data_1010339 _chemical_name_systematic 'Europium oxide' _chemical_formula_structural 'Eu2 O3' _chemical_formula_sum 'Eu2 O3' _publ_section_title ; The crystal structure of the modification C of the sesquioxides of the rare earth metals, and of indium and thallium. ; _publ_author_name 'Zachariasen, W' _journal_name_full 'Norsk Geologisk Tidsskrift' _journal_coden_ASTM NOGTAO _journal_volume 9 _journal_year 1927 _journal_page_first 310 _journal_page_last 316 _cell_length_a 10.84 _cell_length_b 10.84 _cell_length_c 10.84 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1273.8 _cell_formula_units_Z 16 _symmetry_space_group_name_H-M 'I 21 3' _symmetry_Int_Tables_number 199 _symmetry_cell_setting cubic loop_ _symmetry_equiv_pos_as_xyz 'x,y,z' 'y,z,x' 'z,x,y' '1/2+x,1/2-y,-z' '1/2+y,1/2-z,-x' '1/2+z,1/2-x,-y' '-x,1/2+y,1/2-z' '-y,1/2+z,1/2-x' '-z,1/2+x,1/2-y' '1/2-x,-y,1/2+z' '1/2-y,-z,1/2+x' '1/2-z,-x,1/2+y' '1/2+x,1/2+y,1/2+z' '1/2+y,1/2+z,1/2+x' '1/2+z,1/2+x,1/2+y' 'x,-y,1/2-z' 'y,-z,1/2-x' 'z,-x,1/2-y' '1/2-x,y,-z' '1/2-y,z,-x' '1/2-z,x,-y' '-x,1/2-y,z' '-y,1/2-z,x' '-z,1/2-x,y' loop_ _atom_type_symbol _atom_type_oxidation_number Eu3+ 3.000 O2- -2.000 loop_ _atom_site_label _atom_site_type_symbol _atom_site_symmetry_multiplicity _atom_site_Wyckoff_symbol _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_attached_hydrogens _atom_site_calc_flag Eu1 Eu3+ 8 a 0.25 0.25 0.25 1. 0 d Eu2 Eu3+ 12 b 0.021 0. 0.25 1. 0 d Eu3 Eu3+ 12 b 0.542 0. 0.25 1. 0 d O1 O2- 24 c 0.125 0.135 0.395 1. 0 d O2 O2- 24 c 0.1 0.358 0.373 1. 0 d