data_global _amcsd_formula_title 'Sr2.83Ta5O15' loop_ _publ_author_name 'Siegrist T' 'Cava R J' 'Krajewski J J' _journal_name_full 'Materials Research Bulletin' _journal_volume 32 _journal_year 1997 _journal_page_first 881 _journal_page_last 887 _publ_section_title ; Reduced alkaline earth tantalates ; _database_code_amcsd 0014380 _chemical_formula_sum 'Sr2.83 Ta5 O15' _cell_length_a 12.282 _cell_length_b 12.282 _cell_length_c 3.864 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 582.875 _exptl_crystal_density_diffrn 7.935 _symmetry_space_group_name_H-M 'P 4/m b m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2-y,1/2-x,z' '1/2+y,1/2+x,-z' 'y,-x,-z' '-y,x,z' '1/2+x,1/2-y,z' '1/2-x,1/2+y,-z' 'x,y,-z' '-x,-y,z' '1/2+y,1/2+x,z' '1/2-y,1/2-x,-z' '-y,x,-z' 'y,-x,z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Sr1 0.00000 0.00000 0.00000 0.83000 0.04179 Sr2 0.17440 0.67440 0.00000 1.00000 0.07346 Ta1 0.00000 0.50000 0.50000 1.00000 0.01976 Ta2 0.07659 0.21119 0.50000 1.00000 0.01950 O1 0.00000 0.50000 0.00000 1.00000 0.12665 O2 0.27600 0.77600 0.50000 1.00000 0.03420 O3 0.07800 0.20800 0.00000 1.00000 0.05319 O4 0.33800 0.01100 0.50000 1.00000 0.03166 O5 0.14000 0.06600 0.50000 1.00000 0.04433