data_global _amcsd_formula_title 'Li2Cu5(Si2O7)2' loop_ _publ_author_name 'Kawamura K' 'Kawahara A' 'Iiyama J T' _journal_name_full 'Acta Crystallographica, Section B' _journal_volume 34 _journal_year 1978 _journal_page_first 3181 _journal_page_last 3185 _publ_section_title ; The crystal structure of Li2Cu5(Si2O7)2 and the proposal of new values for the effective iconic radii of Cu2+ ; _database_code_amcsd 0019770 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Cu5 Si4 Li2 O14' _cell_length_a 7.404 _cell_length_b 7.754 _cell_length_c 5.455 _cell_angle_alpha 90.52 _cell_angle_beta 106.27 _cell_angle_gamma 114.64 _cell_volume 270.400 _exptl_crystal_density_diffrn 4.102 _symmetry_space_group_name_H-M 'P -1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Cu1 0.00000 0.00000 0.00000 Cu2 0.61260 0.18320 0.91840 Cu3 0.42120 0.28770 0.33830 Si1 0.77230 0.13880 0.50210 Si2 0.21480 0.40110 0.79910 Li1 0.11430 0.45130 0.24480 O1 0.22510 0.01750 0.30530 O2 0.65230 0.03870 0.20780 O3 0.66060 0.26150 0.58860 O4 0.18760 0.26380 0.02730 O5 0.01600 0.28340 0.53530 O6 0.82000 0.42150 0.10410 O7 0.41460 0.45270 0.70470 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Cu1 0.00500 0.00390 0.00875 0.00131 0.00157 0.00047 Cu2 0.00620 0.00418 0.00668 0.00099 0.00016 0.00146 Cu3 0.00453 0.00419 0.00931 0.00162 0.00142 0.00114 Si1 0.00475 0.00402 0.00714 0.00197 0.00067 0.00172 Si2 0.00489 0.00408 0.00838 0.00195 0.00085 0.00194 Li1 0.00505 0.00424 0.00768 0.00203 0.00082 0.00194 O1 0.00700 0.00494 0.01059 0.00204 0.00157 0.00085 O2 0.00762 0.00485 0.01034 0.00237 0.00088 0.00252 O3 0.00666 0.00659 0.00928 0.00422 0.00019 0.00283 O4 0.00624 0.00515 0.00915 0.00120 0.00165 0.00037 O5 0.00669 0.00594 0.00947 0.00191 0.00026 0.00231 O6 0.00780 0.00483 0.01138 0.00256 0.00022 0.00282 O7 0.00720 0.00552 0.01287 0.00277 0.00131 0.00441