K3Nb3B2O12 Choisnet J, Groult D, Raveau B, Gasperin M Acta Crystallographica B33 (1977) 1841-1845 Nouvelles structures a tunnels de section pentagonale K3Nb3B2O12 et K3Ta3B2O12 _cod_database_code 1001007 _database_code_amcsd 0009592 8.753 8.753 3.966 90 90 120 P31m atom x y z K1 .5964 0 .4989 Nb1 .2463 0 0 O1 .8179 0 -.0076 O2 .2606 0 .4930 O3 .5030 .1854 -.0169 B1 1/3 2/3 -.0188