data_global _chemical_name_mineral 'Neighborite' loop_ _publ_author_name 'Mitchell R H' 'Alexander M' 'Cranswick L M D' 'Swainson I P' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 34 _journal_year 2007 _journal_page_first 705 _journal_page_last 712 _publ_section_title ; A powder neutron diffraction study of the crystal structure of the fluoroperovskite NaMgF3 (neighborite) from 300 to 3.6 K Sample: T = 3.6 K ; _database_code_amcsd 0009125 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Na Mg F3' _cell_length_a 5.3287 _cell_length_b 5.4811 _cell_length_c 7.6335 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 222.953 _exptl_crystal_density_diffrn 3.107 _symmetry_space_group_name_H-M 'P b n m' 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,1/2+z' '1/2-x,1/2+y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Na 0.98610 0.04880 0.25000 Mg 0.00000 0.50000 0.00000 F1 0.09330 0.46990 0.25000 F2 0.70060 0.29560 0.04830