Dielectric relaxation and ac conduction in multiferroic Bi0.8Gd0.1Pb0.1Fe0.9Ti0.1O3 ceramics: impedance spectroscopy analysis. (1st December 2016)

• Record Type: Journal Article
• Authors: Thakur, Shweta; Rai, Radheshyam; Bdikin, Igor; Rai, Shashi Prakash
• Is Part Of: Phase transitions. Volume 89:Number 12(2016)
• Page Start: 1213
• Page End: 1224
• Publication Date: 2016-12-01
• Subjects: X-ray diffraction -- dielectric properties -- electrical properties -- lattice Strain -- impedance spectroscopy; Phase transformations (Statistical physics) -- Periodicals; 530.47405
• DOI: 10.1080/01411594.2016.1160399
• Languages: English
• ISSNs: 0141-1594

Abstract

ABSTRACT: The solid solutions of Bi0.8 Gd0.1 Pb0.1 Fe0.9 Ti0.1 O3 have been prepared by the solid-state reaction method. The preliminary structural studies were carried out by X-ray diffraction technique showing the formation of polycrystalline sample with ABO3 type of perovskite structure with hexagonal symmetry for the Bi0.8 Gd0.1 Pb0.1 Fe0.9 Ti0.1 O3 ceramic system at room temperature. Dielectric properties and impedance study of this ceramic have been characterized in the temperature range room temperature to 375 °C and frequency range 100 Hz–1 MHz. The maximum ferroelectric transition temperature ( Tc ) of this system was in the range 200 °C–260 °C with the dielectric constant of peak to be ∼30, 170 at 1 kHz. The complex impedance plot exhibited one impedance semicircle observed at low temperature, whereas two semicircles above 80 °C and the centres of the semicircles lie below the real axis, which indicates that the material is non-Debye type. Single semicircle is explained by the grain effect of the bulk and double semicircle is due to the bulk and grain boundary effect. The bulk resistance and grain boundary resistance of the materials decrease with the increasing temperature, showing negative temperature and a typical semiconducting property, i.e. negative temperature coefficient of resistance behaviour.