Imperial College London
Alternate

ProfessorNeilAlford

Faculty of Engineering, Department of Materials

Professor of Materials
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Ms Karen Murphy +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Le:2015:10.1063/1.4934759,
author = {Le, Goupil F and Bennett, J and Axelsson, A-K and Valant, M and Berenov, A and Bell, AJ and Comyn, TP and Alford, NM},
doi = {10.1063/1.4934759},
journal = {Applied Physics Letters},
title = {Electrocaloric enhancement near the morphotropic phase boundary in lead-free NBT-KBT ceramics},
url = {http://dx.doi.org/10.1063/1.4934759},
volume = {107},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The electrocaloric effects (ECEs) of the morphotropic phase boundary (MPB) composition 0.82(Na0.5Bi0.5)TiO3-0.18(K0.5Bi0.5)TiO3 (NBT-18KBT) are studied by direct measurements. The maximum ECE ΔTmax = 0.73 K is measured at 160 °C under 22 kV/cm. This corresponds to an ECE responsivity (ΔT/ΔE) of 0.33 × 10−6 K m/V, which is comparable with the best reported values for lead-free ceramics. A comparison between the direct and indirect ECE measurements shows significant discrepancies. The direct measurement of both positive and negative electrocaloric effect confirms the presence of numerous polar phases near the MPB of NBT-based materials and highlights their potential for solid-state cooling based on high field-induced entropy changes.
AU  - Le,Goupil F
AU  - Bennett,J
AU  - Axelsson,A-K
AU  - Valant,M
AU  - Berenov,A
AU  - Bell,AJ
AU  - Comyn,TP
AU  - Alford,NM
DO  - 10.1063/1.4934759
PY  - 2015///
SN  - 1077-3118
TI  - Electrocaloric enhancement near the morphotropic phase boundary in lead-free NBT-KBT ceramics
T2  - Applied Physics Letters
UR  - http://dx.doi.org/10.1063/1.4934759
UR  - http://hdl.handle.net/10044/1/31336
VL  - 107
ER  -
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