data_global _amcsd_formula_title 'Na7Fe3(As2O7)4' loop_ _publ_author_name 'Masquelier C' 'd'Yvoire F' 'Rodier N' _journal_name_full 'Acta Crystallographica, Section C' _journal_volume 46 _journal_year 1990 _journal_page_first 1584 _journal_page_last 1587 _publ_section_title ; Structure of the sodium ion conductor Na7Fe3(As2O7)4 ; _database_code_amcsd 0010172 _chemical_formula_sum 'As8 Fe3 Na6.96 O28' _cell_length_a 9.940 _cell_length_b 8.5483 _cell_length_c 28.762 _cell_angle_alpha 90 _cell_angle_beta 93.683 _cell_angle_gamma 90 _cell_volume 2438.863 _exptl_crystal_density_diffrn 3.745 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv As1 0.29984 0.29537 0.24664 1.00000 0.00841 As2 0.21985 0.16184 0.33893 1.00000 0.00828 As3 0.51105 0.66258 0.44285 1.00000 0.00648 As4 0.41229 0.79584 0.53617 1.00000 0.00602 Fe1 0.00000 0.12020 0.25000 1.00000 0.00735 Fe2 0.31751 0.97710 0.43648 1.00000 0.00671 Na1 0.27830 0.38080 0.44570 1.00000 0.02026 Na2 0.52110 0.35770 0.35610 0.88000 0.03546 Na2* 0.47500 0.38400 0.34470 0.16000 0.02533 Na3 0.50000 0.01680 0.25000 0.60000 0.03673 Na3* 0.52500 0.96100 0.30940 0.20000 0.03040 Na4 0.29570 0.60310 0.34610 0.63000 0.04939 Na4* 0.33900 0.71900 0.35100 0.31000 0.04559 O1 0.37420 0.22140 0.20190 1.00000 0.01621 O2 0.36230 0.46380 0.26850 1.00000 0.01406 O3 0.13130 0.29940 0.23850 1.00000 0.01203 O4 0.32940 0.15980 0.29260 1.00000 0.01153 O5 0.06320 0.11990 0.31720 1.00000 0.01469 O6 0.23710 0.33550 0.36260 1.00000 0.02102 O7 0.27510 0.00410 0.36900 1.00000 0.01583 O8 0.47720 0.84620 0.42540 1.00000 0.01279 O9 0.67680 0.63820 0.45320 1.00000 0.01039 O10 0.43530 0.52920 0.41000 1.00000 0.01279 O11 0.44630 0.64510 0.49820 1.00000 0.01127 O12 0.34250 0.94500 0.50560 1.00000 0.01001 O13 0.55930 0.83640 0.56420 1.00000 0.01216 O14 0.30860 0.71410 0.57220 1.00000 0.01039