Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26951
Title: High dielectric tunability, electrostriction strain and electrocaloric strength at a tricritical point of tetragonal, rhombohedral and pseudocubic phases
Authors: Peng, B
Zhang, Q
Li, X
Sun, T
Ke, S
Ye, M
Wang, Y 
Lu, W
Niu, H
Zeng, X
Fan, H
Huang, H 
Issue Date: 2015
Source: Journal of alloys and compounds, 2015, v. 646, p. 597-602
Abstract: A relaxor ferroelectric Pb(Ni1/3Nb2/3)0.5Zr0.15Ti0.35O3 (PNNZT) ceramic was reported, designed upon an idea that the composition is selected to near a tricritical point of tetragonal, rhombohedral and pseudocubic phases. High dielectric tunability of 67%, simultaneously with high electrostriction strain of 0.319% and high electrocaloric strength (ΔT/ΔE) of 32.5 mK cm/kV are achieved, which make it a promising multifunctional material for applications in dielectric tunable, precisely controlled and electric refrigeration devices. This is endowed by the low energy barrier among the transitions of phases and strong relaxor ferroelectric activities around the tricritical point. This work provides a guide for the design of multifunctional ferroelectric materials and can promote the development of other multifunctional ferroic materials.
Keywords: Dielectric tenability
Electrocaloric
Electrostriction
Morphotropic phase boundary
Relaxor
Publisher: Elsevier
Journal: Journal of alloys and compounds 
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2015.05.133
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