Studies of phase transition and impedance behavior of Ba(Zr, Ti)O3 ceramics

Abstract

Ceramic samples of Barium Zirconium Titanate (BaZrxTi1-xO3 (BZT)) were synthesized by conventional solid-state reaction method with different concentrations of x(= 0.05 (BZT1), 0.10 (BZT2), 0.15 (BZT3), 0.20 (BZT4), 0.25 (BZT5), 0.30 (BZT6)). Phase confirmation of the samples was done by X-ray diffraction (XRD) technique. All the compositions are in cubic structure. XRD pattern was recorded for samples sintered at different sintering temperatures. Lattice parameters increased with addition of Zr+4. Doping with Zr+4 into Barium titanate resulted in interesting changes of electrical properties (dielectric, impedance and ferroelectiricity). The strong influence of Zr doping on the phase transition characteristics of the BZT ceramics was studied from the dielectric response of the samples. Diffusivity of phase transition of the BZT ceramic samples increase with Zr+4 concentration, indicating changes from normal to diffuse transition to relaxor phase transition behavior. Impedance spectroscopy reveals the presence of temperature-dependent grain, grain boundary effects. Polarization–Electricfield (PE) loop measurements are also done on the samples.

Keywords

• Ferroelectric properties
• diffuse phase transition
• impedance spectroscopy