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Abnormal piezoelectric and dielectric behavior of 0.92Na0.5Bi0.5TiO3-0.08BaTiO3 induced by La doping

Published online by Cambridge University Press:  03 March 2011

Liying Liu ,
Mankang Zhu ,
Yudong Hou ,
Hui Yan  and
Riping Liu
Liying Liu*
Affiliation:
Key Laboratory of Metastable Materials of Science and Engineering, Yanshan University, Qinhuangdao 066004, China
Mankang Zhu
Affiliation:
Laboratory of Thin Film Materials, College of Beijing University of Materials of Science and Engineering, Beijing University of Technology, Beijing 100022, China
Yudong Hou
Affiliation:
Laboratory of Thin Film Materials, College of Beijing University of Materials of Science and Engineering, Beijing University of Technology, Beijing 100022, China
Hui Yan
Affiliation:
Laboratory of Thin Film Materials, College of Beijing University of Materials of Science and Engineering, Beijing University of Technology, Beijing 100022, China
Riping Liu
Affiliation:
Key Laboratory of Metastable Materials of Science and Engineering, Yanshan University, Qinhuangdao 066004, China
*
a) Address all correspondence to this author. e-mail: liuliying@ysu.edu.cn
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Abstract

Properties and phase structures of lead-free piezoelectric ceramics 0.92Na0.5Bi0.5TiO3-0.08BaTiO3 (NBT-BT) modified with La2O3 have been studied. Because of the different valence and ionic radius between La3+ and the exchangeable A-site ions, the lattice distortion and arrangement in the modified compounds can be expected, which will directly influence the phase composition and electrical characteristics of NBT-BT. Differing from familiar frame of gradual variability going with adulteration, NBT-BT doping 0.2–1.0 at.% La2O3 presents an abnormal increase of dielectric constant and a dramatic vanish of piezoelectricity. Further study on the relaxor property and domain structure implies that it originates from a typical relaxor-to-antiferroelectric crossover phase transition. However, a larger addition of La2O3 could rejuvenate the ferroelectricity and piezoelectricity of NBT-BT, correlating well with the model of competing ferro- and antiferroelectric interactions and metastable intermediate phase behavior in the morphotropic phase boundary region of complex perovskites.

Keywords

DopantFerroelectricityPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1188 - 1192
Copyright
Copyright © Materials Research Society 2007

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