PREPARATION OF NIOBIUM (V) OXIDE WITH CONTROLLED DISPERSITY AND MORPHOLOGY

Abstract

In this work, the effect of the annealing temperature and the chemical history of the precipitate on the morphology and phase composition of the Nb2O5 powder was studied. Nb2O5nH2O precipitate and gel-like niobium citrate were obtained by solution methods. The synthesis of niobium oxide was carried out at temperatures of 600, 1000, and 1200 °C, the synthesis products were analyzed using X-ray diffraction, scanning electron microscopy, X-ray microscopy, and differential thermal and thermogravimetric analysis. Annealing of niobium citrate at a temperature of 600 °C makes it possible to obtain niobium oxide particles with an average size of about 70 nm, which is 4 – 6 times smaller than Nb2O5 obtained from the Nb2O5nH2O precipitate.