The material structure described by KEr3F10 crystallizes in the orthorhombic Immm space group. K(1) is bonded in a distorted tetrahedral geometry to two equivalent F(4) and two equivalent F(5) atoms. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to one F(2), one F(3), two equivalent F(1), two equivalent F(4), and two equivalent F(5) atoms. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to two equivalent F(4), two equivalent F(5), and four equivalent F(1) atoms. There are five inequivalent F sites. In the first F site, F(1) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(2) atom. In the second F site, F(2) is bonded in a bent 150 degrees geometry to two equivalent Er(1) atoms. In the third F site, F(3) is bonded in a bent 150 degrees geometry to two equivalent Er(1) atoms. In the fourth F site, F(4) is bonded to one K(1), one Er(2), and two equivalent Er(1) atoms to form a mixture of edge and corner-sharing FKEr3 tetrahedra. In the fifth F site, F(5) is bonded to one K(1), one Er(2), and two equivalent Er(1) atoms to form a mixture of edge and corner-sharing FKEr3 tetrahedra. is represented by the CIF file [CIF]
data_KEr3F10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.047
_cell_length_b   8.049
_cell_length_c   8.049
_cell_angle_alpha   60.013
_cell_angle_beta   60.007
_cell_angle_gamma   60.006
_symmetry_Int_Tables_number   1
_cell_volume   368.702
_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  0.750  0.750  0.750  1.0
  K  K1  1  0.250  0.250  0.250  1.0
  Er  Er2  1  0.240  0.760  0.240  1.0
  Er  Er3  1  0.760  0.240  0.240  1.0
  Er  Er4  1  0.240  0.760  0.760  1.0
  Er  Er5  1  0.240  0.240  0.760  1.0
  Er  Er6  1  0.760  0.240  0.760  1.0
  Er  Er7  1  0.760  0.760  0.240  1.0
  F  F8  1  0.832  0.169  0.500  1.0
  F  F9  1  0.500  0.169  0.831  1.0
  F  F10  1  0.832  0.500  0.169  1.0
  F  F11  1  0.500  0.169  0.500  1.0
  F  F12  1  0.832  0.500  0.500  1.0
  F  F13  1  0.168  0.500  0.831  1.0
  F  F14  1  0.500  0.831  0.500  1.0
  F  F15  1  0.500  0.500  0.169  1.0
  F  F16  1  0.888  0.336  0.888  1.0
  F  F17  1  0.112  0.112  0.664  1.0
  F  F18  1  0.664  0.112  0.112  1.0
  F  F19  1  0.112  0.112  0.112  1.0
  F  F20  1  0.336  0.888  0.888  1.0
  F  F21  1  0.888  0.888  0.888  1.0
  F  F22  1  0.888  0.888  0.336  1.0
  F  F23  1  0.112  0.664  0.112  1.0
  F  F24  1  0.168  0.831  0.500  1.0
  F  F25  1  0.500  0.831  0.169  1.0
  F  F26  1  0.168  0.500  0.500  1.0
  F  F27  1  0.500  0.500  0.831  1.0
[/CIF]
.
The material structure described by KEr3F10 crystallizes in the orthorhombic Immm space group. K(1) is bonded in a distorted tetrahedral geometry to two equivalent F(4) and two equivalent F(5) atoms. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to one F(2), one F(3), two equivalent F(1), two equivalent F(4), and two equivalent F(5) atoms. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to two equivalent F(4), two equivalent F(5), and four equivalent F(1) atoms. There are five inequivalent F sites. In the first F site, F(1) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(2) atom. In the second F site, F(2) is bonded in a bent 150 degrees geometry to two equivalent Er(1) atoms. In the third F site, F(3) is bonded in a bent 150 degrees geometry to two equivalent Er(1) atoms. In the fourth F site, F(4) is bonded to one K(1), one Er(2), and two equivalent Er(1) atoms to form a mixture of edge and corner-sharing FKEr3 tetrahedra. In the fifth F site, F(5) is bonded to one K(1), one Er(2), and two equivalent Er(1) atoms to form a mixture of edge and corner-sharing FKEr3 tetrahedra. is represented by the CIF file [CIF]
data_KEr3F10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.047
_cell_length_b   8.049
_cell_length_c   8.049
_cell_angle_alpha   60.013
_cell_angle_beta   60.007
_cell_angle_gamma   60.006
_symmetry_Int_Tables_number   1
_cell_volume   368.702
_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  0.750  0.750  0.750  1.0
  K  K1  1  0.250  0.250  0.250  1.0
  Er  Er2  1  0.240  0.760  0.240  1.0
  Er  Er3  1  0.760  0.240  0.240  1.0
  Er  Er4  1  0.240  0.760  0.760  1.0
  Er  Er5  1  0.240  0.240  0.760  1.0
  Er  Er6  1  0.760  0.240  0.760  1.0
  Er  Er7  1  0.760  0.760  0.240  1.0
  F  F8  1  0.832  0.169  0.500  1.0
  F  F9  1  0.500  0.169  0.831  1.0
  F  F10  1  0.832  0.500  0.169  1.0
  F  F11  1  0.500  0.169  0.500  1.0
  F  F12  1  0.832  0.500  0.500  1.0
  F  F13  1  0.168  0.500  0.831  1.0
  F  F14  1  0.500  0.831  0.500  1.0
  F  F15  1  0.500  0.500  0.169  1.0
  F  F16  1  0.888  0.336  0.888  1.0
  F  F17  1  0.112  0.112  0.664  1.0
  F  F18  1  0.664  0.112  0.112  1.0
  F  F19  1  0.112  0.112  0.112  1.0
  F  F20  1  0.336  0.888  0.888  1.0
  F  F21  1  0.888  0.888  0.888  1.0
  F  F22  1  0.888  0.888  0.336  1.0
  F  F23  1  0.112  0.664  0.112  1.0
  F  F24  1  0.168  0.831  0.500  1.0
  F  F25  1  0.500  0.831  0.169  1.0
  F  F26  1  0.168  0.500  0.500  1.0
  F  F27  1  0.500  0.500  0.831  1.0
[/CIF]
.