data_Zr3AgSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.98
_cell_length_b   4.98
_cell_length_c   4.98
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Zr3AgSe
_chemical_formula_sum   'Zr3 Ag1 Se1'
_cell_volume   123.43
_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
  Zr  Zr1  1  0.0  0.49  0.0  1.0
  Zr  Zr2  1  0.0  0.0  0.49  1.0
  Zr  Zr3  1  0.49  0.0  0.0  1.0
  Ag  Ag4  1  0.49  0.49  0.49  1.0
  Se  Se0  1  0.0  0.0  0.0  1.0

data_Zr3AgSe
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.04
_cell_length_b   7.04
_cell_length_c   8.62
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Zr3AgSe
_chemical_formula_sum   'Zr9 Ag3 Se3'
_cell_volume   370.28
_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
  Zr  Zr0  9  0.17  0.34  0.83  1.0
  Ag  Ag1  3  0.0  0.0  0.49  1.0
  Se  Se2  3  0.0  0.0  0.0  1.0

Zr Zr Zr Ag Se
Zr Zr Zr Ag Se 0 4 o o o 0 4 o + o 0 3 o o o 0 3 o o - 0 3 - o o 0 3 - o - 1 4 o o o 1 4 o o + 1 3 o o o 1 3 o - o 1 3 - o o 1 3 - - o 2 4 o o o 2 4 + o o 2 3 o o o 2 3 o o - 2 3 o - o 2 3 o - - 
Zr3AgSe is (Cubic) Perovskite structured and crystallizes in the trigonal R3m space group. Zr(1) is bonded in a linear geometry to four equivalent Ag(1) and two equivalent Se(1) atoms. There are a spread of Zr(1)-Ag(1) bond distances ranging from 3.45-3.59 Å. There is one shorter (2.44 Å) and one longer (2.54 Å) Zr(1)-Se(1) bond length. Ag(1) is bonded to twelve equivalent Zr(1) atoms to form AgZr12 cuboctahedra that share corners with twelve equivalent Ag(1)Zr12 cuboctahedra, faces with six equivalent Ag(1)Zr12 cuboctahedra, and faces with eight equivalent Se(1)Zr6 octahedra. Se(1) is bonded to six equivalent Zr(1) atoms to form SeZr6 octahedra that share corners with six equivalent Se(1)Zr6 octahedra and faces with eight equivalent Ag(1)Zr12 cuboctahedra. The corner-sharing octahedra are not tilted.