Title: Study of structural and electrical properties of polycrystalline Pb(Cd_1/3Ti_1/3W_1/3)O₃ tungsten perovskite

Authors: S.K. Parida; R.N.P. Choudhary; P.G.R. Achary

Addresses: Faculty of Engineering and Technology (ITER), Department of Physics, Siksha 'O' Anusandhan, Deemed to be University, Khandagiri Square, Bhubaneswar – 751030, India ' Faculty of Engineering and Technology (ITER), Department of Physics, Siksha 'O' Anusandhan, Deemed to be University, Khandagiri Square, Bhubaneswar – 751030, India ' Faculty of Engineering and Technology (ITER), Department of Chemistry, Siksha 'O' Anusandhan, Deemed to be University, Khandagiri Square, Bhubaneswar – 751030, India

Abstract: The presence of tetragonal distortion and spontaneous polarisation in lead titanate attracts the researchers to modify the titanate perovskites. A modified lead titanate Pb(Cd_1/3W_1/3Ti_1/3)O₃ perovskite is synthesised by a conventional high-temperature solid-state reaction technique. XRD pattern of the sample confirms the cubic crystal structure having space group F-43m. Full proof Rietveld analysis has been used for structural refinement. The presence of FTIR frequency bands corresponding to Ti-O, O-, W-O-W, and CdO stretching confirm that Cd²⁺, W⁶⁺ ions completely substitute the Ti⁺⁴ ions at the B site of the perovskite, as confirmed by the XRD obtained data. As the frequency increases from 1 kHz to 5 MHz, the activation energy (Ea) decreases from 0.767 eV to 0.089 eV. The activation energy and conductivity mechanism in the samples dominated by hopping charge carriers. Both Nyquist and Cole-Cole plots confirm the semiconducting nature of the samples and make the material technologically important.

Keywords: lead titanate; perovskite; activation energy; conductivity mechanism;; Nyquist plot.

DOI: 10.1504/IJMMP.2020.106922

International Journal of Microstructure and Materials Properties, 2020 Vol.15 No.2, pp.107 - 121

Received: 09 Jul 2019
Accepted: 20 Dec 2019
Published online: 27 Apr 2020 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article