data_global _amcsd_formula_title 'K4 Nb8 O34 P4 Si' loop_ _publ_author_name 'Leclaire A' 'Borel M' 'Chardon J' 'Grandin A' 'Raveau B' _journal_name_full 'Acta Crystallographica, Section C' _journal_volume 48 _journal_year 1992 _journal_page_first 1744 _journal_page_last 1747 _publ_section_title ; A niobium silicophosphate belonging to the niobium phosphate bronzeseries: K4Nb8P4SiO34 _cod_database_code 1001541 ; _database_code_amcsd 0010275 _chemical_formula_sum 'Nb8 Si P4 K4 O34' _cell_length_a 10.6050 _cell_length_b 10.6050 _cell_length_c 6.4099 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 720.896 _exptl_crystal_density_diffrn 3.675 _symmetry_space_group_name_H-M 'P -4 m 2' loop_ _space_group_symop_operation_xyz 'x,y,z' 'y,x,-z' 'y,-x,-z' 'x,-y,z' '-x,-y,z' '-y,-x,-z' '-y,x,-z' '-x,y,z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Nb1 0.50000 0.18470 0.20350 Nb2 0.17750 0.17750 0.00000 Si1 0.50000 0.50000 0.00000 P1 0.23970 0.23970 0.50000 K1 0.00000 0.00000 0.50000 K2 0.00000 0.50000 0.29230 K3 0.50000 0.50000 0.50000 O1 0.50000 0.00000 0.26100 O2 0.36380 0.17470 0.02150 O3 0.37900 0.21540 0.45300 O4 0.50000 0.38190 0.14500 O5 0.17560 0.00000 0.03200 O6 0.15860 0.19820 0.31150