INFLUENCE OF DEPOSITION CONDITIONS DURING PRECIPITATION OF NH4VO3 WITH DIETHYL SULPHATE
Aksu SAMET, Zulxhevat ABDIJA
Abstract
The vanadium(V) oxide xerogels are synthesized by chemical bath deposition using aqueous solutions of NH4VO3 and diethyl sulfate. XRD and IR have been used for the characterization of the composition of the prepared precipitates. The concentration, temperature, and precipitation speed influence were analyzed. A large number of experiments have been made with the powders obtained at different ammonium metavanadate concentrations solutions, with the same volume of diethyl sulfate, at two working temperatures, 80 and 90 °C. The obtained results showed that at higher concentrations of ammonium metavanadate, as well as at higher temperatures, faster precipitation occurs. According to XRD and IR results synthesized precipitates are pure V2O5 xerogels, but at higher concentrations of the solutions, the second phase is obtained. Also, the influence of ethyl alcohol on the composition and time of precipitation of the synthesized precipitates was investigated in the metavanadate system with different concentrations of ammonium metavanadate and diethyl sulfate. It was found that the presence of alcohol in the chemical bath does not affect the composition of the xerogel at higher concentrations, but it influences the speed of the precipitation. The results of precipitates prepared at lower concentrations with ethanol showed the presence of a second phase in the composition, which cannot be seen in the composition of the sample prepared without ethanol at the same concentration of ammonium metavanadate.
Pages:
99 - 106