data_global _chemical_name_mineral 'Columbite-(Fe)' loop_ _publ_author_name 'dos Santos C A' 'Zawislak L I' 'Kinast E J' 'Antonietti V' 'da Cunha J B M' _journal_name_full 'Brazilian Journal of Physics' _journal_volume 31 _journal_year 2001 _journal_page_first 616 _journal_page_last 631 _publ_section_title ; Crystal chemistry and structure of the orthorhombic (Fe,Mn)(Ta,Nb)2O6 family of compounds Note: Sample Fe(Ta0.4Nb0.6)2O6 ; _database_code_amcsd 0018629 _chemical_compound_source 'Brazil' _chemical_formula_sum 'Fe (Nb1.2 Ta.8) O6' _cell_length_a 14.2737 _cell_length_b 5.73543 _cell_length_c 5.0554 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 413.864 _exptl_crystal_density_diffrn 6.549 _symmetry_space_group_name_H-M 'P b c n' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '1/2+x,1/2+y,1/2-z' '1/2-x,1/2-y,1/2+z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Fe 0.00000 0.33500 0.25000 1.00000 Nb 0.16180 0.17900 0.74400 0.60000 Ta 0.16180 0.17900 0.74400 0.40000 O1 0.09600 0.11000 0.06000 1.00000 O2 0.41800 0.11000 0.07000 1.00000 O3 0.76500 0.11000 0.08000 1.00000