data_YbEr2Be
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.19
_cell_length_b   5.19
_cell_length_c   5.19
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   YbEr2Be
_chemical_formula_sum   'Yb1 Er2 Be1'
_cell_volume   98.93
_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
  Yb  Yb3  1  0.67  0.67  0.67  1.0
  Er  Er1  1  0.51  0.51  0.51  1.0
  Er  Er2  1  0.84  0.84  0.84  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0

data_YbEr2Be
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.19
_cell_length_b   5.19
_cell_length_c   12.72
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   YbEr2Be
_chemical_formula_sum   'Yb3 Er6 Be3'
_cell_volume   296.79
_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
  Yb  Yb0  3  0.0  0.0  0.33  1.0
  Er  Er1  3  0.0  0.0  0.16  1.0
  Er  Er2  3  0.0  0.0  0.49  1.0
  Be  Be3  3  0.0  0.0  0.0  1.0

Yb Er Er Be
BeYbEr2 crystallizes in the trigonal R3m space group. Be(1) is bonded to three equivalent Yb(1) and one Er(2) atom to form distorted BeYb3Er trigonal pyramids that share  a cornercorner with one Yb(1)Er2Be3 trigonal bipyramid and corners with six equivalent Be(1)Yb3Er trigonal pyramids. All Be(1)-Yb(1) bond lengths are 3.00 Å. The Be(1)-Er(2) bond length is 2.09 Å. Yb(1) is bonded to three equivalent Be(1), one Er(1), and one Er(2) atom to form distorted YbEr2Be3 trigonal bipyramids that share corners with six equivalent Yb(1)Er2Be3 trigonal bipyramids and  a cornercorner with one Be(1)Yb3Er trigonal pyramid. The Yb(1)-Er(1) bond length is 2.09 Å. The Yb(1)-Er(2) bond length is 2.09 Å. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a single-bond geometry to one Yb(1) atom. In the second Er site, Er(2) is bonded in a linear geometry to one Be(1) and one Yb(1) atom.