Journal ArticleDOI
Polarization rotation mechanism for ultrahigh electromechanical response in single-crystal piezoelectrics
Huaxiang Fu,Ronald E. Cohen +1 more
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TLDR
It is shown that a large piezoelectric response can be driven by polarization rotation induced by an external electric field, and the computations suggest how to design materials with better performance, and may stimulate further interest in the fundamental theory of dielectric systems in finite electric fields.Abstract:
Piezoelectric materials, which convert mechanical to electrical energy (and vice versa), are crucial in medical imaging, telecommunication and ultrasonic devices. A new generation of single-crystal materials, such as Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) and Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT), exhibit a piezoelectric effect that is ten times larger than conventional ceramics, and may revolutionize these applications. However, the mechanism underlying the ultrahigh performance of these new materials-and consequently the possibilities for further improvements-are not at present clear. Here we report a first-principles study of the ferroelectric perovskite, BaTiO3, which is similar to single-crystal PZN-PT but is a simpler system to analyse. We show that a large piezoelectric response can be driven by polarization rotation induced by an external electric field. Our computations suggest how to design materials with better performance, and may stimulate further interest in the fundamental theory of dielectric systems in finite electric fields.read more
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Journal ArticleDOI
Effects on structure and properties of BCZT lead-free piezoelectric ceramics by rare-earth doping
Jing Shi,Xiaoyu Lu,Jiahu Shao,Bijun Fang,Shuai Zhang,Qingbo Du,Jianning Ding,Xiangyong Zhao,Haosu Luo +8 more
TL;DR: The BCZT-Re ceramics sintered at 1450°C exhibit pure rhombohedral perovskite structure approaching the morphotropic phase boundary (MPB) composition accompanied by different relative density and grain size distribution as mentioned in this paper.
Journal ArticleDOI
Structural transition in unpoled (1-x)PMN-xPT ceramics near the morphotropic boundary
Jingbo Li,GunagHui Rao,Guang-Yao Liu,J. R. Chen,Li Lu,X. N. Jing,S. L. Li,Jingkui Liang,Jingkui Liang +8 more
TL;DR: In this paper, the phase relation and structural transition in (1-x)Pb(Mg1/3Nb2/3)O-3-xPbTiO(3) ceramics for 0.28 <= x <= 0.4 were investigated by high resolution X-ray powder diffraction (HR-XRD), temperature-dependent Xray powder diffusion, and dielectric analysis.
Journal ArticleDOI
Large Electrocaloric Effect in Lead-Free (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 Ceramics Prepared via Citrate Route
TL;DR: The 1 wt % Li-doped (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 (BCZT-Li) ceramics prepared by the citrate method exhibit improved phase purity, densification and electrical properties, which provide prospective possibility to develop high-performance electrocaloric materials.
Journal ArticleDOI
Electric-field-induced structural changes in multilayer piezoelectric actuators during electrical and mechanical loading
TL;DR: In this paper, the effects of electrical and mechanical loading on the behavior of domains and phases in multilayer piezoelectric actuators were studied using in situ high-energy X-ray diffraction (XRD) and macroscopic property measurements.
References
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Principles and Applications of Ferroelectrics and Related Materials
TL;DR: In this paper, the theory of ferroelectricity in terms of soft modes and lattice dynamics is developed and modern techniques of measurement, including X-ray, optic, and neutron scattering, infra-red absorption, and magnetic resonance.
Journal ArticleDOI
Ultrahigh strain and piezoelectric behavior in relaxor based ferroelectric single crystals
Seung Eek Park,Thomas R. Shrout +1 more
TL;DR: In this article, the piezoelectric properties of relaxor based ferroelectric single crystals, such as Pb(Zn1/3Nb2/3)O3 and PbTiO3, were investigated for electromechanical actuators.
Journal ArticleDOI
Theory of polarization of crystalline solids
TL;DR: It is shown that physically $\ensuremath{\Delta}P can be interpreted as a displacement of the center of charge of the Wannier functions.
Journal ArticleDOI
Origin of ferroelectricity in perovskite oxides
TL;DR: In this paper, the authors report results of electronic-structure calculations on two classic examples of ferroelectric perovskites, BaTiO3 and PbTiO2, and demonstrate that hybridization between the titanium 3d states and the oxygen 2p states is essential for ferroelectivity.
Journal ArticleDOI
Macroscopic polarization in crystalline dielectrics : the geometric phase approach
TL;DR: In this paper, King-Smith and Vanderbilt developed a complete theory in which the polarization difference between any two crystal states in a null electric field takes the form of a geometric quantum phase.
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Ultrahigh strain and piezoelectric behavior in relaxor based ferroelectric single crystals
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