data_Na3BePt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.04
_cell_length_b   5.04
_cell_length_c   5.04
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na3BePt
_chemical_formula_sum   'Na3 Be1 Pt1'
_cell_volume   128.38
_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
  Na  Na0  1  0.0  0.52  0.0  1.0
  Na  Na1  1  0.0  0.0  0.52  1.0
  Na  Na2  1  0.52  0.0  0.0  1.0
  Be  Be4  1  0.0  0.0  0.0  1.0
  Pt  Pt3  1  0.52  0.52  0.52  1.0

data_Na3BePt
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.13
_cell_length_b   7.13
_cell_length_c   8.74
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Na3BePt
_chemical_formula_sum   'Na9 Be3 Pt3'
_cell_volume   385.15
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  9  0.01  0.51  0.51  1.0
  Be  Be1  3  0.0  0.0  0.0  1.0
  Pt  Pt2  3  0.0  0.0  0.52  1.0

Na Na Na Be Pt
Na Na Na Be Pt 0 3 o o o 0 3 o + o 0 4 o o o 0 4 o o - 0 4 - o o 0 4 - o - 1 3 o o o 1 3 o o + 1 4 o o o 1 4 o - o 1 4 - o o 1 4 - - o 2 3 o o o 2 3 + o o 2 4 o o o 2 4 o o - 2 4 o - o 2 4 o - - 3 4 - - - 
Na3BePt is (Cubic) Perovskite structured and crystallizes in the trigonal R3m space group. Na(1) is bonded in a 2-coordinate geometry to two equivalent Be(1) and four equivalent Pt(1) atoms. There is one shorter (2.41 Å) and one longer (2.64 Å) Na(1)-Be(1) bond length. There are a spread of Na(1)-Pt(1) bond distances ranging from 3.41-3.73 Å. Be(1) is bonded to six equivalent Na(1) atoms to form BeNa6 octahedra that share corners with six equivalent Be(1)Na6 octahedra and faces with eight equivalent Pt(1)Na12 cuboctahedra. The corner-sharing octahedra are not tilted. Pt(1) is bonded to twelve equivalent Na(1) atoms to form distorted PtNa12 cuboctahedra that share corners with twelve equivalent Pt(1)Na12 cuboctahedra, faces with six equivalent Pt(1)Na12 cuboctahedra, and faces with eight equivalent Be(1)Na6 octahedra.