data_global _amcsd_formula_title 'Na2.667 Nb6 O26 P4' loop_ _publ_author_name 'Benabbas A' 'Borel M' 'Grandin A' 'Leclaire A' 'Raveau B' _journal_name_full 'Journal of Solid State Chemistry' _journal_volume 95 _journal_year 1991 _journal_page_first 245 _journal_page_last 252 _publ_section_title ; Na2+x Nb6 P4 O26 : a novel niobium phosphate bronze isotypic of the m=3 member of the MPTBp family _cod_database_code 1001698 ; _database_code_amcsd 0013722 _chemical_formula_sum 'Nb9 P6 Na4 O39' _cell_length_a 19.80499 _cell_length_b 14.3859 _cell_length_c 5.3960 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1537.388 _exptl_crystal_density_diffrn 3.754 _symmetry_space_group_name_H-M 'P 21 21 2' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2-x,1/2+y,-z' '1/2+x,1/2-y,-z' '-x,-y,z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Nb1 0.00000 0.00000 0.26400 Nb2 0.33090 0.97971 0.23720 Nb3 0.11669 0.10021 0.76470 Nb4 0.43601 0.09682 0.74590 Nb5 0.77765 0.11139 0.74140 P1 0.21580 0.16540 0.26400 P2 0.53690 0.17870 0.25300 P3 0.88420 0.17080 0.23320 Na1 0.05870 0.21610 0.24200 Na2 0.37790 0.20600 0.24600 O1 0.06420 0.05300 0.02300 O2 -0.04530 0.12620 0.27100 O3 0.05980 0.04590 0.51700 O4 0.25950 0.07810 0.27300 O5 0.39150 0.05400 0.47400 O6 0.27650 -0.09310 0.02600 O7 0.40300 0.88740 0.21400 O8 0.37140 0.05460 -0.02200 O9 0.29400 -0.08320 0.53600 O10 0.06260 0.22180 0.76500 O11 0.17370 0.17210 0.49300 O12 0.16860 0.16800 0.03600 O13 0.18490 0.00940 0.75700 O14 0.39100 0.22420 0.71200 O15 0.50000 0.00000 0.78000 O16 0.48550 0.16530 0.05400 O17 0.50850 0.16550 0.51400 O18 0.76270 0.25160 0.72500 O19 0.85770 0.15430 -0.02400 O20 0.84000 0.13150 0.44100