A facile synthesis of NaNbO3 powders by decomposition of ammonium niobium oxalate with sodium salt at low temperature

Abstract

A facile synthesis of NaNbO 3 powders was performed by solid-state reaction at low temperature. Stoichiometric ammonium niobium oxalate and Na 2 CO 3 were mixed in water and then calcined at different temperatures for various times after drying. A combination of X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectroscopy and thermogravimetric (TG) analysis was used to characterie the product and precursor compound. The XRD patterns show that single-phase NaNbO 3 powders with high crystallinity can be synthesized at 425°C for 15 min. The particle size from XRD data is found to be about 40 nm for NaNbO 3 powders calcined at 500°C for 3 h, which is in good agreement with SEM data. The SEM photograph shows that NaNbO 3 powders are cuboid-like and well crystallized when calcination at 800°C for 3 h. The product compositions prepared using other sodium reactants, such as HCOONa and NaNO 3 , are also discussed.

Solvothermal synthesis and characterization of nanocrystalline NaNbO₃ and NaTaO₃ powders

“…In general, the electrical and optical properties of dielectric ceramics strongly depend on the microstructure, which is mainly influenced by the powder synthesizing method and sintering process 4,5 tantalite powders are usually synthesized via a solid state reaction, which involves mixing an alkaline hydroxide or carbonate with niobium pentoxide or tantalite petoxide, require high sintering temperatures and long reaction times which sometimes leads to inhomogeneity in composition and stoichiometric variation in the sintered material 6 .…”