Effect of Bi_3.99Ti_2.97Nb_0.03O₁₂ Addition on Dielectric and Ferroelectric Properties of PZT Ceramics

Abstract

In this study, bismuth niobium titanate Bi_3.99Ti_2.97Nb_0.03O₁₂; BNbT which is known as a bi-layer structured ferroelectric material was added into lead zirconate titanate (Pb(Zr_0.52Ti_0.48)O₃; PZT). The ceramic with formula (1-x)PZT-xBNbT (x = 0.03, 0.05, 0,07, 0.15 and 0.20) were prepared by a solid state mixed oxide method. Phase analysis using XRD indicated that the pattern of the ceramic showed the single phase tetragonal of PZT, however, a BNbT peak appeared as BNbT content (x = 0.20) was increased. The microstructure of ceramic x = 0.03–0.15 had an equiaxed grain. With the addition of BNbT up to 0.20BNbT, the SEM micrographs also showed that plate-shaped grains started to dominate. The 0.97PZT–0.03BNbT ceramic showed the maximum dielectric constant (ϵ_r ∼ 679). With increasing amount of BNbT content, the dielectric constant and dielectric loss tangent gradually decreased. An addition, small amounts of BNbT content could improve normalized polarization (P_r ∼ 14.97 µC/cm²) of the ceramic.

Keywords:

• Doped-bismuth titanate
• dielectric properties
• ferroelectric properties
• PZT-BNbT

Acknowledgments

NT would like to thank Pibulsongkram Rajabhat University (PSRU).

Funding

This work financially supported by the Pibulsongkram Rajabhat University, the Faculty of Science and Technology of Pibulsongkram Rajabhat University and the National Research Council of Thailand (NRCT).