data_Ag2BSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.59
_cell_length_b   4.59
_cell_length_c   4.59
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ag2BSe
_chemical_formula_sum   'Ag2 B1 Se1'
_cell_volume   68.23
_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
  Ag  Ag0  1  0.62  0.62  0.62  1.0
  Ag  Ag1  1  0.86  0.86  0.86  1.0
  B  B2  1  0.0  0.0  0.0  1.0
  Se  Se3  1  0.24  0.24  0.24  1.0

data_Ag2BSe
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.59
_cell_length_b   4.59
_cell_length_c   11.24
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Ag2BSe
_chemical_formula_sum   'Ag6 B3 Se3'
_cell_volume   204.7
_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
  Ag  Ag0  3  0.0  0.0  0.14  1.0
  Ag  Ag1  3  0.0  0.0  0.38  1.0
  B  B2  3  0.0  0.0  0.0  1.0
  Se  Se3  3  0.0  0.0  0.76  1.0

Ag Ag B Se
Ag Ag B Se 0 1 o - o 0 1 - o o 0 1 o o - 0 1 o o o 0 3 o o + 0 3 o + o 0 3 + o o 0 2 o + + 0 2 + o + 0 2 + + o 1 2 + + + 1 3 + + o 1 3 + o + 1 3 o + + 2 3 o o o 2 3 o o - 2 3 - o o 2 3 o - o 
Ag2BSe crystallizes in the trigonal R3m space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 10-coordinate geometry to four equivalent Ag(2), three equivalent B(1), and three equivalent Se(1) atoms. There is one shorter (2.73 Å) and three longer (2.83 Å) Ag(1)-Ag(2) bond lengths. All Ag(1)-B(1) bond lengths are 2.70 Å. All Ag(1)-Se(1) bond lengths are 2.70 Å. In the second Ag site, Ag(2) is bonded in a distorted single-bond geometry to four equivalent Ag(1), one B(1), and three equivalent Se(1) atoms. The Ag(2)-B(1) bond length is 1.52 Å. All Ag(2)-Se(1) bond lengths are 2.70 Å. B(1) is bonded in a single-bond geometry to one Ag(2), three equivalent Ag(1), and one Se(1) atom. The B(1)-Se(1) bond length is 2.73 Å. Se(1) is bonded to three equivalent Ag(1), three equivalent Ag(2), and one B(1) atom to form distorted edge-sharing SeAg6B hexagonal pyramids.