data_global _chemical_name_mineral 'Waimirite-(Y)' loop_ _publ_author_name 'Cheetham A K' 'Norman N' _journal_name_full 'Acta Chemica Scandinavica' _journal_volume A28 _journal_year 1974 _journal_page_first 55 _journal_page_last 60 _publ_section_title ; The structures of yttrium and bismuth trifluorides by neutron diffraction ; _database_code_amcsd 0020020 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Y F3' _cell_length_a 6.3537 _cell_length_b 6.8545 _cell_length_c 4.3953 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 191.422 _exptl_crystal_density_diffrn 5.063 _symmetry_space_group_name_H-M 'P n m a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '1/2-x,1/2+y,1/2+z' '1/2+x,1/2-y,1/2-z' '1/2+x,y,1/2-z' '1/2-x,-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_U_iso_or_equiv Y 0.36730 0.25000 0.05910 0.00469 F1 0.52270 0.25000 0.59100 0.01127 F2 0.16520 0.06430 0.37550 0.00722