data_SrNbCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.3
_cell_length_b   5.3
_cell_length_c   5.3
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrNbCl
_chemical_formula_sum   'Sr1 Nb1 Cl1'
_cell_volume   105.55
_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  Sr2  1  0.75  0.75  0.75  1.0
  Nb  Nb1  1  0.88  0.88  0.88  1.0
  Cl  Cl0  1  0.0  0.0  0.0  1.0

data_SrNbCl
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.3
_cell_length_b   5.3
_cell_length_c   12.99
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrNbCl
_chemical_formula_sum   'Sr3 Nb3 Cl3'
_cell_volume   316.64
_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  0.25  1.0
  Nb  Nb1  3  0.0  0.0  0.12  1.0
  Cl  Cl2  3  0.0  0.0  0.0  1.0

Sr Nb Cl
Sr Nb Cl 0 1 o o o 1 2 + + + 
SrNbCl crystallizes in the trigonal R3m space group. Sr(1) is bonded to one Nb(1) and three equivalent Cl(1) atoms to form SrNbCl3 tetrahedra that share  a cornercorner with one Cl(1)Sr3Nb tetrahedra and corners with six equivalent Sr(1)NbCl3 tetrahedra. The Sr(1)-Nb(1) bond length is 1.62 Å. All Sr(1)-Cl(1) bond lengths are 3.25 Å. Nb(1) is bonded in a linear geometry to one Sr(1) and one Cl(1) atom. The Nb(1)-Cl(1) bond length is 1.62 Å. Cl(1) is bonded to three equivalent Sr(1) and one Nb(1) atom to form distorted ClSr3Nb tetrahedra that share  a cornercorner with one Sr(1)NbCl3 tetrahedra and corners with six equivalent Cl(1)Sr3Nb tetrahedra.