Synthesis of BaTi 2O 5 powders by stearic acid gel method

Abstract

BaTi 2O 5 was successfully synthesized by a stearic acid gel method. The as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectrometry, UV/vis diffuse reflectance spectra and thermal gravimetric analysis, respectively. The present results show that the calcined process of stearic acid gel consists of a series of oxidation and combustion reactions in air. The formation of BaTi 2O 5 phase starts at around 600 °C and continues up to 1100 °C in our designed experiments. Some contaminated phases such as BaTiO 3, BaCO 3 and TiO 2 can coexist with BaTi 2O 5 phase at low calcined temperature, and then dramatically decrease with increasing the calcination temperature. SEM and TEM images of BaTi 2O 5 powders prepared at 900 °C show that BaTi 2O 5 powders are around 200 nm in size, and irregular in shape with slight agglomeration. Fourier transform infrared spectra and UV/vis diffuse reflectance spectra can well confirm the observed XRD results.