Abstract
The correlation between the dielectric properties and the structural characteristics of Ta2O5 (Tantalum Oxide) doped BaTiO3 (Barium Titanate) ceramics were investigated under different sintering conditions in this research. The raw materials of making Tantalum Oxide doped Barium Titanate were Ta2O5 and BaTiO3 powders (particle size =100nm; purity better than 99%).Ta2O5 was doped at two different percentages viz. 0.5 and 1.0 mol%. Microstructure and fracture surface of sintered pellets were examined by a Scanning Electron Microscope (SEM). Dielectric properties were investigated by measuring the dielectric constant (k) as a function of temperature and frequency using an impedance analyzer. The results divulge that dielectric properties and microstructure of BaTiO3 ceramics were significantly influenced by the addition of a small amount of Ta2O5. Percent theoretical density above 90% was achieved in this research for 0.5 and 1.0 mol% Ta2O5 doped BaTiO3. It was observed that the grain size decreased markedly above a doping concentration of 0·5 mol% Ta2O5. Although fine grain size down to 200-300nm was attained, grain sizes in the range of 1-1.8μm showed the most alluring properties. The fine-grain quality and high density of the Ta2O5 doped BaTiO3 ceramic resulted in tenfold increase of dielectric constant. Stable value of dielectric constant, as high as 13000-14000 in the temperature range of 55 to 80°C was found for 1.0 mol% Ta2O5 doped BaTiO3 with corresponding shift of Curie point to ~80°C. Experimental results reveal that incorporation of a proper content of Ta2O5 in BaTiO3 could control the grain growth, shift the Curie temperature and hence significantly improve the dielectric property of the BaTiO3 ceramics.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call