Ba H2 Nb6 O17 Nedjar R, Borel M Materials Research Bulletin 23 (1988) 497-500 Ba (Nb3O8)2 (H2 O): a novel lamellar niobate _cod_database_code 1001419 _database_code_amcsd 0014325 8.62 21.61 3.811 90 90 90 Immm atom x y z Nb1 .186 .368 0 Nb2 .5 .232 0 Ba1 0 0 0 O1 .15 .36 .5 O2 .34 .43 0 O3 .34 .30 0 O4 0 .29 0 O5 0 .43 0 O6 0 .5 .5