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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.ukQi 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