Issue 25, 2016

Defect dipole-induced poling characteristics and ferroelectricity of quenched bismuth ferrite-based ceramics

Abstract

Multiferroic bismuth ferrite (BiFeO3, BFO) is one of the most promising high-temperature ferroelectric and piezoelectric materials due to a high Curie temperature (TC ∼ 825 °C) if the enhancement of ferroelectricity and piezoelectricity can be realized. Unfortunately, it is difficult to adequately pole BFO ceramics due to a high coercive field as well as a high leakage current. Here we investigated the defect dipole-induced poling characteristics and the ferroelectric properties of four kinds of A or/and B-doped BFO ceramics (i.e. BiFeO3, Bi0.95Sm0.05FeO3, BiFe0.95Sc0.05O3, and Bi0.95Sm0.05Fe0.95Sc0.05O3) using a modified quenching technique. The piezoelectric effect is determined by the poling condition, and moreover the poling behavior is strongly dependent on the ion substitution types of BFO ceramics. An enhanced piezoelectric property (d33 = 46–51 pC N−1) can be attained without the involvement of a phase boundary. Specifically, the doping with Sm (Bi0.95Sm0.05FeO3) can cause an obvious threshold during poling, and additionally Bi0.95Sm0.05FeO3 and Bi0.95Sm0.05Fe0.95Sc0.05O3 components can be curiously adequately poled below the coercive field at the poling temperature of 100 °C. In addition, the saturated PE loops with an obvious internal bias field (Ei) were observed, where Ei was induced by defect dipoles Image ID:c6tc01629d-t1.gif, and then defect dipoles may be decoupled at 120 °C and 6 kV mm−1 (DC field), resulting in a cyclical poling current. It is of great interest to note that an enhanced remanent polarization (2Pr ∼ 50–60 μC cm−2) of the ceramics is obtained, and especially the internal bias fields can be alleviated by AC-cycling or decreasing the measurement frequency. Finally, we believe that our research will have a significant importance in the improvement of piezoelectricity of BFO-based ceramics.

Graphical abstract: Defect dipole-induced poling characteristics and ferroelectricity of quenched bismuth ferrite-based ceramics

Article information

Article type
Paper
Submitted
21 Apr 2016
Accepted
22 May 2016
First published
23 May 2016

J. Mater. Chem. C, 2016,4, 6140-6151

Defect dipole-induced poling characteristics and ferroelectricity of quenched bismuth ferrite-based ceramics

J. Lv, X. Lou and J. Wu, J. Mater. Chem. C, 2016, 4, 6140 DOI: 10.1039/C6TC01629D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements