data_DySnAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.08
_cell_length_b   5.08
_cell_length_c   5.08
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   DySnAs2
_chemical_formula_sum   'Dy1 Sn1 As2'
_cell_volume   92.5
_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
  Dy  Dy2  1  0.59  0.59  0.59  1.0
  Sn  Sn3  1  0.0  0.0  0.0  1.0
  As  As0  1  0.38  0.38  0.38  1.0
  As  As1  1  0.79  0.79  0.79  1.0

data_DySnAs2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.08
_cell_length_b   5.08
_cell_length_c   12.43
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   DySnAs2
_chemical_formula_sum   'Dy3 Sn3 As6'
_cell_volume   277.5
_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
  Dy  Dy0  3  0.0  0.0  0.41  1.0
  Sn  Sn1  3  0.0  0.0  0.0  1.0
  As  As2  3  0.0  0.0  0.21  1.0
  As  As3  3  0.0  0.0  0.62  1.0

Dy Sn As As
Dy Sn As As 0 2 o o o 0 2 o o + 0 2 + o o 0 2 o + o 0 3 o - o 0 3 - o o 0 3 o o - 0 3 o o o 0 1 o + + 0 1 + o + 0 1 + + o 1 3 - - - 1 3 - - o 1 3 o - - 1 3 - o - 1 2 - o o 1 2 o - o 1 2 o o - 2 3 - o o 2 3 o - o 2 3 o o - 
DySnAs2 is Heusler structured and crystallizes in the trigonal R3m space group. Dy(1) is bonded in a distorted linear geometry to three equivalent Sn(1), one As(1), and one As(2) atom. All Dy(1)-Sn(1) bond lengths are 3.08 Å. The Dy(1)-As(1) bond length is 2.55 Å. The Dy(1)-As(2) bond length is 2.55 Å. Sn(1) is bonded in a 7-coordinate geometry to three equivalent Dy(1), one As(2), and three equivalent As(1) atoms. The Sn(1)-As(2) bond length is 2.55 Å. All Sn(1)-As(1) bond lengths are 3.00 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a distorted single-bond geometry to one Dy(1) and three equivalent Sn(1) atoms. In the second As site, As(2) is bonded in a 2-coordinate geometry to one Dy(1) and one Sn(1) atom.