data_CaSc2Ta
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.16
_cell_length_b   5.16
_cell_length_c   5.16
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CaSc2Ta
_chemical_formula_sum   'Ca1 Sc2 Ta1'
_cell_volume   97.37
_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
  Ca  Ca0  1  0.0  0.0  0.0  1.0
  Sc  Sc1  1  0.65  0.65  0.65  1.0
  Sc  Sc2  1  0.48  0.48  0.48  1.0
  Ta  Ta3  1  0.83  0.83  0.83  1.0

data_CaSc2Ta
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.16
_cell_length_b   5.16
_cell_length_c   12.65
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   CaSc2Ta
_chemical_formula_sum   'Ca3 Sc6 Ta3'
_cell_volume   292.11
_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
  Ca  Ca0  3  0.0  0.0  0.0  1.0
  Sc  Sc1  3  0.0  0.0  0.35  1.0
  Sc  Sc2  3  0.0  0.0  0.52  1.0
  Ta  Ta3  3  0.0  0.0  0.17  1.0

Ca Sc Sc Ta
Ca Sc Sc Ta 0 3 - - - 1 2 o o o 1 3 o o o 
CaSc2Ta crystallizes in the trigonal R3m space group. Ca(1) is bonded in a distorted single-bond geometry to three equivalent Sc(1), three equivalent Sc(2), and one Ta(1) atom. All Ca(1)-Sc(1) bond lengths are 2.99 Å. All Ca(1)-Sc(2) bond lengths are 3.49 Å. The Ca(1)-Ta(1) bond length is 2.20 Å. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded to three equivalent Ca(1), one Sc(2), and one Ta(1) atom to form distorted corner-sharing ScCa3ScTa trigonal bipyramids. The Sc(1)-Sc(2) bond length is 2.20 Å. The Sc(1)-Ta(1) bond length is 2.20 Å. In the second Sc site, Sc(2) is bonded in a 7-coordinate geometry to three equivalent Ca(1), one Sc(1), and three equivalent Ta(1) atoms. All Sc(2)-Ta(1) bond lengths are 2.99 Å. Ta(1) is bonded in a distorted linear geometry to one Ca(1), one Sc(1), and three equivalent Sc(2) atoms.