data_Sr2TbEu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.29
_cell_length_b   6.29
_cell_length_c   6.29
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr2TbEu
_chemical_formula_sum   'Sr2 Tb1 Eu1'
_cell_volume   175.57
_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
  Sr  Sr1  1  0.67  0.67  0.67  1.0
  Sr  Sr2  1  0.22  0.22  0.22  1.0
  Tb  Tb3  1  0.44  0.44  0.44  1.0
  Eu  Eu0  1  0.0  0.0  0.0  1.0

data_Sr2TbEu
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.29
_cell_length_b   6.29
_cell_length_c   15.4
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Sr2TbEu
_chemical_formula_sum   'Sr6 Tb3 Eu3'
_cell_volume   526.72
_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
  Sr  Sr0  3  0.0  0.0  0.33  1.0
  Sr  Sr1  3  0.0  0.0  0.78  1.0
  Tb  Tb2  3  0.0  0.0  0.56  1.0
  Eu  Eu3  3  0.0  0.0  0.0  1.0

Sr Sr Tb Eu
Sr2TbEu is Heusler structured and crystallizes in the trigonal R3m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 4-coordinate geometry to four equivalent Tb(1) and three equivalent Eu(1) atoms. There is one shorter (3.42 Å) and three longer (4.01 Å) Sr(1)-Tb(1) bond lengths. All Sr(1)-Eu(1) bond lengths are 3.63 Å. In the second Sr site, Sr(2) is bonded in a 2-coordinate geometry to four equivalent Tb(1) and four equivalent Eu(1) atoms. There is one shorter (3.42 Å) and three longer (4.01 Å) Sr(2)-Tb(1) bond lengths. There is one shorter (3.42 Å) and three longer (4.01 Å) Sr(2)-Eu(1) bond lengths. Tb(1) is bonded in a 11-coordinate geometry to four equivalent Sr(1), four equivalent Sr(2), and three equivalent Eu(1) atoms. All Tb(1)-Eu(1) bond lengths are 4.01 Å. Eu(1) is bonded in a 10-coordinate geometry to three equivalent Sr(1), four equivalent Sr(2), and three equivalent Tb(1) atoms.