The crystal structure described by LaFeAsO is Parent of FeAs superconductors structured and crystallizes in the monoclinic P2_1/c space group. La(1) is bonded in a 4-coordinate geometry to four equivalent As(1) and four equivalent O(1) atoms. Fe(1) is bonded to four equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing FeAs4 tetrahedra. As(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Fe(1) atoms. O(1) is bonded to four equivalent La(1) atoms to form a mixture of edge and corner-sharing OLa4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaFeAsO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.121
_cell_length_b   4.145
_cell_length_c   9.209
_cell_angle_alpha   90.000
_cell_angle_beta   89.595
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   157.265
_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
  As  As0  1  0.241  0.750  0.328  1.0
  As  As1  1  0.759  0.250  0.672  1.0
  Fe  Fe2  1  0.746  0.750  0.499  1.0
  Fe  Fe3  1  0.254  0.250  0.501  1.0
  La  La4  1  0.251  0.750  0.870  1.0
  La  La5  1  0.749  0.250  0.130  1.0
  O  O6  1  0.750  0.750  0.000  1.0
  O  O7  1  0.250  0.250  1.000  1.0
[/CIF]
.
The crystal structure described by LaFeAsO is Parent of FeAs superconductors structured and crystallizes in the monoclinic P2_1/c space group. La(1) is bonded in a 4-coordinate geometry to four equivalent As(1) and four equivalent O(1) atoms. Fe(1) is bonded to four equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing FeAs4 tetrahedra. As(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Fe(1) atoms. O(1) is bonded to four equivalent La(1) atoms to form a mixture of edge and corner-sharing OLa4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaFeAsO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.121
_cell_length_b   4.145
_cell_length_c   9.209
_cell_angle_alpha   90.000
_cell_angle_beta   89.595
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   157.265
_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
  As  As0  1  0.241  0.750  0.328  1.0
  As  As1  1  0.759  0.250  0.672  1.0
  Fe  Fe2  1  0.746  0.750  0.499  1.0
  Fe  Fe3  1  0.254  0.250  0.501  1.0
  La  La4  1  0.251  0.750  0.870  1.0
  La  La5  1  0.749  0.250  0.130  1.0
  O  O6  1  0.750  0.750  0.000  1.0
  O  O7  1  0.250  0.250  1.000  1.0
[/CIF]
.