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Notes:

allied

academies

February 25-26, 2019 | Paris, France

Materials Science and Engineering

2

nd

International Conference on

Journal of Materials Science and Nanotechnology | Volume 3

F

erroelectric/antiferroelectric thin/thick films with large

electrocaloric (EC) effect in a broad operational temperature

range are very attractive in solid-state cooling devices. We

demonstrated that a large positive electrocaloric (EC) effect

(maximum ΔT~20.7 K) in a broad temperature range (~110

K) was realized in Pb

0.97

La

0.02

(Zr

0.65

Sn

0.3

Ti

0.05

)O

3

(PLZST) relaxor

antiferroelectric (AFE) thin film prepared using a sol-gel method.

The large positive EC effect may be ascribed to the in-plane

residual thermal tensile stress during the layer-by-layer annealing

process,andthehigh-qualityfilmstructureowingtotheutilization

of the LaNiO

3

/Pt composite bottom electrode. The broad EC

temperature rangemay be ascribed to the great dielectric relaxor

dispersion around the dielectric peak because of the coexistence

of nanoscale multiple FE and AFE phases. Moreover, a large

pyroelectric energy density (6.10 Jcm

-3

) was harvested by using

an Olsen cycle, which is much larger than those (usually less than

10

-4

Jcm

-3

) obtained by using direct thermal-electrical, Stirling

and Carnot cycles, etc. These breakthroughs enable the PLZST

thin film an attractive multifunctional material for applications in

modern solid-state cooling and energy harvesting.

Speaker Biography

Qi Zhang is an academic staff at Cranfield University and a visiting professor at Wuhan

University of Technology. He joined Cranfield University as a research fellow in 1996

following the completion of a PhD at Monash University in Australia. He is a fellow in

IOM3 and has sat on the EPSRC Peer Review College since 2006. He became a Senior

Research Fellow in 1998 and then Senior Lecturer in 2007. He is currently supervising

PhD students from the UK, EU, China, Iraq and Thailand. He has a strong background

in ferroelectric thin and thick films and their applications in ferroelectric memory,

pyroelectric and electrocaloric effect in the synthesis of nanofunctional materials

and their applications in ink-jet printing, surface modifications and nanomaterials for

energy storage, etc.

e:

q.zhang@cranfield.ac.uk

Qi Zhang

Biaolin Peng

Cranfield University, UK

Thermal strain induced large electrocaloric effect of relaxor thin film on LaNiO

3

/

Pt composite electrode with the coexistence of nanoscale antiferroelectric and

ferroelectric phases in a broad temperature range