Synthesis and characterization of Na0.5Bi4.5Ti4O15 powders by stearic acid gel method 

By S. Supriya, S. Kalainathan and S. Swaroop 


The Aurivillius family compound of sodium bismuth titanate, Na0.5Bi4.5Ti4O15 (NBT) was prepared for the first time by stearic acid gel method.  The NBT powders were sintered at 1200 °C for 1 hr.  The phase confirmation of compound was done by using XRD. Microstructure of sintered sample was analyzed using scanning electron microscope (SEM).  Fourier transform infrared spectroscopy (FTIR) showed compound confirmation peaks of sodium bismuth titanate sample.  From FTIR the band at 661.29 cm-1 shows formation of presence of large amount of NBT compound.  Finally, thermal analysis of NBT was done by thermo gravimetric analysis, differential thermal analysis and differential scanning calorimetry.  The temperature of sol gel reaction and the ending process of crystallization were analyzed by differential thermal analysis (DTA).  The combustion, decomposition and weight loss temperature ranges were identified by using thermo gravimetric analysis (TGA).  From the differential scanning calorimetry (DSC) the heat flow ranges has been observed. 

Key words:  Ceramics; X-ray diffraction; thermal analysis.

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