data_1001185 _chemical_name_systematic 'Tin(IV) tantalate' _chemical_formula_structural 'Sn.25 Ta1 O3' _chemical_formula_sum 'O3 Sn.25 Ta' _publ_section_title ; Contribution a l'etude de quelques oxydes doubles que forme le tantale avec l'etain, l'uranium et le calcium. ; _publ_author_name 'Gasperin, M' _journal_name_full ; Bulletin de la Societe Francaise de Mineralogie et de Cristallographie (72,1949-100,1977) ; _journal_coden_ASTM BUFCAE _journal_volume 83 _journal_year 1960 _journal_page_first 1 _journal_page_last 21 _cell_length_a 3.88 _cell_length_b 3.88 _cell_length_c 3.88 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 58.4 _cell_formula_units_Z 1 _symmetry_space_group_name_H-M 'P m -3 m' _symmetry_Int_Tables_number 221 _symmetry_cell_setting cubic loop_ _symmetry_equiv_pos_as_xyz 'x,y,z' 'y,z,x' 'z,x,y' 'x,z,y' 'y,x,z' 'z,y,x' 'x,-y,-z' 'y,-z,-x' 'z,-x,-y' 'x,-z,-y' 'y,-x,-z' 'z,-y,-x' '-x,y,-z' '-y,z,-x' '-z,x,-y' '-x,z,-y' '-y,x,-z' '-z,y,-x' '-x,-y,z' '-y,-z,x' '-z,-x,y' '-x,-z,y' '-y,-x,z' '-z,-y,x' '-x,-y,-z' '-y,-z,-x' '-z,-x,-y' '-x,-z,-y' '-y,-x,-z' '-z,-y,-x' '-x,y,z' '-y,z,x' '-z,x,y' '-x,z,y' '-y,x,z' '-z,y,x' 'x,-y,z' 'y,-z,x' 'z,-x,y' 'x,-z,y' 'y,-x,z' 'z,-y,x' 'x,y,-z' 'y,z,-x' 'z,x,-y' 'x,z,-y' 'y,x,-z' 'z,y,-x' loop_ _atom_type_symbol _atom_type_oxidation_number O2- -2.000 Sn4+ 4.000 Ta5+ 5.000 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 O1 O2- 3 c 0. 0.5 0.5 1. 0 d Sn1 Sn4+ 1 a 0. 0. 0. 0.25 0 d Ta1 Ta5+ 1 b 0.5 0.5 0.5 1. 0 d