data_global _chemical_name_mineral 'Maghemite' loop_ _publ_author_name 'Shin HS' _journal_name_full 'Journal of the Korean Ceramic Society' _journal_volume 35 _journal_year 1998 _journal_page_first 1113 _journal_page_last 1119 _publ_section_title ; A study on the structure of maghemite (gamma-Fe2O3) I. Rietveld analysis of powder XRD patterns ; _database_code_amcsd 0020519 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Fe1.966 O2.962' _cell_length_a 8.346 _cell_length_b 8.346 _cell_length_c 25.034 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1743.761 _exptl_crystal_density_diffrn 4.791 _symmetry_space_group_name_H-M 'P 43 21 2' loop_ _space_group_symop_operation_xyz 'x,y,z' 'y,x,-z' '1/2-y,1/2+x,3/4+z' '1/2-x,1/2+y,3/4-z' '-x,-y,1/2+z' '-y,-x,1/2-z' '1/2+y,1/2-x,1/4+z' '1/2+x,1/2-y,1/4-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 Fe1 0.12110 0.12110 0.00000 1.00000 0.00722 Fe2 0.61770 0.61770 0.00000 0.97000 0.01013 Fe3 0.99030 0.74480 0.04010 0.98000 0.00760 Fe4 0.49860 0.24220 0.04270 0.98000 0.00849 Fe5 0.75270 0.49390 0.12420 0.99000 0.01026 Fe6 0.36740 0.86150 0.00280 0.99000 0.00760 Fe7 0.12880 0.38180 0.08230 0.98000 0.01026 Fe8 0.87770 0.11030 0.08570 0.99000 0.01013 Fe9 0.62160 0.86110 0.08600 0.97000 0.01026 O1 0.11140 0.38140 -0.00240 0.99000 0.00747 O2 0.85740 0.12760 -0.00040 0.98000 0.00735 O3 0.62940 0.35740 0.00050 1.00000 0.00747 O4 0.60440 0.85770 0.00430 0.96000 0.00760 O5 0.36460 0.87160 0.07900 1.00000 0.00747 O6 0.61790 0.62910 0.08010 0.99000 0.00760 O7 0.87240 0.87090 0.08320 0.99000 0.00735 O8 0.35100 0.39810 0.08330 1.00000 0.00760 O9 0.88040 0.37700 0.08530 1.00000 0.00747 O10 0.10540 0.15380 0.08530 0.99000 0.00747 O11 0.10880 0.61670 0.08630 1.00000 0.00747 O12 0.63940 0.10900 0.08770 0.95000 0.01013