Abstract
The characterization of three commercial powders of niobium(V) oxide received from two producers was made. The thermal behavior of Nb2O5 up to melting point and its microstructure were studied using X-ray powder diffraction, thermoanalytical methods (DSC/TG), infrared spectroscopy (IR) and scanning microscopy. Analysis of the obtained results revealed that the starting structure of niobium(V) oxide and its thermal behavior depend on the origin of niobia. Depending on the origin of the powder and of its thermal treatment, three polymorphs of Nb2O5 can be observed. Sintering of powders above 1200 °C results in the formation of single phase, H-Nb2O5.
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