Abstract
Nano-crystalline sodium niobate (NaNbO 3) powder was synthesized by the solution combustion synthesis of sodium nitrate (NaNO 3) and Nb 2O 5 using glycine as the fuel. The chemical reaction, nucleation mechanisms and influence of the fuel-to-oxidizer ratio to phase formation were studied. The precursor and product powders were characterized, using thermo gravimetric analysis (TGA), differential thermal analysis (DTA), the X-ray diffraction technique (XRD), scanning electron microscope (SEM) and Fourier transform infrared (FTIR) spectroscopy. As-prepared powder possesses an orthorhombic crystal structure with an X-ray diffraction pattern that could be matched with the perovskite, NaNbO 3 JCPDS no. 82-0606. Perovskite NaNbO 3 phase, with a mean crystalline size (calculated by X-ray line broadening) ranging from 44.51 ± 11.99 nm (ratio of 0.7) to 26.11 ± 13.69 nm (ratio of 2.0) was obtained. The SEM image shows polyhedral-shaped powder with a mean particle size of 137 ± 52 nm and 226 ± 46 nm for as-prepared and calcined powder, respectively.
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