The crystal structure described by Na2BeO2 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the third Na site, Na(3) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form distorted NaO4 trigonal pyramids that share  a cornercorner with one Be(2)O4 tetrahedra, corners with two equivalent Na(3)O4 trigonal pyramids, and  an edgeedge with one Be(2)O4 tetrahedra. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one O(3), one O(4), and two equivalent O(2) atoms. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded in a distorted trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second Be site, Be(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form BeO4 tetrahedra that share  a cornercorner with one Na(3)O4 trigonal pyramid,  an edgeedge with one Be(2)O4 tetrahedra, and  an edgeedge with one Na(3)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(3), and one Be(1) atom. In the second O site, O(4) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), and two equivalent Be(2) atoms. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), one Be(1), and one Be(2) atom. In the fourth O site, O(2) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), two equivalent Na(4), one Be(1), and one Be(2) atom. is represented by the CIF card [CIF]
data_Na2BeO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.274
_cell_length_b   7.815
_cell_length_c   12.771
_cell_angle_alpha   61.572
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   462.931
_cell_formula_units_Z   8
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  0.444  0.925  0.625  1.0
  Na  Na1  1  0.944  0.075  0.875  1.0
  Na  Na2  1  0.169  0.354  0.967  1.0
  Na  Na3  1  0.669  0.646  0.533  1.0
  Na  Na4  1  0.331  0.354  0.467  1.0
  Na  Na5  1  0.831  0.646  0.033  1.0
  Na  Na6  1  0.385  0.579  0.168  1.0
  Na  Na7  1  0.885  0.421  0.332  1.0
  Na  Na8  1  0.115  0.579  0.668  1.0
  Na  Na9  1  0.615  0.421  0.832  1.0
  Na  Na10  1  0.556  0.075  0.375  1.0
  Na  Na11  1  0.056  0.925  0.125  1.0
  Na  Na12  1  0.940  0.825  0.764  1.0
  Na  Na13  1  0.440  0.175  0.736  1.0
  Na  Na14  1  0.060  0.175  0.236  1.0
  Na  Na15  1  0.560  0.825  0.264  1.0
  Be  Be16  1  0.378  0.739  0.877  1.0
  Be  Be17  1  0.878  0.261  0.623  1.0
  Be  Be18  1  0.122  0.739  0.377  1.0
  Be  Be19  1  0.622  0.261  0.123  1.0
  Be  Be20  1  0.457  0.909  0.961  1.0
  Be  Be21  1  0.957  0.091  0.539  1.0
  Be  Be22  1  0.543  0.091  0.039  1.0
  Be  Be23  1  0.043  0.909  0.461  1.0
  O  O24  1  0.776  0.248  0.021  1.0
  O  O25  1  0.276  0.752  0.479  1.0
  O  O26  1  0.724  0.248  0.521  1.0
  O  O27  1  0.224  0.752  0.979  1.0
  O  O28  1  0.113  0.127  0.642  1.0
  O  O29  1  0.613  0.873  0.858  1.0
  O  O30  1  0.387  0.127  0.142  1.0
  O  O31  1  0.887  0.873  0.358  1.0
  O  O32  1  0.303  0.637  0.805  1.0
  O  O33  1  0.803  0.363  0.695  1.0
  O  O34  1  0.697  0.363  0.195  1.0
  O  O35  1  0.197  0.637  0.305  1.0
  O  O36  1  0.135  0.131  0.423  1.0
  O  O37  1  0.635  0.869  0.077  1.0
  O  O38  1  0.865  0.869  0.577  1.0
  O  O39  1  0.365  0.131  0.923  1.0
[/CIF]
.
The crystal structure described by Na2BeO2 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the third Na site, Na(3) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form distorted NaO4 trigonal pyramids that share  a cornercorner with one Be(2)O4 tetrahedra, corners with two equivalent Na(3)O4 trigonal pyramids, and  an edgeedge with one Be(2)O4 tetrahedra. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one O(3), one O(4), and two equivalent O(2) atoms. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded in a distorted trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second Be site, Be(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form BeO4 tetrahedra that share  a cornercorner with one Na(3)O4 trigonal pyramid,  an edgeedge with one Be(2)O4 tetrahedra, and  an edgeedge with one Na(3)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(3), and one Be(1) atom. In the second O site, O(4) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), and two equivalent Be(2) atoms. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), one Be(1), and one Be(2) atom. In the fourth O site, O(2) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), two equivalent Na(4), one Be(1), and one Be(2) atom. is represented by the CIF card [CIF]
data_Na2BeO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.274
_cell_length_b   7.815
_cell_length_c   12.771
_cell_angle_alpha   61.572
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   462.931
_cell_formula_units_Z   8
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  0.444  0.925  0.625  1.0
  Na  Na1  1  0.944  0.075  0.875  1.0
  Na  Na2  1  0.169  0.354  0.967  1.0
  Na  Na3  1  0.669  0.646  0.533  1.0
  Na  Na4  1  0.331  0.354  0.467  1.0
  Na  Na5  1  0.831  0.646  0.033  1.0
  Na  Na6  1  0.385  0.579  0.168  1.0
  Na  Na7  1  0.885  0.421  0.332  1.0
  Na  Na8  1  0.115  0.579  0.668  1.0
  Na  Na9  1  0.615  0.421  0.832  1.0
  Na  Na10  1  0.556  0.075  0.375  1.0
  Na  Na11  1  0.056  0.925  0.125  1.0
  Na  Na12  1  0.940  0.825  0.764  1.0
  Na  Na13  1  0.440  0.175  0.736  1.0
  Na  Na14  1  0.060  0.175  0.236  1.0
  Na  Na15  1  0.560  0.825  0.264  1.0
  Be  Be16  1  0.378  0.739  0.877  1.0
  Be  Be17  1  0.878  0.261  0.623  1.0
  Be  Be18  1  0.122  0.739  0.377  1.0
  Be  Be19  1  0.622  0.261  0.123  1.0
  Be  Be20  1  0.457  0.909  0.961  1.0
  Be  Be21  1  0.957  0.091  0.539  1.0
  Be  Be22  1  0.543  0.091  0.039  1.0
  Be  Be23  1  0.043  0.909  0.461  1.0
  O  O24  1  0.776  0.248  0.021  1.0
  O  O25  1  0.276  0.752  0.479  1.0
  O  O26  1  0.724  0.248  0.521  1.0
  O  O27  1  0.224  0.752  0.979  1.0
  O  O28  1  0.113  0.127  0.642  1.0
  O  O29  1  0.613  0.873  0.858  1.0
  O  O30  1  0.387  0.127  0.142  1.0
  O  O31  1  0.887  0.873  0.358  1.0
  O  O32  1  0.303  0.637  0.805  1.0
  O  O33  1  0.803  0.363  0.695  1.0
  O  O34  1  0.697  0.363  0.195  1.0
  O  O35  1  0.197  0.637  0.305  1.0
  O  O36  1  0.135  0.131  0.423  1.0
  O  O37  1  0.635  0.869  0.077  1.0
  O  O38  1  0.865  0.869  0.577  1.0
  O  O39  1  0.365  0.131  0.923  1.0
[/CIF]
.