ELECTROCHEMICAL SYNTHESIS OF TUNGSTEN OXIDE BRONZE POWDERS

Abstract

Chemical analysis established that during electrochemical reduction in M2WO4 — WO3 (M — Li, Na, K, Cs, Tl) melts, tungsten oxide bronzes of various compositions and structures are formed. The dependence of the change in the equilibrium potentials of cathode products on the temperature and composition of the melt has been studied. It was found that with an increase in the content of alkali metal in tungsten melts, the number of crystal nuclei decreases. A decrease in the melt temperature and an increase in the cathode current density also lead to a decrease in the grain size of the cathode deposits, which makes it possible to obtain powders of tungsten oxide bronzes of controlled dispersion.

Keywords

• : oxide tungsten bronze
• powders electrochemical synthesis
• electrolytic reduction
• molten salts