>> I didn´t find the crystalline phase
>> K_6 H_2 Nb_6 O_19 .8H_2 O
>> in ICSD database
>
> K7(H Nb6O19).(H2O)10 which is already pretty close,
I should have given the reference for this and other similar Nb6O19
cluster compounds as:
"Solid-state structures and solution behavior of alkali salts of the (Nb6
O19)(8-) Lindqvist ion."
Nyman, M.;Alam, T.M.;Bonhomme, F.;Rodriguez, M.A.;Frazer, C.S.;Welk, M.E.
Journal of Cluster Science (2006) 17, 197-219
If you use Jmol in ICSD to draw these structures you find that they
consist of clusters of 6 Nb-oxide octahedra (Nb6O19) held together with
water hydrogen bonds and K+ or other cations for charge balance.
Alan
______________________________________________
Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE
<alan.he...@neutronoptics.com> +33.476.98.41.68
http://www.NeutronOptics.com/hewat
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