data_SrSn2Rh
_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   SrSn2Rh
_chemical_formula_sum   'Sr1 Sn2 Rh1'
_cell_volume   96.94
_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  Sr3  1  0.0  0.0  0.0  1.0
  Sn  Sn1  1  0.47  0.47  0.47  1.0
  Sn  Sn2  1  0.65  0.65  0.65  1.0
  Rh  Rh0  1  0.82  0.82  0.82  1.0

data_SrSn2Rh
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.16
_cell_length_b   5.16
_cell_length_c   12.63
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrSn2Rh
_chemical_formula_sum   'Sr3 Sn6 Rh3'
_cell_volume   290.82
_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  0.0  1.0
  Sn  Sn1  3  0.0  0.0  0.35  1.0
  Sn  Sn2  3  0.0  0.0  0.53  1.0
  Rh  Rh3  3  0.0  0.0  0.18  1.0

Sr Sn Sn Rh
Sr Sn Sn Rh 0 3 - - - 1 2 o o o 2 3 o o o 
SrRhSn2 crystallizes in the trigonal R3m space group. Sr(1) is bonded in a distorted single-bond geometry to one Rh(1), three equivalent Sn(1), and three equivalent Sn(2) atoms. The Sr(1)-Rh(1) bond length is 2.24 Å. All Sr(1)-Sn(1) bond lengths are 3.44 Å. All Sr(1)-Sn(2) bond lengths are 2.99 Å. Rh(1) is bonded in a distorted linear geometry to one Sr(1), one Sn(2), and three equivalent Sn(1) atoms. The Rh(1)-Sn(2) bond length is 2.24 Å. All Rh(1)-Sn(1) bond lengths are 2.99 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to three equivalent Sr(1), three equivalent Rh(1), and one Sn(2) atom to form distorted SnSr3SnRh3 hexagonal pyramids that share corners with three equivalent Sn(2)Sr3SnRh trigonal bipyramids, edges with six equivalent Sn(1)Sr3SnRh3 hexagonal pyramids, and faces with three equivalent Sn(2)Sr3SnRh trigonal bipyramids. The Sn(1)-Sn(2) bond length is 2.24 Å. In the second Sn site, Sn(2) is bonded to three equivalent Sr(1), one Rh(1), and one Sn(1) atom to form distorted SnSr3SnRh trigonal bipyramids that share corners with three equivalent Sn(1)Sr3SnRh3 hexagonal pyramids, corners with six equivalent Sn(2)Sr3SnRh trigonal bipyramids, and faces with three equivalent Sn(1)Sr3SnRh3 hexagonal pyramids.