data_SrGe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.07
_cell_length_b   6.07
_cell_length_c   6.07
_cell_angle_alpha   132.78
_cell_angle_beta   132.78
_cell_angle_gamma   69.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrGe4
_chemical_formula_sum   'Sr1 Ge4'
_cell_volume   118.53
_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  Sr4  1  0.0  0.0  0.0  1.0
  Ge  Ge0  1  0.43  0.0  0.5  1.0
  Ge  Ge1  1  0.0  0.43  0.5  1.0
  Ge  Ge2  1  0.0  0.0  0.37  1.0
  Ge  Ge3  1  0.0  0.0  0.64  1.0

data_SrGe4
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.88
_cell_length_b   6.88
_cell_length_c   6.07
_cell_angle_alpha   90.0
_cell_angle_beta   124.5
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrGe4
_chemical_formula_sum   'Sr2 Ge8'
_cell_volume   237.07
_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  2  0.0  0.0  0.0  1.0
  Ge  Ge1  4  0.21  0.28  0.93  1.0
  Ge  Ge2  2  0.13  0.5  0.63  1.0
  Ge  Ge3  2  0.36  0.0  0.36  1.0

Sr Ge Ge Ge Ge
Sr Ge Ge Ge Ge 0 1 - o - 0 1 o o o 0 2 o o o 0 2 o - - 0 4 o o - 0 3 o o o 1 3 o o o 2 3 o o o 3 4 o o o 
SrGe4 crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a distorted hexagonal planar geometry to one Ge(2), one Ge(3), and four equivalent Ge(1) atoms. The Sr(1)-Ge(2) bond length is 2.28 Å. The Sr(1)-Ge(3) bond length is 2.20 Å. There are two shorter (2.31 Å) and two longer (2.62 Å) Sr(1)-Ge(1) bond lengths. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 2-coordinate geometry to two equivalent Sr(1) and one Ge(2) atom. The Ge(1)-Ge(2) bond length is 2.18 Å. In the second Ge site, Ge(2) is bonded in a 4-coordinate geometry to one Sr(1), one Ge(3), and two equivalent Ge(1) atoms. The Ge(2)-Ge(3) bond length is 1.60 Å. In the third Ge site, Ge(3) is bonded in a distorted linear geometry to one Sr(1) and one Ge(2) atom.