data_global _chemical_name_mineral 'Lueshite' loop_ _publ_author_name 'Mishchuk D O' 'V'yunov O I' 'Ovchar O V' 'Belous A G' _journal_name_full 'Inorganic Materials' _journal_volume 40 _journal_year 2004 _journal_page_first 1324 _journal_page_last 1330 _publ_section_title ; Structural and dielectric properties of solid solutions of sodium niobate in lanthanum and neodymium niobates Note: La2/3-x Na3x Nb2O6 synthesized at 1350 deg C Note: x = .66, Na2Nb2O6 ; _database_code_amcsd 0018679 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Na Nb O3' _cell_length_a 5.5007 _cell_length_b 5.5621 _cell_length_c 15.5373 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 475.371 _exptl_crystal_density_diffrn 4.580 _symmetry_space_group_name_H-M 'P b c m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,1/2+z' '-x,1/2+y,1/2-z' '-x,1/2+y,z' 'x,1/2-y,-z' 'x,y,1/2-z' '-x,-y,1/2+z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Na1 0.22900 0.25000 0.00000 Na2 0.22900 0.21700 0.25000 Nb 0.25310 0.73440 0.12510 O1 0.67800 0.25000 0.00000 O2 0.21300 0.77800 0.25000 O3 0.47700 0.44900 0.15100 O4 0.03500 0.02200 0.11300