Electrochemical insertion of ions in monoclinic tungsten(VI) oxide from aqu
eous solutions was investigated at room temperature. The solutions were nit
ric acid and solutions of Group I and II nitrates. In all the performed ins
ertions, except with lithium nitrate, the obtained intercalates had the com
position HxWO3 (0.07 <x <0.84). Within this compositional range two types o
f hydrogen intercalated materials were obtained, both with tetragonal symme
try. For low degrees of insertion (0.07 <x <0.17) the lattice constants wer
e a=b=5.225(2) and c=3.884(4) Angstrom. For high degrees of insertion (0.50
<x <0.84) the lattice constants were a=b=5.358(2) and c=3.749(5) Angstrom.
With lithium nitrate as electrolyte solution intercalates with composition
LixWO3 were obtained. After exposure to air the lithium intercalated compo
unds were tetragonal with lattice constants a=b=5.1996(2) and c=3.8402(1) A
ngstrom. The processes where barium nitrate was used as electrolyte were st
udied in detail, and the electrochemical processes were determined. The int
ercalates were characterized using X-ray powder diffraction, and Rietveld r
efinements of the structures of H0.12WO3 and LixWO3 were performed.