The material described by K2SrBe2F8 crystallizes in the trigonal R-3m space group. K(1) is bonded in a 10-coordinate geometry to one F(2) and nine equivalent F(1) atoms. Sr(1) is bonded in a 6-coordinate geometry to six equivalent F(1) atoms. Be(1) is bonded in a tetrahedral geometry to one F(2) and three equivalent F(1) atoms. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to three equivalent K(1), one Sr(1), and one Be(1) atom. In the second F site, F(2) is bonded in a distorted single-bond geometry to one K(1) and one Be(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2SrBe2F8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.607
_cell_length_b   7.607
_cell_length_c   7.607
_cell_angle_alpha   42.337
_cell_angle_beta   42.337
_cell_angle_gamma   42.337
_symmetry_Int_Tables_number   1
_cell_volume   180.762
_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  0.202  0.202  0.202  1.0
  K  K1  1  0.798  0.798  0.798  1.0
  Sr  Sr2  1  0.000  0.000  0.000  1.0
  Be  Be3  1  0.599  0.599  0.599  1.0
  Be  Be4  1  0.401  0.401  0.401  1.0
  F  F5  1  0.731  0.262  0.731  1.0
  F  F6  1  0.262  0.731  0.731  1.0
  F  F7  1  0.731  0.731  0.262  1.0
  F  F8  1  0.327  0.327  0.327  1.0
  F  F9  1  0.673  0.673  0.673  1.0
  F  F10  1  0.738  0.269  0.269  1.0
  F  F11  1  0.269  0.269  0.738  1.0
  F  F12  1  0.269  0.738  0.269  1.0
[/CIF]
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The material described by K2SrBe2F8 crystallizes in the trigonal R-3m space group. K(1) is bonded in a 10-coordinate geometry to one F(2) and nine equivalent F(1) atoms. Sr(1) is bonded in a 6-coordinate geometry to six equivalent F(1) atoms. Be(1) is bonded in a tetrahedral geometry to one F(2) and three equivalent F(1) atoms. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to three equivalent K(1), one Sr(1), and one Be(1) atom. In the second F site, F(2) is bonded in a distorted single-bond geometry to one K(1) and one Be(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2SrBe2F8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.607
_cell_length_b   7.607
_cell_length_c   7.607
_cell_angle_alpha   42.337
_cell_angle_beta   42.337
_cell_angle_gamma   42.337
_symmetry_Int_Tables_number   1
_cell_volume   180.762
_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  0.202  0.202  0.202  1.0
  K  K1  1  0.798  0.798  0.798  1.0
  Sr  Sr2  1  0.000  0.000  0.000  1.0
  Be  Be3  1  0.599  0.599  0.599  1.0
  Be  Be4  1  0.401  0.401  0.401  1.0
  F  F5  1  0.731  0.262  0.731  1.0
  F  F6  1  0.262  0.731  0.731  1.0
  F  F7  1  0.731  0.731  0.262  1.0
  F  F8  1  0.327  0.327  0.327  1.0
  F  F9  1  0.673  0.673  0.673  1.0
  F  F10  1  0.738  0.269  0.269  1.0
  F  F11  1  0.269  0.269  0.738  1.0
  F  F12  1  0.269  0.738  0.269  1.0
[/CIF]
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