data_BeCrAu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.0
_cell_length_b   4.0
_cell_length_c   4.0
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BeCrAu
_chemical_formula_sum   'Be1 Cr1 Au1'
_cell_volume   45.18
_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
  Be  Be1  1  0.0  0.0  0.0  1.0
  Cr  Cr2  1  0.41  0.41  0.41  1.0
  Au  Au0  1  0.24  0.24  0.24  1.0

data_BeCrAu
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.0
_cell_length_b   4.0
_cell_length_c   9.79
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   BeCrAu
_chemical_formula_sum   'Be3 Cr3 Au3'
_cell_volume   135.54
_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
  Be  Be0  3  0.0  0.0  0.0  1.0
  Cr  Cr1  3  0.0  0.0  0.59  1.0
  Au  Au2  3  0.0  0.0  0.76  1.0

Be Cr Au
Be Cr Au 0 2 o - o 0 2 - o o 0 2 o o - 0 2 o o o 0 1 - o o 0 1 o - o 0 1 o o - 1 2 o o o 
BeCrAu is half-Heusler structured and crystallizes in the trigonal R3m space group. Be(1) is bonded in a 7-coordinate geometry to three equivalent Cr(1) and four equivalent Au(1) atoms. All Be(1)-Cr(1) bond lengths are 2.44 Å. There is one shorter (2.35 Å) and three longer (2.48 Å) Be(1)-Au(1) bond lengths. Cr(1) is bonded in a single-bond geometry to three equivalent Be(1) and one Au(1) atom. The Cr(1)-Au(1) bond length is 1.70 Å. Au(1) is bonded in a 1-coordinate geometry to four equivalent Be(1) and one Cr(1) atom.