data_Ca3GeN
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.8
_cell_length_b   4.8
_cell_length_c   4.8
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca3GeN
_chemical_formula_sum   'Ca3 Ge1 N1'
_cell_volume   110.26
_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  0.0  0.0  0.4  1.0
  Ca  Ca1  1  0.0  0.4  0.0  1.0
  Ca  Ca2  1  0.4  0.0  0.0  1.0
  Ge  Ge3  1  0.4  0.4  0.4  1.0
  N  N4  1  0.0  0.0  0.0  1.0

data_Ca3GeN
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.78
_cell_length_b   6.78
_cell_length_c   8.31
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Ca3GeN
_chemical_formula_sum   'Ca9 Ge3 N3'
_cell_volume   330.79
_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
  Ca  Ca0  9  0.2  0.4  0.8  1.0
  Ge  Ge1  3  0.0  0.0  0.4  1.0
  N  N2  3  0.0  0.0  0.0  1.0

Ca Ca Ca Ge N
Ca Ca Ca Ge N 0 4 o o o 0 3 o o o 1 4 o o o 1 3 o o o 2 4 o o o 2 3 o o o 
Ca3GeN crystallizes in the trigonal R3m space group. Ca(1) is bonded in a distorted single-bond geometry to three equivalent Ge(1) and two equivalent N(1) atoms. There is one shorter (2.70 Å) and two longer (3.46 Å) Ca(1)-Ge(1) bond lengths. There is one shorter (1.91 Å) and one longer (2.89 Å) Ca(1)-N(1) bond length. Ge(1) is bonded in a 9-coordinate geometry to nine equivalent Ca(1) atoms. N(1) is bonded to six equivalent Ca(1) atoms to form distorted corner-sharing NCa6 octahedra. The corner-sharing octahedra are not tilted.