data_NaYbEu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.15
_cell_length_b   6.15
_cell_length_c   6.15
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaYbEu2
_chemical_formula_sum   'Na1 Yb1 Eu2'
_cell_volume   164.33
_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  Na2  1  0.0  0.0  0.0  1.0
  Yb  Yb3  1  0.35  0.35  0.35  1.0
  Eu  Eu0  1  0.52  0.52  0.52  1.0
  Eu  Eu1  1  0.17  0.17  0.17  1.0

data_NaYbEu2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.15
_cell_length_b   6.15
_cell_length_c   15.06
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   NaYbEu2
_chemical_formula_sum   'Na3 Yb3 Eu6'
_cell_volume   492.98
_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  3  0.0  0.0  0.0  1.0
  Yb  Yb1  3  0.0  0.0  0.65  1.0
  Eu  Eu2  3  0.0  0.0  0.48  1.0
  Eu  Eu3  3  0.0  0.0  0.83  1.0

Na Yb Eu Eu
Na Yb Eu Eu 0 3 o o o 1 3 o o o 1 2 o o o 
NaYbEu2 crystallizes in the trigonal R3m space group. Na(1) is bonded in a distorted single-bond geometry to three equivalent Yb(1) and one Eu(2) atom. All Na(1)-Yb(1) bond lengths are 3.56 Å. The Na(1)-Eu(2) bond length is 2.62 Å. Yb(1) is bonded to three equivalent Na(1), one Eu(1), and one Eu(2) atom to form distorted corner-sharing YbNa3Eu2 trigonal bipyramids. The Yb(1)-Eu(1) bond length is 2.62 Å. The Yb(1)-Eu(2) bond length is 2.62 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted single-bond geometry to one Yb(1) atom. In the second Eu site, Eu(2) is bonded in a linear geometry to one Na(1) and one Yb(1) atom.