data_global _amcsd_formula_title 'Ba2Ti3Nb4O18' loop_ _publ_author_name 'Gasperin M' _journal_name_full 'Acta Crystallographica, Section C' _journal_volume 40 _journal_year 1984 _journal_page_first 9 _journal_page_last 11 _publ_section_title ; Syntheses and Structure of a New Titanoniobate: The Trititanotetraniobate of Dibarium, Ba2Ti3Nb4O18 _cod_database_code 1001269 ; _database_code_amcsd 0009989 _chemical_formula_sum 'Ba2 Nb4 Ti3 O18' _cell_length_a 10.000 _cell_length_b 9.959 _cell_length_c 7.315 _cell_angle_alpha 90 _cell_angle_beta 111.29 _cell_angle_gamma 90 _cell_volume 678.784 _exptl_crystal_density_diffrn 5.274 _symmetry_space_group_name_H-M 'P 1 21/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,1/2+z' '-x,1/2+y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Ba1 0.20448 0.08876 0.06374 1.00000 Nb1 0.10467 0.75127 0.35107 1.00000 Ti1 0.00000 0.50000 0.00000 1.00000 Nb2 0.51820 0.26970 0.50950 0.50000 Ti2 0.51820 0.26970 0.50950 0.50000 Nb3 0.37950 0.01510 0.60550 0.50000 Ti3 0.37950 0.01510 0.60550 0.50000 O1 0.40470 0.09070 0.85150 1.00000 O2 0.58140 0.08400 0.62110 1.00000 O3 0.80740 0.07090 0.47610 1.00000 O4 0.98430 0.08830 0.25160 1.00000 O5 0.06970 0.16170 0.64580 1.00000 O6 0.32370 0.17190 0.46330 1.00000 O7 0.50960 0.16260 0.25450 1.00000 O8 0.70010 0.17400 0.04590 1.00000 O9 0.89900 0.16880 0.87550 1.00000