data_Sr2NbCr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.23
_cell_length_b   4.23
_cell_length_c   5.4
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr2NbCr
_chemical_formula_sum   'Sr2 Nb1 Cr1'
_cell_volume   96.89
_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  0.12  0.0  0.7  1.0
  Sr  Sr3  1  0.0  0.12  0.7  1.0
  Nb  Nb1  1  0.12  0.12  0.0  1.0
  Cr  Cr0  1  0.0  0.0  0.0  1.0

data_Sr2NbCr
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.99
_cell_length_b   5.99
_cell_length_c   5.4
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Sr2NbCr
_chemical_formula_sum   'Sr4 Nb2 Cr2'
_cell_volume   193.78
_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
  Sr  Sr0  4  0.06  0.06  0.7  1.0
  Nb  Nb1  2  0.12  0.0  0.0  1.0
  Cr  Cr2  2  0.0  0.0  0.0  1.0

Sr Sr Nb Cr
Sr Sr Nb Cr 0 1 o o o 2 3 o o o 
Sr2NbCr is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Sr2NbCr clusters. Sr(1) is bonded in a 3-coordinate geometry to one Sr(1), one Nb(1), and one Cr(1) atom. The Sr(1)-Sr(1) bond length is 0.70 Å. The Sr(1)-Nb(1) bond length is 1.69 Å. The Sr(1)-Cr(1) bond length is 1.69 Å. Nb(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one Cr(1) atom. The Nb(1)-Cr(1) bond length is 0.70 Å. Cr(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one Nb(1) atom.