data_global _amcsd_formula_title 'Ba Fe16 Mg2 O27' loop_ _publ_author_name 'Collomb A' 'Abdelkader O' 'Wolfers P' 'Guitel J' 'Samaras D' _journal_name_full 'Journal of Magnetism and Magnetic Materials' _journal_volume 58 _journal_year 1986 _journal_page_first 247 _journal_page_last 253 _publ_section_title ; Crystal structure and magnesium location in the W-type hexagonal ferrite: (Ba) Mg2 - W. _cod_database_code 1008764 ; _database_code_amcsd 0016641 _chemical_formula_sum 'Ba Mg1.981 Fe16.019 O27' _cell_length_a 5.9060 _cell_length_b 5.9060 _cell_length_c 32.91499 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 994.286 _exptl_crystal_density_diffrn 5.051 _symmetry_space_group_name_H-M 'P 63/m m c' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-x+y,1/2+z' 'x,x-y,1/2-z' '-x+y,-x,1/2-z' 'x-y,x,1/2+z' '-y,-x,z' 'y,x,-z' 'y,-x+y,-z' '-y,x-y,z' 'x-y,-y,1/2+z' '-x+y,y,1/2-z' 'x,y,1/2-z' '-x,-y,1/2+z' 'x,x-y,z' '-x,-x+y,-z' 'x-y,x,-z' '-x+y,-x,z' 'y,x,1/2+z' '-y,-x,1/2-z' '-y,x-y,1/2-z' 'y,-x+y,1/2+z' '-x+y,y,z' 'x-y,-y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Ba1 0.00000 0.00000 0.25000 1.00000 Mg1 0.33333 0.66667 -0.24470 0.04100 Fe1 0.33333 0.66667 -0.24470 0.45900 Mg2 0.33333 0.66667 -0.42589 0.12000 Fe2 0.33333 0.66667 -0.42589 0.88000 Mg3 0.50000 0.00000 0.00000 0.37900 Fe3 0.50000 0.00000 0.00000 0.62100 Mg4 0.00000 0.00000 0.05573 0.16000 Fe4 0.00000 0.00000 0.05573 0.84000 Mg5 0.33333 0.66667 0.09275 0.10100 Fe5 0.33333 0.66667 0.09275 0.89900 Fe6 0.33333 0.66667 0.20794 1.00000 Fe7 -0.16450 -0.32900 0.15024 1.00000 O1 0.00000 0.00000 0.11284 1.00000 O2 0.33333 0.66667 0.03493 1.00000 O3 0.33333 0.66667 -0.32026 1.00000 O4 0.48520 0.97040 0.25000 1.00000 O5 0.51170 0.02340 0.11041 1.00000 O6 -0.17690 -0.35380 0.03612 1.00000 O7 0.16290 0.32580 0.17928 1.00000