  0.497  0.171  1.0
  K  K2  1  0.963  0.997  0.329  1.0
  K  K3  1  0.037  0.497  0.671  1.0
  K  K4  1  0.537  0.503  0.829  1.0
  K  K5  1  0.463  0.003  0.171  1.0
  K  K6  1  0.963  0.503  0.329  1.0
  K  K7  1  0.037  0.003  0.671  1.0
  Er  Er8  1  0.565  0.250  0.503  1.0
  Er  Er9  1  0.435  0.750  0.497  1.0
  Er  Er10  1  0.935  0.250  0.003  1.0
  Er  Er11  1  0.065  0.750  0.997  1.0
  F  F12  1  0.873  0.750  0.832  1.0
  F  F13  1  0.127  0.250  0.168  1.0
  F  F14  1  0.627  0.750  0.332  1.0
  F  F15  1  0.373  0.250  0.668  1.0
  F  F16  1  0.840  0.250  0.808  1.0
  F  F17  1  0.160  0.750  0.192  1.0
  F  F18  1  0.660  0.250  0.308  1.0
  F  F19  1  0.340  0.750  0.692  1.0
  F  F20  1  0.649  0.964  0.574  1.0
  F  F21  1  0.351  0.464  0.426  1.0
  F  F22  1  0.851  0.964  0.074  1.0
  F  F23  1  0.149  0.464  0.926  1.0
  F  F24  1  0.395  0.750  0.987  1.0
  F  F25  1  0.605  0.250  0.013  1.0
  F  F26  1  0.105  0.750  0.487  1.0
  F  F27  1  0.895  0.250  0.513  1.0
  F  F28  1  0.149  0.036  0.926  1.0
  F  F29  1  0.851  0.536  0.074  1.0
  F  F30  1  0.351  0.036  0.426  1.0
  F  F31  1  0.649  0.536  0.574  1.0
[/CIF]
.
The structure described by K2ErF5 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 8-coordinate geometry to two equivalent F(1), two equivalent F(2), two equivalent F(3), and two equivalent F(4) atoms. Er(1) is bonded to one F(1), one F(2), one F(4), and four equivalent F(3) atoms to form distorted edge-sharing ErF7 pentagonal bipyramids. There are four inequivalent F sites. In the first F site, F(1) is bonded in a 5-coordinate geometry to four equivalent K(1) and one Er(1) atom. In the second F site, F(2) is bonded to four equivalent K(1) and one Er(1) atom to form a mixture of distorted corner, edge, and face-sharing FK4Er trigonal bipyramids. In the third F site, F(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Er(1) atoms. In the fourth F site, F(4) is bonded to four equivalent K(1) and one Er(1) atom to form a mixture of distorted corner, edge, and face-sharing FK4Er trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2ErF5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.523
_cell_length_b   7.158
_cell_length_c   10.683
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   498.745
_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
  K  K0  1  0.537  0.997  0.829  1.0
  K  K1  1  0.463  0.497  0.171  1.0
  K  K2  1  0.963  0.997  0.329  1.0
  K  K3  1  0.037  0.497  0.671  1.0
  K  K4  1  0.537  0.503  0.829  1.0
  K  K5  1  0.463  0.003  0.171  1.0
  K  K6  1  0.963  0.503  0.329  1.0
  K  K7  1  0.037  0.003  0.671  1.0
  Er  Er8  1  0.565  0.250  0.503  1.0
  Er  Er9  1  0.435  0.750  0.497  1.0
  Er  Er10  1  0.935  0.250  0.003  1.0
  Er  Er11  1  0.065  0.750  0.997  1.0
  F  F12  1  0.873  0.750  0.832  1.0
  F  F13  1  0.127  0.250  0.168  1.0
  F  F14  1  0.627  0.750  0.332  1.0
  F  F15  1  0.373  0.250  0.668  1.0
  F  F16  1  0.840  0.250  0.808  1.0
  F  F17  1  0.160  0.750  0.192  1.0
  F  F18  1  0.660  0.250  0.308  1.0
  F  F19  1  0.340  0.750  0.692  1.0
  F  F20  1  0.649  0.964  0.574  1.0
  F  F21  1  0.351  0.464  0.426  1.0
  F  F22  1  0.851  0.964  0.074  1.0
  F  F23  1  0.149  0.464  0.926  1.0
  F  F24  1  0.395  0.750  0.987  1.0
  F  F25  1  0.605  0.250  0.013  1.0
  F  F26  1  0.105  0.750  0.487  1.0
  F  F27  1  0.895  0.250  0.513  1.0
  F  F28  1  0.149  0.036  0.926  1.0
  F  F29  1  0.851  0.536  0.074  1.0
  F  F30  1  0.351  0.036  0.426  1.0
  F  F31  1  0.649  0.536  0.574  1.0
[/CIF]
.