data_global _amcsd_formula_title 'Na4 Nb8 O32 P4' loop_ _publ_author_name 'Costentin G' 'Borel M' 'Grandin A' 'Leclaire A' 'Raveau B' _journal_name_full 'Materials Research Bulletin' _journal_volume 26 _journal_year 1991 _journal_page_first 1051 _journal_page_last 1057 _publ_section_title ; Phosphate niobium bronzes and bronzoids with the MPTBP structure: Na4Nb8P4O32 and Na4-xAxNb7MP4O32 fourth members of the series Ax(PO2)4(NbO3)2m _cod_database_code 1001699 ; _database_code_amcsd 0014362 _chemical_formula_sum 'Nb2 P Na O8' _cell_length_a 6.635 _cell_length_b 5.352 _cell_length_c 17.967 _cell_angle_alpha 90 _cell_angle_beta 90.33 _cell_angle_gamma 90 _cell_volume 638.007 _exptl_crystal_density_diffrn 3.829 _symmetry_space_group_name_H-M 'P 1 21 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,1/2+y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Nb1 -0.00690 0.25000 0.12515 Nb2 0.33960 0.25000 0.96040 Nb3 0.15960 0.25100 0.46032 Nb4 0.50650 0.24700 0.62490 P1 0.69010 0.26200 0.81330 P2 0.80910 0.25200 0.31400 Na1 0.20300 0.24300 0.78260 Na2 0.29700 0.25400 0.28310 O1 0.78900 0.46900 0.09970 O2 0.88100 0.27900 0.23290 O3 0.86200 -0.03600 0.09750 O4 0.22600 0.02200 0.17560 O5 0.15900 0.29100 0.03930 O6 0.14200 0.56200 0.17770 O7 0.50800 0.29600 0.86340 O8 0.54200 0.04500 -0.00010 O9 0.34000 0.31300 0.54010 O10 -0.00700 0.30000 0.36320 O11 0.36300 0.02900 0.40410 O12 -0.04800 0.45800 0.49840 O13 0.29200 0.52300 0.39850 O14 0.61500 0.28100 0.73240 O15 0.27100 0.02500 0.67190 O16 0.35700 0.56300 0.68010