The crystal structure described by Na2LiBe2F7 crystallizes in the tetragonal P-42_1m space group. Na(1) is bonded in a 8-coordinate geometry to one F(2), three equivalent F(3), and four equivalent F(1) atoms. Li(1) is bonded to four equivalent F(1) atoms to form LiF4 tetrahedra that share corners with four equivalent Be(1)F4 tetrahedra. Be(1) is bonded to one F(2), one F(3), and two equivalent F(1) atoms to form BeF4 tetrahedra that share  a cornercorner with one Be(1)F4 tetrahedra and corners with two equivalent Li(1)F4 tetrahedra. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Li(1), and one Be(1) atom. In the second F site, F(2) is bonded in a 4-coordinate geometry to two equivalent Na(1) and two equivalent Be(1) atoms. In the third F site, F(3) is bonded in a distorted single-bond geometry to three equivalent Na(1) and one Be(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2LiBe2F7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.699
_cell_length_b   7.699
_cell_length_c   4.896
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   290.201
_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
  Na  Na0  1  0.832  0.668  0.495  1.0
  Na  Na1  1  0.332  0.832  0.505  1.0
  Na  Na2  1  0.668  0.168  0.505  1.0
  Na  Na3  1  0.168  0.332  0.495  1.0
  Li  Li4  1  0.500  0.500  0.000  1.0
  Li  Li5  1  0.000  0.000  0.000  1.0
  Be  Be6  1  0.860  0.360  0.929  1.0
  Be  Be7  1  0.360  0.140  0.071  1.0
  Be  Be8  1  0.140  0.640  0.929  1.0
  Be  Be9  1  0.640  0.860  0.071  1.0
  F  F10  1  0.583  0.686  0.207  1.0
  F  F11  1  0.417  0.314  0.207  1.0
  F  F12  1  0.314  0.583  0.793  1.0
  F  F13  1  0.686  0.417  0.793  1.0
  F  F14  1  0.000  0.500  0.819  1.0
  F  F15  1  0.500  0.000  0.181  1.0
  F  F16  1  0.358  0.142  0.759  1.0
  F  F17  1  0.858  0.358  0.241  1.0
  F  F18  1  0.142  0.642  0.241  1.0
  F  F19  1  0.642  0.858  0.759  1.0
  F  F20  1  0.083  0.814  0.793  1.0
  F  F21  1  0.186  0.083  0.207  1.0
  F  F22  1  0.814  0.917  0.207  1.0
  F  F23  1  0.917  0.186  0.793  1.0
[/CIF]
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The crystal structure described by Na2LiBe2F7 crystallizes in the tetragonal P-42_1m space group. Na(1) is bonded in a 8-coordinate geometry to one F(2), three equivalent F(3), and four equivalent F(1) atoms. Li(1) is bonded to four equivalent F(1) atoms to form LiF4 tetrahedra that share corners with four equivalent Be(1)F4 tetrahedra. Be(1) is bonded to one F(2), one F(3), and two equivalent F(1) atoms to form BeF4 tetrahedra that share  a cornercorner with one Be(1)F4 tetrahedra and corners with two equivalent Li(1)F4 tetrahedra. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Li(1), and one Be(1) atom. In the second F site, F(2) is bonded in a 4-coordinate geometry to two equivalent Na(1) and two equivalent Be(1) atoms. In the third F site, F(3) is bonded in a distorted single-bond geometry to three equivalent Na(1) and one Be(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2LiBe2F7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.699
_cell_length_b   7.699
_cell_length_c   4.896
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   290.201
_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
  Na  Na0  1  0.832  0.668  0.495  1.0
  Na  Na1  1  0.332  0.832  0.505  1.0
  Na  Na2  1  0.668  0.168  0.505  1.0
  Na  Na3  1  0.168  0.332  0.495  1.0
  Li  Li4  1  0.500  0.500  0.000  1.0
  Li  Li5  1  0.000  0.000  0.000  1.0
  Be  Be6  1  0.860  0.360  0.929  1.0
  Be  Be7  1  0.360  0.140  0.071  1.0
  Be  Be8  1  0.140  0.640  0.929  1.0
  Be  Be9  1  0.640  0.860  0.071  1.0
  F  F10  1  0.583  0.686  0.207  1.0
  F  F11  1  0.417  0.314  0.207  1.0
  F  F12  1  0.314  0.583  0.793  1.0
  F  F13  1  0.686  0.417  0.793  1.0
  F  F14  1  0.000  0.500  0.819  1.0
  F  F15  1  0.500  0.000  0.181  1.0
  F  F16  1  0.358  0.142  0.759  1.0
  F  F17  1  0.858  0.358  0.241  1.0
  F  F18  1  0.142  0.642  0.241  1.0
  F  F19  1  0.642  0.858  0.759  1.0
  F  F20  1  0.083  0.814  0.793  1.0
  F  F21  1  0.186  0.083  0.207  1.0
  F  F22  1  0.814  0.917  0.207  1.0
  F  F23  1  0.917  0.186  0.793  1.0
[/CIF]
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