data_global _amcsd_formula_title 'NaMgF3' loop_ _publ_author_name 'Martin C D' 'Crichton W A' 'Liu H' 'Prakapenka V' 'Chen J' 'Parise J B' _journal_name_full 'American Mineralogist' _journal_volume 91 _journal_year 2006 _journal_page_first 1703 _journal_page_last 1706 _publ_section_title ; Rietveld structure refinement of perovskite and post-perovskite phases of NaMgF3 (neighborite) at high pressures Sample: (c), P = 54 GPa ; _database_code_amcsd 0004241 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Na Mg F3' _cell_length_a 2.7164 _cell_length_b 8.381 _cell_length_c 6.8487 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 155.919 _exptl_crystal_density_diffrn 4.443 _symmetry_space_group_name_H-M 'C m c m' 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' '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 Na 0.00000 0.24220 0.25000 Mg 0.00000 0.00000 0.00000 F1 0.50000 0.44330 0.25000 F2 0.50000 0.13850 0.05790