(School of Chemistry and Materials Science, Liaoning University of Petroleum & Chemical Technology, Fushun 113001)

Abstract:The precursor was obtained by grinding sodium oxalate and tantalum hydroxide in small amount of water and drying.The precursor was analyzed by thermogravimetric (TG) analysis. NaTaO₃ single-phase powder was obtained by calcining the precursor at 500 ℃, 600 ℃, 700 ℃ and 800 ℃ for 3 hours. They were all characterized by x-ray diffraction, scanning electron microscopy (SEM) and FTIR. The size of the particles calcined at 500 ℃ is 43 nm calculated by XRD analysis. The SEM determination shows that the size of the particles calcined at 500 ℃ is less than 100 nm. The characteristic absorption at 615cm is assigned to Ta-O band in FT-IR spectra. The energy gap of NaTaO₃ calculated by UV-Vis is 3.96eV.

Keywords: NaTaO₃ powder, tantalum hydroxide, sodium oxalate, precursor