data_Ca2SiRh
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.19
_cell_length_b   5.19
_cell_length_c   5.19
_cell_angle_alpha   128.55
_cell_angle_beta   128.55
_cell_angle_gamma   75.73
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2SiRh
_chemical_formula_sum   'Ca2 Si1 Rh1'
_cell_volume   83.18
_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
  Ca  Ca0  1  0.25  0.0  0.05  1.0
  Ca  Ca1  1  0.0  0.25  0.05  1.0
  Si  Si3  1  0.0  0.0  0.0  1.0
  Rh  Rh2  1  0.0  0.0  0.1  1.0

data_Ca2SiRh
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.37
_cell_length_b   6.37
_cell_length_c   5.19
_cell_angle_alpha   90.0
_cell_angle_beta   127.86
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ca2SiRh
_chemical_formula_sum   'Ca4 Si2 Rh2'
_cell_volume   166.36
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  4  0.08  0.13  0.2  1.0
  Si  Si1  2  0.0  0.0  0.0  1.0
  Rh  Rh2  2  0.4  0.5  0.9  1.0

Ca Ca Si Rh
Ca2RhSi is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ca2RhSi clusters. Ca(1) is bonded in a single-bond geometry to one Si(1) atom. The Ca(1)-Si(1) bond length is 1.17 Å. Rh(1) is bonded in a single-bond geometry to one Si(1) atom. The Rh(1)-Si(1) bond length is 0.51 Å. Si(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one Rh(1) atom.