data_global _amcsd_formula_title 'Bi8 La10 O27' loop_ _publ_author_name 'Michel C' 'Caignaert V' 'Raveau B' _journal_name_full 'Journal of Solid State Chemistry' _journal_volume 90 _journal_year 1991 _journal_page_first 296 _journal_page_last 301 _publ_section_title ; An oxygen deficient fluorite with a tunnel structure: Bi8La10O27 _cod_database_code 1001470 ; _database_code_amcsd 0013696 _chemical_formula_sum 'Bi4 La5 O13.5' _cell_length_a 12.079 _cell_length_b 16.348 _cell_length_c 4.0988 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 809.380 _exptl_crystal_density_diffrn 7.166 _symmetry_space_group_name_H-M 'I m m m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' 'x,-y,z' '1/2+x,1/2-y,1/2+z' '-x,y,-z' '1/2-x,1/2+y,1/2-z' '-x,y,z' '1/2-x,1/2+y,1/2+z' 'x,-y,-z' '1/2+x,1/2-y,1/2-z' 'x,y,-z' '1/2+x,1/2+y,1/2-z' '-x,-y,z' '1/2-x,1/2-y,1/2+z' '-x,-y,-z' '1/2-x,1/2-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Bi1 0.31580 0.00000 0.00000 1.00000 Bi2 0.00000 0.33940 0.00000 1.00000 La1 0.34920 0.32030 0.00000 1.00000 La2 0.00000 0.00000 0.00000 1.00000 O1 0.00000 0.06300 0.50000 1.00000 O2 0.00000 0.24100 0.50000 1.00000 O3 0.22800 0.07300 0.00000 1.00000 O4 0.16100 0.26000 0.00000 1.00000 O5 0.15400 0.43900 0.00000 0.37500