data_global _amcsd_formula_title 'Cs4(NbO)2(Si8O21)' loop_ _publ_author_name 'Crosnier M' 'Guyomard D' 'Verbaere A' 'Piffard Y' _journal_name_full 'European Journal of Solid State and Inorganic Chemistry' _journal_volume 27 _journal_year 1990 _journal_page_first 435 _journal_page_last 442 _publ_section_title ; Synthesis and structure of a novel polysilicate Cs4(NbO)2(Si8O21) _cod_database_code 1000287 ; _database_code_amcsd 0012530 _chemical_formula_sum 'Cs4 Nb2 Si8 O23' _cell_length_a 7.016 _cell_length_b 7.840 _cell_length_c 11.066 _cell_angle_alpha 77.16 _cell_angle_beta 89.95 _cell_angle_gamma 72.02 _cell_volume 562.980 _exptl_crystal_density_diffrn 3.864 _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 Cs1 0.20950 0.20960 0.01373 Cs2 0.17500 0.28180 0.36388 Nb1 0.70530 0.25910 0.18545 Si1 0.64880 0.29620 0.50120 Si2 0.43390 0.14040 0.71250 Si3 0.66050 0.33010 0.86930 Si4 0.99450 0.18830 0.70470 O1 0.50000 0.50000 0.50000 O2 0.70000 0.21900 0.00990 O3 0.86200 0.26500 0.57140 O4 0.54500 0.15300 0.58320 O5 0.87200 0.30030 0.80110 O6 0.19400 0.25300 0.67690 O7 0.95200 0.03000 0.24150 O8 0.56200 0.55000 0.85120 O9 0.14600 0.59700 0.84780 O10 0.53300 0.06700 0.21950 O11 0.48200 0.75000 0.20200 O12 0.31700 0.73900 0.63410 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 Cs1 0.01400 0.02250 0.01470 -0.00470 0.00010 0.00280 Cs2 0.01620 0.02300 0.01640 -0.00660 0.00110 -0.00420 Nb1 0.00680 0.00650 0.00660 -0.00270 0.00100 -0.00140 Si1 0.00800 0.00700 0.00800 -0.00170 0.00080 -0.00260 Si2 0.00500 0.01100 0.00700 -0.00290 0.00040 -0.00150 Si3 0.00700 0.01100 0.00800 -0.00290 0.00180 -0.00320 Si4 0.00600 0.00800 0.00800 -0.00090 0.00040 -0.00100