data_BaSrCuPt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   5.2
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaSrCuPt
_chemical_formula_sum   'Ba1 Sr1 Cu1 Pt1'
_cell_volume   99.41
_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
  Ba  Ba0  1  0.84  0.84  0.84  1.0
  Sr  Sr3  1  0.68  0.68  0.68  1.0
  Cu  Cu1  1  0.0  0.0  0.0  1.0
  Pt  Pt2  1  0.52  0.52  0.52  1.0

data_BaSrCuPt
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   12.74
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   BaSrCuPt
_chemical_formula_sum   'Ba3 Sr3 Cu3 Pt3'
_cell_volume   298.23
_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
  Ba  Ba0  3  0.0  0.0  0.16  1.0
  Sr  Sr1  3  0.0  0.0  0.32  1.0
  Cu  Cu2  3  0.0  0.0  0.0  1.0
  Pt  Pt3  3  0.0  0.0  0.48  1.0

Ba Sr Cu Pt
BaSrPtCu crystallizes in the trigonal R3m space group. Ba(1) is bonded to one Sr(1), three equivalent Pt(1), and one Cu(1) atom to form distorted BaSrCuPt3 trigonal bipyramids that share corners with six equivalent Ba(1)SrCuPt3 trigonal bipyramids and  a cornercorner with one Pt(1)Ba3Sr trigonal pyramid. The Ba(1)-Sr(1) bond length is 2.06 Å. All Ba(1)-Pt(1) bond lengths are 3.00 Å. The Ba(1)-Cu(1) bond length is 2.06 Å. Sr(1) is bonded in a 5-coordinate geometry to one Ba(1), one Pt(1), and three equivalent Cu(1) atoms. The Sr(1)-Pt(1) bond length is 2.06 Å. All Sr(1)-Cu(1) bond lengths are 3.00 Å. Pt(1) is bonded to three equivalent Ba(1) and one Sr(1) atom to form distorted PtBa3Sr trigonal pyramids that share  a cornercorner with one Ba(1)SrCuPt3 trigonal bipyramid and corners with six equivalent Pt(1)Ba3Sr trigonal pyramids. Cu(1) is bonded in a distorted single-bond geometry to one Ba(1) and three equivalent Sr(1) atoms.