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Upper limit of the electrocaloric peak in lead-free ferroelectric relaxor ceramics

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Title: Upper limit of the electrocaloric peak in lead-free ferroelectric relaxor ceramics
Authors: Le Goupil, F
Alford, NM
Item Type: Journal Article
Abstract: The electrocaloric effect (ECE) of two compositions (x = 0.06 and 0.07) of (1 − x)(Na0.5Bi0.5)TiO3-xKNbO3 in the vicinity of the morphotropic phase boundary is studied by direct measurements. ΔTmax = 1.5 K is measured at 125 °C under 70 kV/cm for NBT-6KN while ΔTmax = 0.8 K is measured at 75 °C under 55 kV/cm for NBT-7KN. We show that the “shoulder,” TS, in the dielectric permittivity, marks the upper limit of the ECE peak under high applied electric fields. These results imply that the range of temperature with high ECE can be quickly identified for a given composition, which will significantly speed up the process of materials selection for ECE cooling.
Issue Date: 17-May-2016
Date of Acceptance: 29-Apr-2016
URI: http://hdl.handle.net/10044/1/39956
DOI: http://dx.doi.org/10.1063/1.4950790
ISSN: 2166-532X
Publisher: American Institute of Physics
Journal / Book Title: APL Materials
Volume: 4
Issue: 6
Copyright Statement: © 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
NPL Management Limited
Funder's Grant Number: EP/G060940/1
EP/K503733/1
PO no. 411823
Keywords: Science & Technology
Technology
Physical Sciences
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Science & Technology - Other Topics
Materials Science
Physics
STRENGTH
Publication Status: Published
Article Number: 064104
Appears in Collections:Faculty of Natural Sciences