data_global _amcsd_formula_title 'Bi2Al4O9' loop_ _publ_author_name 'Niizeki N' 'Wachi M' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 127 _journal_year 1968 _journal_page_first 173 _journal_page_last 187 _publ_section_title ; The crystal structures of Bi2Mn4O10, Bi2Al4O9 and Bi2Fe4O9 ; _database_code_amcsd 0010663 _chemical_formula_sum 'Bi2 Al4 O9' _cell_length_a 7.712 _cell_length_b 8.112 _cell_length_c 5.708 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 357.091 _exptl_crystal_density_diffrn 6.230 _symmetry_space_group_name_H-M 'P b a m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,z' '1/2-x,1/2+y,-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' 'x,y,-z' '-x,-y,z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Bi 0.17040 0.16680 0.00000 0.00621 Al1 0.50000 0.00000 0.25700 0.00887 Al2 0.34700 0.33900 0.50000 0.01013 O1 0.00000 0.00000 0.50000 0.01267 O2 0.38000 0.20100 0.25100 0.01393 O3 0.14000 0.43300 0.50000 0.01267 O4 0.14300 0.42600 0.00000 0.01393