data_[Pm4Cr4O14]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [7.2953]
_cell_length_b [9.5759]
_cell_length_c [8.0033]
_cell_angle_alpha [90.0000]
_cell_angle_beta [112.4277]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Pm2Cr2O7]
_chemical_formula_sum '[Pm4 Cr4 O14]'
_cell_volume [516.8188]
_cell_formula_units_Z [2]
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
[
  Pm  Pm0  4  0.0000  0.3053  0.0000  1
  Cr  Cr1  4  0.1499  0.0000  0.7366  1
  O  O2  8  0.1422  0.1556  0.8596  1
  O  O3  4  0.0835  0.5000  0.1971  1
  O  O4  2  0.0000  0.0000  0.5000  1
]