Biosensors Nanotechnology

Chapter 14

Synthesis, Characterization and Rietveld Studies of Sr-modified PZT Ceramics

Kumar Brajesh¹, A.K. Himanshu² and N.K. Singh^*,1

¹University Department of Physics, V.K.S. University, Ara, Bihar, India

²Variable Energy Cyclotron Centre, Kolkata, India

*Corresponding author: [e-mail]

Abstract

Presented in this chapter is a 6% Sr²⁺ substituted PZT ceramic composition with lead manganese antimony as an additional hardener dopant [Pb_0.94Sr_0.06] [(Mn_1/3Sb_2/3)_0.05 (Zr_0.495Ti_0.505)_0.95]O₃, which is synthesized in perovskite phase by ceramic route. The precursor [Pb_0.94Sr_0.06]CO₃ is prepared by coprecipitation method to ensure homogeneous distribution of Sr²⁺ ions at A-site, while the other columbite precursor MnSb₂O₆ is prepared by conventional solid-state reaction method to prevent the formation of the unwanted pyrochlore phase. The dielectric permittivity and the loss tangent of the sample are measured in a frequency range from 100 Hz to 1 MHz and in a temperature range from 303 K to 773 K. The frequency dependence of the loss peak is found to obey an Arrhenius law with activation energy of 0.09eV. An analysis of the loss factor with frequency is performed by using the scaling behavior of the dielectric loss spectra. The scaling behavior of the dielectric loss spectra shows its temperature-independent nature. The relaxation mechanism is discussed in the framework of conductivity and impedance spectroscopy. The variation of dielectric constant with temperature ...