Low- Frequency Dielectric Dispersion and Impedance Spectroscopy of Lead-Free Na0.5 Bi0.5 Tio3 (NBT) based Ferroelectric CeramicB.Tilak*
Department of Materials Science, Addis Ababa University, Addis Ababa, Ethiopia
- *Corresponding Author:
Department of Materials Science
Addis Ababa University
Addis Ababa, Ethiopia
E-mail: [email protected]
Received Date: March 28, 2012; Accepted Date: April 18, 2012; Published Date: April 25, 2012
Citation: Tilak B (2012) Low- Frequency Dielectric Dispersion and Impedance Spectroscopy of Lead-Free Na0.5 Bi0.5 Tio3 (Nbt) based Ferroelectric Ceramic. J Material Sci Eng 1:108. doi: 10.4172/2169-0022.1000108
Copyright: © 2012 Tilak B. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
(Na0.5Bi0.5)0.89Ba0.11 Zr0.04Ti0.96O3 (0.11BNBZT) ceramic were prepared by using solid-state reaction method. A single phase perovskite (ABO3) structure with tetragonal symmetry was confirmed by X-ray diffraction. The dielectric behavior, impedance relaxation were investigated in a wide range of temperature (30°C-600°C) and frequencies (45Hz-5MHz). The grain morphologies were analyzed by using a Scanning Electron Microscopy (SEM) analysis. The temperature dependence of dielectric behavior and the frequency dependence of impedance relaxation were investigated. A broaden dielectric constant peak were observed over a wide temperature range and also indicate a relaxor behavior. The complex impedance plot exhibited semicircle plot, which is explained by the grain effect of the bulk. The center of the impedance semicircles lie below the real axis, which indicates that the impedance response is a Cole-Cole type relaxation.