data_1001471
_chemical_name_systematic          'Bismuth lanthanum oxide (8/10/27)'
_chemical_formula_structural       'Bi8 La10 O27'
_chemical_formula_sum              'Bi8 La10 O27'
_publ_section_title
;
An oxygen deficient fluorite with a tunnel structure: Bi~8~La~10~O~27~
;
loop_
_publ_author_name
  'Michel, C'
  'Caignaert, V'
  'Raveau, B'
_journal_name_full                 'Journal of Solid State Chemistry'
_journal_coden_ASTM                JSSCBI
_journal_volume                    90
_journal_year                      1991
_journal_page_first                296
_journal_page_last                 301
_cell_length_a                     12.079(2)
_cell_length_b                     16.348(4)
_cell_length_c                     4.0988(5)
_cell_angle_alpha                  90
_cell_angle_beta                   90
_cell_angle_gamma                  90
_cell_volume                       809.4
_cell_formula_units_Z              1
_symmetry_space_group_name_H-M     'I m m m'
_symmetry_Int_Tables_number        71
_symmetry_cell_setting             orthorhombic
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  'x,-y,-z'
  '-x,y,-z'
  '-x,-y,z'
  '-x,-y,-z'
  '-x,y,z'
  'x,-y,z'
  'x,y,-z'
  '1/2+x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '1/2-x,1/2-y,1/2+z'
  '1/2-x,1/2-y,1/2-z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '1/2+x,1/2+y,1/2-z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
  Bi3+   3.000
  La3+   3.000
  O2-   -2.000
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_calc_flag
  Bi1   Bi3+   4 e 0.3110(6) 0. 0. 1.  0 d
  Bi2   Bi3+   4 g 0. 0.3316(4) 0. 1.  0 d
  La1   La3+   8 n 0.3430(5) 0.3225(3) 0. 1.  0 d
  La2   La3+   2 a 0. 0. 0. 1.  0 d
  O1    O2-    4 h 0. 0.0916(9) 0.5 1.  0 d
  O2    O2-    4 h 0. 0.2776(7) 0.5 1.  0 d
  O3    O2-    8 n 0.1878(8) 0.0864 0. 1.  0 d
  O4    O2-    8 n 0.1541(6) 0.2647(5) 0. 1.  0 d
  O5    O2-    8 n 0.1672(28) 0.4446(17) 0. 0.375  0 d
_refine_ls_R_factor_all            0.051